Document and Company Information (USD $)	6 Months Ended
Document and Company Information (USD $)	Feb. 13, 2010	Mar. 15, 2010	Feb. 14, 2009
Document and Company Information [Abstract]
Entity Registrant Name	AUTOZONE INC
Entity Central Index Key	0000866787
Document Type	10-Q
Document Period End Date	Feb. 13, 2010
Amendment Flag	false
Document Fiscal Year Focus	2010
Document Fiscal Period Focus	Q2
Current Fiscal Year End Date	--08-29
Entity Well-known Seasoned Issuer	Yes
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Public Float			$ 7,449,415,374
Entity Common Stock, Shares Outstanding		48,759,768

Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	Feb. 13, 2010	Aug. 29, 2009
Current assets:
Cash and cash equivalents	$ 105,161	$ 92,706
Accounts receivable	147,466	126,514
Merchandise inventories	2,261,528	2,207,497
Other current assets	134,558	135,013
Total current assets	2,648,713	2,561,730
Property and equipment:
Property and equipment	3,901,843	3,809,414
Less: Accumulated depreciation and amortization	1,518,700	1,455,057
Property and equipment, net	2,383,143	2,354,357
Other assets:
Goodwill, net of accumulated amortization	302,645	302,645
Deferred income taxes	50,746	59,067
Other long-term assets	39,745	40,606
Other noncurrent assets total	393,136	402,318
Total assets	5,424,992	5,318,405
Current liabilities:
Accounts payable	2,144,995	2,118,746
Accrued expenses and other current liabilities	367,059	381,271
Income taxes payable	72,774	35,145
Deferred income taxes	164,496	171,590
Total current liabilities	2,749,324	2,706,752
Debt	2,774,700	2,726,900
Other liabilities	322,639	317,827
Stockholders' equity (deficit)	(421,671)	(433,074)
Liabilities and stockholders' equity	$ 5,424,992	$ 5,318,405

Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Feb. 13, 2010	Feb. 14, 2009	Feb. 13, 2010	Feb. 14, 2009
Condensed Consolidated Statements of Income (Unaudited) [Abstract]
Net sales	$ 1,506,225	$ 1,447,877	$ 3,095,469	$ 2,926,169
Cost of sales, including warehouse and delivery expenses	752,489	728,579	1,541,809	1,465,681
Gross profit	753,736	719,298	1,553,660	1,460,488
Operating, selling, general and administrative expenses	523,355	504,602	1,062,850	1,007,254
Operating profit	230,381	214,696	490,810	453,234
Interest expense, net	36,309	31,907	72,650	63,072
Income before income taxes	194,072	182,789	418,160	390,162
Income taxes	70,739	66,925	151,527	142,927
Net income	$ 123,333	$ 115,864	$ 266,633	$ 247,235
Weighted average shares for basic earnings per share	49,436	56,517	49,775	57,421
Effect of dilutive stock equivalents	750	648	730	619
Adjusted weighted average shares for diluted earnings per share	50,186	57,165	50,505	58,040
Basic earnings per share	$ 2.49	$ 2.05	$ 5.36	$ 4.31
Diluted earnings per share	$ 2.46	$ 2.03	$ 5.28	$ 4.26

Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Feb. 13, 2010	Feb. 14, 2009
Cash flows from operating activities:
Net income	$ 266,633	$ 247,235
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	87,099	81,964
Amortization of debt origination fees	2,999	1,240
Income tax benefit from exercise of stock options	(7,061)	(4,053)
Deferred income taxes	(2,145)	11,724
Share-based compensation expense	8,867	9,307
Changes in operating assets and liabilities:
Accounts receivable	(20,849)	(55,601)
Merchandise inventories	(52,560)	(58,021)
Accounts payable and accrued expenses	9,965	(49,207)
Income taxes payable	46,532	(35,380)
Other, net	9,428	(914)
Net cash provided by operating activities	348,908	148,294
Cash flows from investing activities:
Capital expenditures	(111,128)	(98,146)
Purchase of marketable securities	(10,467)	(14,520)
Proceeds from sale of marketable securities	8,015	12,164
Disposal of capital assets and other, net	4,231	6,925
Net cash used in investing activities	(109,349)	(93,577)
Cash flows from financing activities:
Net proceeds from commercial paper	47,800	441,455
Repayment of debt		(700)
Net proceeds from sale of common stock	18,726	23,666
Purchase of treasury stock	(291,888)	(647,166)
Income tax benefit from exercise of stock options	7,061	4,053
Payments of capital lease obligations	(9,084)	(8,126)
Other, net		534
Net cash used in financing activities	(227,385)	(186,284)
Effect of exchange rate changes on cash	281	(2,921)
Net increase (decrease) in cash and cash equivalents	12,455	(134,488)
Cash and cash equivalents at beginning of period	92,706	242,461
Cash and cash equivalents at end of period	$ 105,161	$ 107,973

