10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

x Quarterly report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the quarterly period ended May 5, 2012, or

¨ Transition report pursuant to Section 13 or 15(d) of the Securities Exchange Act of 1934

For the transition period from             to             .

Commission file number 1-10714

AUTOZONE, INC.

(Exact name of registrant as specified in its charter)

Nevada	62-1482048
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
123 South Front Street, Memphis, Tennessee	38103
(Address of principal executive offices)	(Zip Code)

(901) 495-6500

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter periods that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.     Yes  x    No  ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (§232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files).     Yes  x    No  ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act. (Check one):

Large accelerated filer	x	Accelerated filer	¨
Non-accelerated filer	¨	Smaller reporting company	¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).     Yes  ¨    No  x

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date.

Common Stock, $.01 Par Value – 37,433,856 shares outstanding as of June 8, 2012.

TABLE OF CONTENTS

PART I.	FINANCIAL INFORMATION	3
Item 1.	Financial Statements		3
	CONDENSED CONSOLIDATED BALANCE SHEETS		3
	CONDENSED CONSOLIDATED STATEMENTS OF INCOME		4
	CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS		5
	NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS		6
	REPORT OF INDEPENDENT REGISTERED PUBLIC ACCOUNTING FIRM		13
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations		14
Item 3.	Quantitative and Qualitative Disclosures About Market Risk		20
Item 4.	Controls and Procedures		20
Item 4T.	Controls and Procedures		20
PART II.	OTHER INFORMATION		21
Item 1.	Legal Proceedings		21
Item 1A.	Risk Factors		21
Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds		21
Item 3.	Defaults Upon Senior Securities		22
Item 4.	Mine Safety Disclosures		22
Item 5.	Other Information		22
Item 6.	Exhibits		23
SIGNATURES			24
EXHIBIT INDEX			25

2

PART I. FINANCIAL INFORMATION

Item 1. Financial Statements.

AUTOZONE, INC.

CONDENSED CONSOLIDATED BALANCE SHEETS

(Unaudited)

(in thousands)	May 5, 2012			August 27, 2011
Assets
Current assets:
Cash and cash equivalents	$	103,100		$	97,606
Accounts receivable		133,941			140,690
Merchandise inventories		2,629,821			2,466,107
Other current assets		77,410			88,022
Total current assets		2,944,272			2,792,425
Property and equipment:
Property and equipment		4,565,947			4,371,872
Less: Accumulated depreciation and amortization		(1,798,849	)		(1,702,997	)
		2,767,098			2,668,875
Goodwill		302,645			302,645
Deferred income taxes		22,390			10,661
Other long-term assets		112,449			94,996
		437,484			408,302
	$	6,148,854		$	5,869,602
Liabilities and Stockholders’ Deficit
Current liabilities:
Accounts payable	$	2,866,580		$	2,755,853
Accrued expenses and other		443,161			449,327
Income taxes payable		80,718			25,185
Deferred income taxes		169,625			166,449
Short-term borrowings		7,309			34,082
Total current liabilities		3,567,393			3,430,896
Long-term debt		3,599,000			3,317,600
Other long-term liabilities		399,290			375,338
Commitments and contingencies		—			—
Stockholders’ deficit:
Preferred stock, authorized 1,000 shares; no shares issued		—			—
Common stock, par value $.01 per share, authorized 200,000 shares; 39,624 shares issued and 38,069 shares outstanding as of May 5, 2012; 44,084 shares issued and 40,109 shares outstanding as of August 27, 2011		396			441
Additional paid-in capital		629,322			591,384
Retained deficit		(1,356,930	)		(643,998	)
Accumulated other comprehensive loss		(116,657	)		(119,691	)
Treasury stock, at cost		(572,960	)		(1,082,368	)
Total stockholders’ deficit		(1,416,829	)		(1,254,232	)
	$	6,148,854		$	5,869,602

See Notes to Condensed Consolidated Financial Statements.

3

AUTOZONE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF INCOME

(Unaudited)

	Twelve Weeks Ended				Thirty-Six Weeks Ended
(in thousands, except per share data)	May 5, 2012		May 7, 2011		May 5, 2012		May 7, 2011
Net sales	$	2,111,866	$	1,978,369	$	5,840,277	$	5,430,977
Cost of sales, including warehouse and delivery expenses		1,022,067		964,839		2,840,636		2,664,088
Gross profit		1,089,799		1,013,530		2,999,641		2,766,889
Operating, selling, general and administrative expenses		662,549		620,605		1,930,806		1,796,095
Operating profit		427,250		392,925		1,068,835		970,794
Interest expense, net		39,743		39,916		117,760		116,745
Income before income taxes		387,507		353,009		951,075		854,049
Income taxes		138,921		125,636		344,434		306,544
Net income	$	248,586	$	227,373	$	606,641	$	547,505
Weighted average shares for basic earnings per share		38,644		41,978		39,263		43,349
Effect of dilutive stock equivalents		946		977		968		973
Adjusted weighted average shares for diluted earnings per share		39,590		42,955		40,231		44,322
Basic earnings per share	$	6.43	$	5.42	$	15.45	$	12.63
Diluted earnings per share	$	6.28	$	5.29	$	15.08	$	12.35

See Notes to Condensed Consolidated Financial Statements.