General	6 Months Ended
General	Feb. 13, 2010
General [Abstract]
General	Note A — General The accompanying unaudited condensed consolidated financial statements have been prepared in accordance with U.S. generally accepted accounting principles for interim financial information and with instructions to Form 10-Q and Article 10 of Regulation S-X. Accordingly, they do not include all of the information and footnotes required by U.S. generally accepted accounting principles for complete financial statements. In the opinion of management, all adjustments, including normal recurring accruals, considered necessary for a fair presentation have been included. For further information, refer to the consolidated financial statements and footnotes included in the Annual Report to Stockholders for AutoZone, Inc. (“AutoZone” or the “Company”) for the year ended August 29, 2009 (the “2009 Annual Report to Stockholders”). Operating results for the twelve and twenty-four weeks ended February 13, 2010, are not necessarily indicative of the results that may be expected for the fiscal year ending August 28, 2010. Each of the first three quarters of AutoZone’s fiscal year consists of 12 weeks, and the fourth quarter consists of 16 or 17 weeks. The fourth quarter for fiscal 2009 had 16 weeks and fiscal 2010 will also have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring in the spring and summer months during the first, third and fourth quarters and the lowest sales generally occurring in the winter months during the second quarter. Recent Accounting Pronouncements: In June 2009, the Financial Accounting Standards Board (“FASB”) voted to approve the FASB Accounting Standards Codification (“ASC”) as the single source of authoritative nongovernmental U.S. generally accepted accounting principles. The ASC became effective for the Company commencing with the Company’s fiscal quarter beginning August 30, 2009. The ASC does not change U.S. generally accepted accounting principles, but combines all authoritative standards such as those issued by the FASB, the American Institute of Certified Public Accountants and the Emerging Issues Task Force into a comprehensive, topically organized online database. On August 31, 2008, the Company adopted ASC 820 (formerly FASB Statement No. 157, “Fair Value Measurements”). This standard defines fair value, establishes a framework for measuring fair value in generally accepted accounting principles, and expands disclosures about fair value measurements. On August 30, 2009, the Company implemented the previously deferred provisions of ASC 820 for nonfinancial assets and liabilities recorded at fair value, as required. The adoption of this statement did not have a material impact on the consolidated financial statements. In December 2007, the FASB issued ASC 805 (formerly FASB Statement 141R, “Business Combinations”). This standard significantly changes the accounting for and reporting of business combinations in consolidated financial statements. Among other things, ASC 805 requires the acquiring entity in a business combination to recognize the full fair value of assets acquired and liabilities assumed at the acquisition date and requires the expensing of most transaction and restructuring costs. The Company adopted this standard effective August 30, 2009, and it is applicable only to transactions occurring after the effective date, of which there have been none as of the date of the consolidated financial statements. In April 2009, the FASB issued ASC 825-10-65-1 (formerly FASB Staff Position No. 107-1 and Accounting Principles Board Opinion No. 28-1, “Interim Disclosures about Fair Value of Financial Instruments”), amending the disclosure requirements in ASC 825. ASC 825 now requires disclosures about the fair value of financial instruments for interim reporting periods in addition to annual reporting periods. The Company adopted these disclosures commencing with the fiscal quarter beginning August 30, 2009. In May 2009, the FASB issued ASC 855 (formerly FASB Statement No. 165, “Subsequent Events”), which establishes general standards of accounting for and disclosures of events that occur after the balance sheet date but before financial statements are issued or are available to be issued. Specifically, ASC 855 sets forth the period after the balance sheet date during which management of a reporting entity should evaluate events or transactions that may occur for potential recognition or disclosure in the financial statements, the circumstances under which an entity should recognize events or transactions occurring after the balance sheet date in its financial statements, and the disclosures that an entity should make about events or transactions that occurred after the balance sheet date. The Company adopted ASC 855 on August 29, 2009.

- Definition

Description containing the entire organization, consolidation and basis of presentation of financial statements disclosure. May be provided in more than one note to the financial statements, as long as users are provided with an understanding of (1) the significant judgments and assumptions made by an enterprise in determining whether it must consolidate a VIE and/or disclose information about its involvement with a VIE, (2) the nature of restrictions on a consolidated VIE's assets reported by an enterprise in its statement of financial position, including the carrying amounts of such assets, (3) the nature of, and changes in, the risks associated with an enterprise's involvement with the VIE, and (4) how an enterprise's involvement with the VIE affects the enterprise's financial position, financial performance, and cash flows. Describes procedure if disclosures are provided in more than one note to the financial statements.

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Share-Based Payments

6 Months Ended

Feb. 13, 2010

Share-Based Payments [Abstract]

Share-Based Payments

Note B — Share-Based Payments

AutoZone recognizes compensation expense for share-based payments based on the fair value of the awards at the grant date. Share-based payments include stock option grants and the discount on shares sold to employees under share purchase plans. Additionally, directors may defer a portion of their fees in units with value equivalent to the value of shares of common stock as of the grant date.

Total share-based compensation expense (a component of operating, selling, general and administrative expenses) was $4.6 million for the twelve week period ended February 13, 2010, and was $4.9 million for the comparable prior year period. Share-based compensation expense was $8.9 million for the twenty-four week period ended February 13, 2010, and was $9.3 million for the comparable prior year period.

During the twenty-four week period ended February 13, 2010, the Company made stock option grants of 496,580 shares. The Company granted options to purchase 591,442 shares during the comparable prior year period. The weighted average fair value of the stock option awards granted during the twenty-four week periods ended February 13, 2010 and February 14, 2009, using the Black-Scholes-Merton multiple-option pricing valuation model, was $40.75 and $34.00 per share, respectively, using the following weighted average key assumptions:


	Twenty-Four Weeks Ended
	February 13,			February 14,
	2010			2009
Expected price volatility		31	%		28	%
Risk-free interest rate		1.8	%		2.5	%
Weighted average expected lives in years		4.3			4.1
Forfeiture rate		10.0	%		10.0	%
Dividend yield		0.0	%		0.0	%

See AutoZone’s 2009 Annual Report to Stockholders for a discussion of the methodology used in developing AutoZone’s assumptions to determine the fair value of the option awards.

Fair Value Measurements

6 Months Ended

Feb. 13, 2010

Fair Value Measurements [Abstract]

Fair Value Measurements

Note C — Fair Value Measurements

The Company defines fair value as the price received to transfer an asset or paid to transfer a liability in an orderly transaction between market participants at the measurement date. The Company uses a hierarchy of valuation inputs to measure fair value.

The hierarchy prioritizes the inputs into three broad levels:

Level 1 inputs—unadjusted quoted prices in active markets for identical assets or liabilities that the Company has the ability to access. An active market for the asset or liability is one in which transactions for the asset or liability occur with sufficient frequency and volume to provide ongoing pricing information.

Level 2 inputs—inputs other than quoted market prices included in Level 1 that are observable, either directly or indirectly, for the asset or liability. Level 2 inputs include, but are not limited to, quoted prices for similar assets or liabilities in an active market, quoted prices for identical or similar assets or liabilities in markets that are not active and inputs other than quoted market prices that are observable for the asset or liability, such as interest rate curves and yield curves observable at commonly quoted intervals, volatilities, credit risk and default rates.

Level 3 inputs—unobservable inputs for the asset or liability.

At February 13, 2010, our assets and liabilities required to be measured at fair value include investments (Level 1) of $71.9 million, which are included in other current assets in the accompanying Condensed Consolidated Balance Sheet. The investments are valued at the closing quoted price in the principal active market as of the last business day of the quarter. See “Note D — Marketable Securities” for further discussion.