4

AUTOZONE, INC.

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS

(Unaudited)

	Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011
Cash flows from operating activities:
Net income	$	606,641		$	547,505
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment		145,177			133,347
Amortization of debt origination fees		5,426			6,060
Income tax benefit from exercise of stock options		(37,263	)		(22,027	)
Deferred income taxes		3,413			(9,771	)
Share-based compensation expense		23,872			18,482
Changes in operating assets and liabilities:
Accounts receivable		6,556			(9,872	)
Merchandise inventories		(169,578	)		(174,138	)
Accounts payable and accrued expenses		102,849			277,158
Income taxes payable		92,438			111,823
Other, net		19,076			18,326
Net cash provided by operating activities		798,607			896,893
Cash flows from investing activities:
Capital expenditures		(228,277	)		(200,584	)
Purchase of marketable securities		(34,132	)		(34,720	)
Proceeds from sale of marketable securities		30,306			32,087
Disposal of capital assets and other, net		5,870			2,299
Net cash used in investing activities		(226,233	)		(200,918	)
Cash flows from financing activities:
Net payments of commercial paper		(218,600	)		(11,900	)
Net (payments) proceeds from short-term borrowings		(24,793	)		19,690
Proceeds from issuance of debt		500,000			500,000
Repayment of debt		—			(199,300	)
Net proceeds from sale of common stock		50,521			42,147
Purchase of treasury stock		(882,725	)		(1,033,488	)
Income tax benefit from exercise of stock options		37,263			22,027
Payments of capital lease obligations		(17,352	)		(16,683	)
Other, net		(10,927	)		(17,180	)
Net cash used in financing activities		(566,613	)		(694,687	)
Effect of exchange rate changes on cash		(267	)		799
Net increase in cash and cash equivalents		5,494			2,087
Cash and cash equivalents at beginning of period		97,606			98,280
Cash and cash equivalents at end of period	$	103,100		$	100,367

See Notes to Condensed Consolidated Financial Statements.

5

AUTOZONE, INC.

NOTES TO CONDENSED CONSOLIDATED FINANCIAL STATEMENTS

(Unaudited)

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 of the Securities and Exchange Commission’s (the “SEC”) rules and regulations. 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 related notes included in the AutoZone, Inc. (“AutoZone” or the “Company”) Annual Report on Form 10-K for the year ended August 27, 2011.

Operating results for the twelve and thirty-six weeks ended May 5, 2012, are not necessarily indicative of the results that may be expected for the fiscal year ending August 25, 2012. 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 quarters for fiscal 2011 and fiscal 2012 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.

Recent Accounting Pronouncements: In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income, which amends Accounting Standards Codification (“ASC”) Topic 220, Comprehensive Income. The purpose of ASU 2011-12 is to defer the effective date pertaining to reclassification adjustments out of accumulated other comprehensive income in ASU 2011-05, Presentation of Comprehensive Income, until the FASB is able to reconsider operational concerns related to ASU 2011-05. All other requirements in ASU 2011-05 are not affected by ASU 2011-12, including the requirement to report comprehensive income either in a single continuous financial statement or in two separate but consecutive financial statements. The Company does not expect the provisions of ASU 2011-05 or ASU 2011-12 to have a material impact on the consolidated financial statements. Both ASU 2011-05 and ASU 2011-12 will be effective for the Company’s fiscal year ending August 31, 2013, including interim periods within that year.

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, restricted stock grants, restricted stock unit grants and the discount on shares sold to employees under share purchase plans. Additionally, directors’ fees are paid in restricted stock units with value equivalent to the value of shares of common stock as of the grant date. The change in fair value of liability-based stock awards is also recognized in share-based compensation expense.

Total share-based compensation expense (a component of Operating, selling, general and administrative expenses) was $8.8 million for the twelve week period ended May 5, 2012, and was $6.4 million for the comparable prior year period. Share-based compensation expense was $23.9 million for the thirty-six week period ended May 5, 2012, and was $18.5 million for the comparable prior year period.

During the thirty-six week period ended May 5, 2012, 467,644 shares of stock options were exercised at a weighted average exercise price of $110.13. In the comparable prior year period, 436,394 shares of stock options were exercised at a weighted average exercise price of $99.87.

The Company made stock option grants of 377,130 shares during the thirty-six week period ended May 5, 2012, and granted options to purchase 424,780 shares during the comparable prior year period. The weighted average fair value of the stock option awards granted during the thirty-six week periods ended May 5, 2012, and May 7, 2011, using the Black-Scholes-Merton multiple-option pricing valuation model, was $93.42 and $58.58 per share, respectively, using the following weighted average key assumptions:

	Thirty-Six Weeks Ended
	May 5, 2012			May 7, 2011
Expected price volatility		31	%		31	%
Risk-free interest rate		0.7	%		1.0	%
Weighted average expected lives (in years)		5.3			4.3
Forfeiture rate		10	%		10	%
Dividend yield		0	%		0	%

See AutoZone’s Annual Report on Form 10-K for the year ended August 27, 2011, for a discussion regarding the methodology used in developing AutoZone’s assumptions to determine the fair value of the option awards and a description of AutoZone’s 2011 Equity Incentive Award Plan and the 2011 Director Compensation Program.

6

For the twelve week periods ended May 5, 2012 and May 7, 2011, there were no anti-dilutive shares excluded from the diluted earnings per share computation. There were 1,500 anti-dilutive shares excluded from the diluted earnings per share computation for the thirty-six week period ended May 5, 2012, and 1,260 anti-dilutive shares excluded for the comparable prior year.

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.

Financial Assets & Liabilities Measured at Fair Value on a Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis were as follows:

	May 5, 2012
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	5,542	$	—	$	—	$	5,542
Other long-term assets		60,394		10,808		—		71,202
	$	65,936	$	10,808	$	—	$	76,744
	August 27, 2011
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	11,872	$	—	$	—	$	11,872
Other long-term assets		55,390		5,869		—		61,259
	$	67,262	$	5,869	$	—	$	73,131

At May 5, 2012, the fair value measurement amounts for assets and liabilities recorded in the accompanying Condensed Consolidated Balance Sheet consisted of short-term marketable securities of $5.5 million, which are included within Other current assets, and long-term marketable securities of $71.2 million, which are included in Other long-term assets. The Company’s marketable securities are typically valued at the closing price in the principal active market as of the last business day of the quarter or through the use of other market inputs relating to the securities, including benchmark yields and reported trades. The fair values of the marketable securities, by asset class, are described in “Note D – Marketable Securities”.

Non-Financial Assets measured at Fair Value on a Non-Recurring Basis

Non-financial assets could be required to be measured at fair value on a non-recurring basis in certain circumstances, including the event of impairment. The assets could include assets acquired in an acquisition as well as property, plant and equipment that are determined to be impaired. During the thirty-six week periods ended May 5, 2012 and May 7, 2011, the Company did not have any significant non-financial assets measured at fair value on a non-recurring basis in periods subsequent to initial recognition.

Financial Instruments not Recognized at Fair Value

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 H – Financing”.

7

Note D – Marketable Securities

The Company’s basis for determining the cost of a security sold is the “Specific Identification Model”. Unrealized gains (losses) on marketable securities are recorded in Accumulated other comprehensive loss. The Company’s available-for-sale marketable securities consisted of the following:

	May 5, 2012
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	24,930	$	234	$	(5	)	$	25,159
Government bonds		27,792		184		(3	)		27,973
Mortgage-backed securities		4,868		26		(4	)		4,890
Asset-backed securities and other		18,628		94		—			18,722
	$	76,218	$	538	$	(12	)	$	76,744
	August 27, 2011
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	26,261	$	229	$	(45	)	$	26,445
Government bonds		29,464		343		—			29,807
Mortgage-backed securities		4,291		55		—			4,346
Asset-backed securities and other		12,377		156		—			12,533
	$	72,393	$	783	$	(45	)	$	73,131

The debt securities held at May 5, 2012, had effective maturities ranging from less than one year to approximately 3 years. The Company did not realize any material gains or losses on its marketable securities during the thirty-six week period ended May 5, 2012.

The Company holds eight securities that are in an unrealized loss position of approximately $12 thousand at May 5, 2012. 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 credit worthiness of the investee, the term to maturity and the intent and ability to hold the investments until maturity or until recovery of fair value.