The Company has financial instruments, including cash and cash equivalents, accounts receivable, other current assets and accounts payable. The carrying amounts of these financial instruments approximate fair value because of their short maturities. A discussion of the carrying values and fair values of the Company’s debt is included in “Note G — Debt”.

- Definition

This item represents the complete disclosure regarding the fair value of financial instruments (as defined), including financial assets and financial liabilities (collectively, as defined), and the measurements of those instruments, assets, and liabilities. Such disclosures about the financial instruments, assets, and liabilities would include: (1) the fair value of the required items together with their carrying amounts (as appropriate); (2) for items for which it is not practicable to estimate fair value, disclosure would include: (a) information pertinent to estimating fair value (including, carrying amount, effective interest rate, and maturity, and (b) the reasons why it is not practicable to estimate fair value; (3) significant concentrations of credit risk including: (a) information about the activity, region, or economic characteristics identifying a concentration, (b) the maximum amount of loss the Company is exposed to based on the gross fair value of the related item, (c) policy for requiring collateral or other security and information as to accessing such collateral or security, and (d) the nature and brief description of such collateral or security; (4) quantitative information about market risks and how such risk is are managed; (5) for items measured on both a recurring and nonrecurring basis information regarding the inputs used to develop the fair value measurement; and (6) for items presented in the financial statement for which fair value measurement is elected: (a) information necessary to understand the reasons for the election, (b) discussion of the effect of fair value changes on earnings, (c) a description of [similar groups] items for which the election is made and the relation thereof to the balance sheet, the aggregate carrying value of items included in the balance sheet that are not eligible for the election; (7) all other required (as defined) and desired information.

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Marketable Securities

6 Months Ended

Feb. 13, 2010

Marketable Securities [Abstract]

Marketable Securities

Note D — Marketable Securities

The Company invests a portion of its assets held by the Company’s wholly owned insurance captive in marketable debt securities and classifies them as available-for-sale. The Company includes these securities in other current assets in the accompanying Condensed Consolidated Balance Sheet. The investments are recorded at fair value, which is typically valued at the closing quoted price in the principal active market as of the last business day of the quarter.

Unrealized gains and losses on the marketable securities are recorded in accumulated other comprehensive income, net of tax. The Company’s basis for determining the cost of a security sold is the “Specific Identification Model”. The Company’s available-for-sale marketable securities consisted of the following:


	Amortized		Gross		Gross
	Cost		Unrealized		Unrealized
(in thousands)	Basis		Gains		Losses			Fair Value
February 13, 2010	$	70,616	$	1,364	$	(52	)	$	71,928

August 29, 2009	$	68,862	$	1,510	$	(334	)	$	70,038

The debt securities held at February 13, 2010, had maturities ranging from less than one year to less than three years and consisted primarily of high grade corporate and government fixed income securities. The Company did not realize any material gains or losses on its marketable securities during the twenty-four week period ended February 13, 2010.

As of February 13, 2010, the Company holds four securities that are in an unrealized loss position. The Company has the intent and ability to hold these investments until recovery of fair value or maturity, and does not deem the investments to be impaired on an other than temporary basis. In evaluating whether the securities are deemed to be impaired on an other than temporary basis, the Company considers factors such as the duration and severity of the loss position, the creditworthiness of the issuer, the term to maturity and intent and ability to hold the investments until maturity or until recovery of fair value.

- Definition

This item represents the entire disclosure related to Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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Merchandise Inventories	6 Months Ended
Merchandise Inventories	Feb. 13, 2010
Merchandise Inventories [Abstract]
Merchandise Inventories	Note E — Merchandise Inventories Inventories are stated at the lower of cost or market using the last-in, first-out (“LIFO”) method for domestic inventories and the first-in, first-out (“FIFO”) method for Mexico inventories. Included in inventories are related purchasing, storage and handling costs. Due to price deflation on the Company’s merchandise purchases, the Company’s domestic inventory balances are effectively maintained under the FIFO method. The Company’s policy is not to write up inventory in excess of replacement cost. The cumulative balance of this unrecorded adjustment, which will be reduced upon experiencing price inflation on the Company’s merchandise purchases, was $239.3 million at February 13, 2010, and $223.0 million at August 29, 2009.