Note E – Derivative Financial Instruments

During the third quarter of fiscal 2012, the Company entered into two treasury rate locks. These agreements were designated as cash flow hedges and were used to hedge the exposure to variability in future cash flows resulting from changes in variable interest rates related to the $500 million Senior Note debt issuance in April 2012. The treasury rate locks had notional amounts of $300 million and $100 million with associated fixed rates of 2.09% and 2.07% respectively. The locks were benchmarked based on the 10-year U.S. treasury notes. These locks expired on April 20, 2012 and resulted in a loss of $2.8 million, which has been deferred in Accumulated other comprehensive loss and will be reclassified to Interest expense over the life of the underlying debt. The hedges remained highly effective until they expired, and no ineffectiveness was recognized in earnings.

During the first quarter of fiscal 2011, the Company was party to three forward starting swaps, of which two were entered into during the fourth quarter of fiscal 2010 and one was entered into during the first quarter of fiscal 2011. These agreements were designated as cash flow hedges and were used to hedge the exposure to variability in future cash flows resulting from changes in variable interest rates related to the $500 million Senior Note debt issuance during the first quarter of fiscal 2011. The swaps had notional amounts of $150 million, $150 million and $100 million with associated fixed rates of 3.15%, 3.13%, and 2.57%, respectively. The swaps were benchmarked based on the 3-month London InterBank Offered Rate (“LIBOR”). These swaps expired in November 2010 and resulted in a loss of $11.7 million, which has been deferred in Accumulated other comprehensive loss and will be reclassified to Interest expense over the life of the underlying debt. The hedges remained highly effective until they expired, and no ineffectiveness was recognized in earnings.

8

At May 5, 2012, the Company had $5.4 million recorded in Accumulated other comprehensive loss related to net realized losses associated with terminated interest rate swap and treasury rate lock derivatives which were designated as hedging instruments. Net losses are amortized into Interest expense over the remaining life of the associated debt. During the thirty-six week period ended May 5, 2012, the Company reclassified $1.2 million of net losses from Accumulated other comprehensive loss to Interest expense. In the comparable prior year period, the Company reclassified $858 thousand of net losses from Accumulated other comprehensive loss to Interest expense. The Company expects to reclassify $1.7 million of net losses from Accumulated other comprehensive loss to Interest expense over the next 12 months.

Subsequent to May 5, 2012, the Company entered into two treasury rate locks, each with a notional amount of $100 million. These agreements, which are set to expire on November 1, 2012, are cash flow hedges used to hedge the exposure to variability in future cash flows resulting from changes in variable interest rates relating to an anticipated debt transaction. The fixed rates of the hedges are 2.07% and 1.92% and are benchmarked based on the 10-year U.S. treasury notes. It is expected that upon settlement of these agreements, the realized gain or loss will be deferred in Accumulated other comprehensive loss and reclassified to Interest expense over the life of the underlying debt.

Note F – 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 $266.2 million at May 5, 2012, and $253.3 million at August 27, 2011.

Note G – Pension and Savings Plans

The components of net periodic pension expense related to the Company’s pension plans consisted of the following:

	Twelve Weeks Ended						Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011			May 5, 2012			May 7, 2011
Interest cost	$	2,819		$	2,570		$	8,456		$	7,709
Expected return on plan assets		(2,704	)		(2,152	)		(8,112	)		(6,456	)
Amortization of net loss		2,260			2,170			6,781			6,511
Net periodic pension expense	$	2,375		$	2,588		$	7,125		$	7,764

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 thirty-six week period ended May 5, 2012, the Company made contributions to its funded plan in the amount of $4.6 million. The Company expects to contribute approximately $10.7 million to the plan during the remainder of fiscal 2012; however, a change to the expected cash funding may be impacted by a change in interest rates or a change in the actual or expected return on plan assets.

Note H – Financing

The Company’s long-term debt consisted of the following:

(in thousands)	May 5, 2012		August 27, 2011
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
6.500% Senior Notes due January 2014, effective interest rate of 6.63%		500,000		500,000
5.750% Senior Notes due January 2015, effective interest rate of 5.89%		500,000		500,000
5.500% Senior Notes due November 2015, effective interest rate of 4.86%		300,000		300,000
6.950% 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
4.000% Senior Notes due November 2020, effective interest rate of 4.43%		500,000		500,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85%		500,000		—
Commercial paper, weighted average interest rate of 0.44% and 0.35% at May 5, 2012 and August 27, 2011, respectively		349,000		567,600
	$	3,599,000	$	3,317,600

9

As of May 5, 2012, the commercial paper borrowings and the 5.875% Senior Notes due October 2012 mature in the next twelve months, but are classified as long-term in the accompanying Condensed Consolidated Balance Sheets, as the Company has the ability and intent to refinance them on a long-term basis. Specifically, excluding the effect of commercial paper borrowings, the Company had $996.6 million of availability under its $1.0 billion revolving credit facility, expiring in September 2016, which would allow it to replace these short-term obligations with long-term financing.

In addition to the long-term debt discussed above, as of May 5, 2012, the Company had $7.3 million of short-term borrowings that are scheduled to mature in the next 12 months. The short-term borrowings are unsecured, peso-denominated borrowings and accrued interest at 4.63% as of May 5, 2012.

On April 24, 2012, the Company issued $500 million in 3.700% Senior Notes due April 2022 under the Company’s shelf registration statement filed with the Securities and Exchange Commission on April 17, 2012 (the “Shelf Registration”). The Shelf Registration allows the Company to sell an indeterminate amount in debt securities to fund general corporate purposes, including repaying, redeeming or repurchasing outstanding debt and for working capital, capital expenditures, new store openings, stock repurchases and acquisitions. The Company used the proceeds from the issuance of debt to repay a portion of the commercial paper borrowings and for general corporate purposes.

In September 2011, the Company amended and restated its $800 million revolving credit facility, which was scheduled to expire in July 2012. The capacity under the revolving credit facility was increased to $1.0 billion. This credit facility is available to primarily support commercial paper borrowings, letters of credit and other short-term unsecured bank loans. The capacity of the credit facility may be increased to $1.250 billion prior to the maturity date at the Company’s election and subject to bank credit capacity and approval, may include up to $200 million in letters of credit, and may include up to $175 million in capital leases each fiscal year. Under the revolving credit facility, the Company may borrow funds consisting of Eurodollar loans or base rate loans. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the credit facility. The Company also has the option to borrow funds under the terms of a swingline loan subfacility. The revolving credit facility expires in September 2016.

The fair value of the Company’s debt was estimated at $3.896 billion as of May 5, 2012, and $3.633 billion as of August 27, 2011, 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 terms (Level 2). Such fair value is greater than the carrying value of debt by $289.7 million at May 5, 2012, and $281.0 million at August 27, 2011.

Note I – Stock Repurchase Program

From January 1, 1998 to May 5, 2012, the Company has repurchased a total of 129.9 million shares at an aggregate cost of $11.1 billion, including 2,510,029 shares of its common stock at an aggregate cost of $882.7 million during the thirty-six week period ended May 5, 2012. On March 7, 2012, the Board voted to increase the authorization by $750 million to raise the cumulative share repurchase authorization from $11.15 billion to $11.9 billion. Considering the cumulative repurchases as of May 5, 2012, the Company had $835.9 million remaining under the Board’s authorization to repurchase its common stock. Subsequent to May 5, 2012, the Company has repurchased 893,910 shares of its common stock at an aggregate cost of $335.5 million.

During the thirty-six week period ended May 5, 2012, the Company retired 4.9 million shares of treasury stock which had previously been repurchased under the Company’s share repurchase program. The retirement increased Retained deficit by $1,319.6 million and decreased Additional paid-in capital by $72.5 million. During the comparable prior year period, the Company retired 6.6 million shares of treasury stock, which increased Retained deficit by $1,247.7 million and decreased Additional paid-in capital by $82.2 million.

Note J – 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.

Comprehensive income consisted of the following:

	Twelve Weeks Ended					Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011		May 5, 2012			May 7, 2011
Net income	$	248,586		$	227,373	$	606,641		$	547,505
Foreign currency translation adjustments		(10,355	)		8,508		(13,616	)		24,790
Net impact from derivative instruments		(1,513	)		405		1,619			(4,594	)
Pension liability adjustments		1,372			736		15,169			3,979
Unrealized gains (losses) from marketable securities		(27	)		220		(138	)		(181	)
Comprehensive income	$	238,063		$	237,242	$	609,675		$	571,499

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Note K – Litigation

The Company was a defendant in a lawsuit entitled “Coalition for a Level Playing Field, L.L.C., et al., v. AutoZone, Inc. et al.,” filed in the U.S. District Court for the Southern District of New York in October 2004. The case was filed by more than 200 plaintiffs, which are principally automotive aftermarket warehouse distributors and jobbers, against a number of defendants, including automotive aftermarket retailers and aftermarket automotive parts manufacturers. The plaintiffs alleged, inter alia, that some or all of the automotive aftermarket retailer defendants including AutoZone had knowingly received, in violation of the Robinson-Patman Act, from various of the manufacturer defendants benefits such as volume discounts, rebates, early buy allowances and other allowances, fees, and other payments including sham advertising and promotional payments that were not available to Plaintiffs.