Pension Plans

6 Months Ended

Feb. 13, 2010

Pension Plans [Abstract]

Pension Plans

Note F — Pension Plans

The components of net periodic pension expense (income) related to the Company’s pension plans for all periods presented are as follows:


	Twelve Weeks Ended						Twenty-Four Weeks Ended
	February 13,			February 14,			February 13,			February 14,
(in thousands)	2010			2009			2010			2009

Interest cost	$	2,611		$	2,457		$	5,222		$	4,914
Expected return on plan assets		(2,087	)		(2,927	)		(4,175	)		(5,854	)
Amortization of prior service cost		—			14			—			28
Amortization of net loss		1,877			17			3,755			34

Net periodic pension expense (income)	$	2,401		$	(439	)	$	4,802		$	(878	)

The Company makes contributions in amounts at least equal to the minimum funding requirements of the Employee Retirement Income Security Act of 1974, as amended by the Pension Protection Act of 2006. During the twenty-four week period ended February 13, 2010, the Company did not make any contributions to its funded plan and does not expect to make any additional cash contributions during the remainder of fiscal 2010.

Debt

6 Months Ended

Feb. 13, 2010

Debt [Abstract]

Debt

Note G — Debt

The Company’s debt consisted of the following:


	February 13,		August 29,
(in thousands)	2010		2009

4.75% Senior Notes due November 2010, effective interest rate of 4.17%	$	199,300	$	199,300
5.875% Senior Notes due October 2012, effective interest rate of 6.33%		300,000		300,000
4.375% Senior Notes due June 2013, effective interest rate of 5.65%		200,000		200,000
6.5% Senior Notes due January 2014, effective interest rate of 6.63%		500,000		500,000
5.75% Senior Notes due January 2015, effective interest rate of 5.89%		500,000		500,000
5.5% Senior Notes due November 2015, effective interest rate of 4.86%		300,000		300,000
6.95% Senior Notes due June 2016, effective interest rate of 7.09%		200,000		200,000
7.125% Senior Notes due August 2018, effective interest rate of 7.28%		250,000		250,000
Commercial paper, weighted average interest rate of 0.31% and 0.49% at February 13, 2010 and August 29, 2009, respectively		325,400		277,600

	$	2,774,700	$	2,726,900

As of February 13, 2010, the 4.75% Senior Notes due November 2010 and the commercial paper borrowings mature in the next twelve months, but are classified as long-term in the accompanying Condensed Consolidated Balance Sheet, as the Company has the ability and intent to refinance the borrowings on a long-term basis. Before considering the effect of commercial paper borrowings, the Company had $676.8 million of availability under its $800 million revolving credit facility, expiring in July 2012, which would allow it to replace these short term obligations with long-term financing.

The fair value of the Company’s debt was estimated at $2.983 billion as of February 13, 2010, and $2.853 billion as of August 29, 2009, based on the quoted market prices for the same or similar issues or on the current rates available to the Company for debt of the same remaining maturities. Such fair value is greater than the carrying value of debt by $207.9 million at February 13, 2010, and $126.5 million at August 29, 2009.

Stock Repurchase Program	6 Months Ended
Stock Repurchase Program	Feb. 13, 2010
Stock Repurchase Program [Abstract]
Stock Repurchase Program	Note H — Stock Repurchase Program From January 1, 1998 to February 13, 2010, the Company has repurchased a total of 117.4 million shares at an aggregate cost of $7.9 billion, including 1,982,783 shares of its common stock at an aggregate cost of $291.9 million during the twenty-four week period ended February 13, 2010. On December 16, 2009, the Board of Directors (the “Board”) voted to increase the authorization by $500 million to raise the cumulative share repurchase authorization from $7.9 billion to $8.4 billion. Considering cumulative repurchases as of February 13, 2010, the Company had $517.2 million remaining under the Board’s authorization to repurchase its common stock.

Comprehensive Income

6 Months Ended

Feb. 13, 2010

Comprehensive Income [Abstract]

Comprehensive Income

Note I — Comprehensive Income

Comprehensive income includes foreign currency translation adjustments; the impact from certain derivative financial instruments designated and effective as cash flow hedges, including changes in fair value, as applicable; the reclassification of gains and/or losses from accumulated other comprehensive loss to net income to offset the earnings impact of the underlying items being hedged; pension liability adjustments and changes in the fair value of certain investments classified as available-for- sale. During the twenty-four week period ended February 13, 2010, the Mexican Peso remained relatively flat against the US Dollar. The foreign currency translation adjustments of $11.2 million and $52.8 million in the twelve week and twenty-four week periods ended February 14, 2009 were attributable to the weakening of the Mexican Peso against the US Dollar, which as of February 14, 2009, had decreased by approximately 40% when compared to the fiscal year ended August 30, 2008.

Comprehensive income for all periods presented is as follows:


	Twelve Weeks Ended						Twenty-Four Weeks Ended
	February 13,			February 14,			February 13,			February 14,
(in thousands)	2010			2009			2010			2009

Net income, as reported	$	123,333		$	115,864		$	266,633		$	247,235
Foreign currency translation adjustments		(1,554	)		(11,183	)		(66	)		(52,783	)
Net impact from derivative instruments		(141	)		(1,029	)		(282	)		(2,286	)
Pension liability adjustments		2,461			—			2,461			—
Unrealized (losses) gains from marketable securities		(84	)		571			99			139

Comprehensive income	$	124,015		$	104,223		$	268,845		$	192,305

- Definition

This label may include the following: 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. Components of comprehensive income include: (1) foreign currency translation adjustments; (2) gains and losses on foreign currency transactions that are designated as, and are effective as, economic hedges of a net investment in a foreign entity; (3) gains and losses on intercompany foreign currency transactions that are of a long-term-investment nature, when the entities to the transaction are consolidated, combined, or accounted for by the equity method in the reporting enterprise's financial statements; (4) change in the market value of a futures contract that qualifies as a hedge of an asset reported at fair value; (5) unrealized holding gains and losses on available-for-sale securities and that resulting from transfers of debt securities from the held-to-maturity category to the available-for-sale category; (6) a net loss recognized as an additional pension liability not yet recognized as net periodic pension cost; and (7) the net gain or loss and net prior service cost or credit for pension plans and other postretirement benefit plans.

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Segment Reporting

6 Months Ended

Feb. 13, 2010

Segment Reporting [Abstract]

Segment Reporting

Note J — Segment Reporting

The Company’s two operating segments (Domestic Auto Parts and Mexico) are aggregated as one reportable segment: Auto Parts Stores. The criteria the Company used to identify the reportable segment are primarily the nature of the products the Company sells and the operating results that are regularly reviewed by the Company’s chief operating decision maker to make decisions about the resources to be allocated to the business units and to assess performance. The accounting policies of the Company’s reportable segment are the same as those described in Note A in its 2009 Annual Report to Stockholders.

The Auto Parts Stores segment is a retailer and distributor of automotive parts and accessories through the Company’s 4,491 stores in the United States, including Puerto Rico, and Mexico. Each store carries an extensive product line for cars, sport utility vehicles, vans and light trucks, including new and remanufactured automotive hard parts, maintenance items, accessories and non-automotive products.

The Other category reflects business activities that are not separately reportable, including ALLDATA, which produces, sells and maintains diagnostic and repair information software used in the automotive repair industry, and E-commerce, which includes direct sales to customers through www.autozone.com.

The Company evaluates its reportable segment primarily on the basis of net sales and segment profit, which is defined as gross profit. Segment results for the periods presented are as follows:


	Twelve Weeks Ended						Twenty-Four Weeks Ended
	February 13,			February 14,			February 13,			February 14,
(in thousands)	2010			2009			2010			2009
Net Sales
Auto Parts Stores	$	1,472,958		$	1,414,850		$	3,029,218		$	2,860,452
Other		33,267			33,027			66,251			65,717

Total	$	1,506,225		$	1,447,877		$	3,095,469		$	2,926,169


Segment Profit
Auto Parts Stores	$	726,797		$	692,078		$	1,499,795		$	1,406,098
Other		26,939			27,220			53,865			54,390

Gross profit		753,736			719,298			1,553,660			1,460,488
Operating, selling, general and administrative expenses		(523,355	)		(504,602	)		(1,062,850	)		(1,007,254	)
Interest expense, net		(36,309	)		(31,907	)		(72,650	)		(63,072	)

Income before income taxes	$	194,072		$	182,789		$	418,160		$	390,162