In an order issued on September 16, 2010, the court granted motions to dismiss all claims against AutoZone and its co-defendant competitors and suppliers. The court ordered the case closed, but allowed plaintiffs to move for leave to file a third amended complaint. In an order dated September 28, 2011, the court denied the plaintiffs’ motion for leave to file a third amended complaint because the proposed third amended complaint failed to address deficiencies previously identified by the court. On October 26, 2011, plaintiffs filed an appeal of the dismissal in the U.S. Court of Appeals for the Second Circuit. Following mediation, on March 23, 2012, all parties settled the case pursuant to a confidential settlement agreement. On April 5, 2012, the case was withdrawn with prejudice from the U.S. Court of Appeals for the Second Circuit. On April 11, 2012, the case was dismissed with prejudice by the U.S. District Court for the Southern District of New York.

In 2004, the Company acquired a store site in Mount Ephraim, New Jersey that had previously been the site of a gasoline service station and contained evidence of groundwater contamination. Upon acquisition, the Company voluntarily reported the groundwater contamination issue to the New Jersey Department of Environmental Protection and entered into a Voluntary Remediation Agreement providing for the remediation of the contamination associated with the property. The Company has conducted and paid for (at an immaterial cost to the Company) remediation of visible contamination on the property and is investigating, and will be addressing, potential vapor intrusion impacts in downgradient residences and businesses. The New Jersey Department of Environmental Protection has indicated that it will assert that the Company is liable for the downgradient impacts under a joint and severable liability theory, and the Company intends to contest any such assertion. Pursuant to the Voluntary Remediation Agreement, upon completion of all remediation required by the agreement, the Company believes it should be eligible to be reimbursed up to 75 percent of qualified remediation costs by the State of New Jersey. The Company has asked the state for clarification that the agreement applies to off-site work, and the state is considering the request. Although the aggregate amount of additional costs that the Company may incur pursuant to the remediation cannot currently be ascertained, the Company does not currently believe that fulfillment of its obligations under the agreement or otherwise will result in costs that are material to its financial condition, results of operations or cash flow.

The Company is involved in various other legal proceedings incidental to the conduct of its business, including several lawsuits containing class-action allegations in which the plaintiffs are current and former hourly and salaried employees who allege various wage and hour violations and unlawful termination practices. The Company does not currently believe that, either individually or in the aggregate, these matters will result in liabilities material to the Company’s financial condition, results of operations or cash flows.

Note L – 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 Annual Report on Form 10-K for the year ended August 27, 2011.

The Auto Parts Stores segment is a retailer and distributor of automotive parts and accessories through the Company’s 4,910 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.

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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 were as follows:

	Twelve Weeks Ended						Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011			May 5, 2012			May 7, 2011
Net Sales
Auto Parts Stores	$	2,068,643		$	1,939,094		$	5,715,683		$	5,318,031
Other		43,223			39,275			124,594			112,946
Total	$	2,111,866		$	1,978,369		$	5,840,277		$	5,430,977
Segment Profit
Auto Parts Stores	$	1,056,587		$	983,256		$	2,903,437		$	2,678,814
Other		33,212			30,274			96,204			88,075
Gross profit		1,089,799			1,013,530			2,999,641			2,766,889
Operating, selling, general and administrative expenses		(662,549	)		(620,605	)		(1,930,806	)		(1,796,095	)
Interest expense, net		(39,743	)		(39,916	)		(117,760	)		(116,745	)
Income before income taxes	$	387,507		$	353,009		$	951,075		$	854,049

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Report of Independent Registered Public Accounting Firm

The Board of Directors and Stockholders

AutoZone, Inc.

We have reviewed the condensed consolidated balance sheet of AutoZone, Inc. as of May 5, 2012, the related condensed consolidated statements of income for the twelve and thirty-six week periods ended May 5, 2012 and May 7, 2011, and the condensed consolidated statements of cash flows for the thirty-six week periods ended May 5, 2012 and May 7, 2011. These financial statements are the responsibility of the Company’s management.

We conducted our review in accordance with the standards of the Public Company Accounting Oversight Board (United States). A review of interim financial information consists principally of applying analytical procedures and making inquiries of persons responsible for financial and accounting matters. It is substantially less in scope than an audit conducted in accordance with the standards of the Public Company Accounting Oversight Board, the objective of which is the expression of an opinion regarding the financial statements taken as a whole. Accordingly, we do not express such an opinion.

Based on our review, we are not aware of any material modifications that should be made to the condensed consolidated financial statements referred to above for them to be in conformity with U.S. generally accepted accounting principles.

We have previously audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States), the consolidated balance sheet of AutoZone, Inc. as of August 27, 2011, and the related consolidated statements of income, stockholders’ deficit, and cash flows for the year then ended, not presented herein, and, in our report dated October 24, 2011, we expressed an unqualified opinion on those consolidated financial statements. In our opinion, the information set forth in the accompanying condensed consolidated balance sheet as of August 27, 2011, is fairly stated, in all material respects, in relation to the consolidated balance sheet from which it has been derived.

/s/ Ernst & Young LLP

Memphis, Tennessee

June 13, 2012

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Item 2. Management’s Discussion and Analysis of Financial Condition and Results of Operations.

Overview

We are the nation’s leading retailer, and a leading distributor, of automotive replacement parts and accessories in the United States. We began operations in 1979 and at May 5, 2012, operated 4,613 stores in the United States, including Puerto Rico, and 297 in Mexico. Each of our stores 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. At May 5, 2012, in 2,946 of our domestic stores, we also have a commercial sales program that provides commercial credit and prompt delivery of parts and other products to local, regional and national repair garages, dealers, service stations and public sector accounts. We have commercial programs in select stores in Mexico as well. We also sell the ALLDATA brand automotive diagnostic and repair software through www.alldata.com and www.alldatadiy.com. Additionally, we sell automotive hard parts, maintenance items, accessories, and non-automotive products through www.autozone.com, and our commercial customers can make purchases through www.autozonepro.com. We do not derive revenue from automotive repair or installation services.

Operating results for the twelve and thirty-six weeks ended May 5, 2012, are not necessarily indicative of the results that may be expected for the fiscal year ending August 25, 2012. Each of the first three quarters of our fiscal year consists of 12 weeks, and the fourth quarter consists of 16 or 17 weeks. The fourth quarters for fiscal 2011 and fiscal 2012 each have 16 weeks. Our business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.

Executive Summary

Net sales were up 6.7% for the quarter, driven by domestic same store sales growth of 3.9%. We experienced sales growth from both our retail and commercial customers. Earnings per share increased 18.6% for the quarter.

Over the past several years, various factors have occurred within the economy that affect both our consumer and our industry, including the impact of the recession, continued high unemployment and other challenging economic conditions, which we believe have aided our sales growth during the quarter. As consumers’ cash flows have decreased due to these factors, we believe consumers have become more likely to keep their current vehicles longer and perform repair and maintenance in order to keep those vehicles well maintained. Given the nature of these macroeconomic factors, we cannot predict whether or for how long these trends will continue, nor can we predict to what degree these trends will impact us in the future.

More recently, we feel other macroeconomic factors have adversely impacted both our consumer and our industry. During the third quarter of fiscal 2012, the price per gallon of unleaded gasoline in the United States remained at a high level beginning the quarter at $3.52 per gallon and increasing to $3.79 per gallon. During the prior year, gas prices began the quarter at $3.14 per gallon and increased to $3.97 per gallon. While we have seen recent declines in gas prices as compared to the comparable prior year period, we continue to believe gas prices remain at overall high levels, thereby reducing discretionary spending for all consumers, and, in particular, our customers. Given the unpredictability of gas prices, we cannot predict whether gas prices will increase or decrease, nor can we predict how any future changes in gas prices will impact our sales in future periods.

Our primary response to fluctuations in the demand for the products we sell are to adjust our inventory levels, store staffing, and advertising messages. We continue to believe we are well positioned to help our customers save money and meet their needs in a challenging macro environment.

Historically, the two statistics that we believed had the closest correlation to our market growth over the long-term were miles driven and the number of seven year old or older vehicles on the road. While over the long-term, we have seen a close correlation between our net sales and the number of miles driven, we have also seen short time frames of minimal correlation in sales performance and miles driven. During the periods of minimal correlation between net sales and miles driven, we believe net sales have been positively impacted by other factors, including the number of seven year old or older vehicles on the road. Since the beginning of fiscal year 2011 and through March 2012 (latest publicly available information), miles driven have decreased slightly as compared to the corresponding prior period. However, during the first quarter of calendar 2012, miles driven improved by 1.4% as compared to the prior year period. The average age of the U.S. light vehicle fleet continues to trend in our industry’s favor. We believe that annual miles driven will continue to improve to a low single digit growth rate over time and that the number of seven year old or older vehicles will continue to increase; however, we are unable to predict the impact, if any, these indicators will have on future results.

During the third quarter, we believe that weather had an impact on the mix of products that we sold. Typically, our third quarter benefits from increased sales of maintenance items. However, this category experienced a slight decrease as a percentage of total product mix as compared to the prior year. We believe traditional maintenance jobs were shifted into January and February as a result of the milder than normal winter. We remain focused on refining and expanding our product assortment to ensure we have the best merchandise at the right price in each of our categories.

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Twelve Weeks Ended May 5, 2012,

Compared with Twelve Weeks Ended May 7, 2011

Net sales for the twelve weeks ended May 5, 2012, increased $133.5 million to $2.112 billion, or 6.7%, over net sales of $1.978 billion for the comparable prior year period. Total auto parts sales increased by 6.7%, primarily driven by a domestic same store sales (sales for stores open at least one year) increase of 3.9% and net sales of $53.9 million from new stores. The domestic same store sales increase was driven by higher transaction value, partially offset by decreased transaction counts. Higher transaction value is attributable to product inflation due to more complex, costly products and commodity price increases.

Gross profit for the twelve weeks ended May 5, 2012, was $1.090 billion, or 51.6% of net sales, compared with $1.014 billion, or 51.2% of net sales, during the comparable prior year period. The improvement in gross profit was primarily attributable to leveraging distribution costs due to higher sales (25 basis points) and lower shrink expense.

Operating, selling, general and administrative expenses for the twelve weeks ended May 5, 2012, were $662.5 million, or 31.4% of net sales, compared with $620.6 million, or 31.4% of net sales, during the comparable prior year period. During the quarter, operating expenses, as a percentage of sales, were favorably impacted by lower incentive compensation (31 basis points), which was partially offset by higher self-insurance costs (23 basis points).

Net interest expense for the twelve weeks ended May 5, 2012, was $39.7 million compared with $39.9 million during the comparable prior year period. This decrease was primarily due to a decrease in borrowing rates, offset by the increase in debt over the comparable prior year period. Average borrowings for the twelve weeks ended May 5, 2012, were $3.489 billion, compared with $3.219 billion for the comparable prior year period. Weighted average borrowing rates were 4.7% for the twelve weeks ended May 5, 2012, and 5.0% for the twelve weeks ended May 7, 2011.

Our effective income tax rate was 35.8% of pretax income for the twelve weeks ended May 5, 2012, and 35.6% for the comparable prior year period.

Net income for the twelve week period ended May 5, 2012, increased by $21.2 million to $248.6 million, and diluted earnings per share increased by 18.6% to $6.28 from $5.29 in the comparable prior year period. The impact on current quarter diluted earnings per share from stock repurchases since the end of the comparable prior year period was an increase of $0.47.

Thirty-Six Weeks Ended May 5, 2012,

Compared with Thirty-Six Weeks Ended May 7, 2011

Net sales for the thirty-six weeks ended May 5, 2012, increased $409.3 million to $5.840 billion, or 7.5% over net sales of $5.431 billion for the comparable prior year period. Total auto parts sales increased by 7.5%, primarily driven by an increase in domestic comparable same store sales of 4.7% and net sales of $148.5 million from new stores. The domestic same store sales increase was driven by higher transaction value partially offset by decreased transaction counts.

Gross profit for the thirty-six weeks ended May 5, 2012, was $3.000 billion, or 51.4% of net sales, compared with $2.767 billion, or 50.9% of net sales, during the comparable prior year period. The improvement in gross margin was primarily attributable to lower shrink expense (24 basis points) and leveraging distribution costs due to higher sales (22 basis points).

Operating, selling, general and administrative expenses for the thirty-six weeks ended May 5, 2012, were $1.931billion, or 33.1% of net sales, compared with $1.796 billion, or 33.1% of net sales, during the comparable prior year period. The slight improvement in operating expenses was due to lower incentive compensation (25 basis points), favorable legal expense (14 basis points) and leverage from higher sales volumes, partially offset by higher self insurance costs (45 basis points).

Net interest expense for the thirty-six weeks ended May 5, 2012, was $117.8 million compared with $116.7 million during the comparable prior year period. This increase was primarily due to the increase in debt over the comparable prior year period, partially offset by a decline in borrowing rates. Average borrowings for the thirty-six weeks ended May 5, 2012, were $3.401 billion, compared with $3.075 billion for the comparable prior year period. Weighted average borrowing rates were 4.7% for the thirty-six weeks ended May 5, 2012, and 5.1% for the thirty-six weeks ended May 7, 2011.

Our effective income tax rate was 36.2% of pretax income for the thirty-six weeks ended May 5, 2012, and 35.9% for the comparable prior year period.

Net income for the thirty-six week period ended May 5, 2012, increased by $59.1 million to $606.6 million, and diluted earnings per share increased by 22.1% to $15.08 from $12.35 in the comparable prior year period. The impact on year to date diluted earnings per share from stock repurchases since the end of the comparable prior year period was an increase of $0.87.

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Liquidity and Capital Resources

The primary source of our liquidity is our cash flows realized through the sale of automotive parts, products and accessories. For the thirty-six weeks ended May 5, 2012, our net cash flows from operating activities provided $798.6 million as compared with $896.9 million provided during the comparable prior year period. The decrease is primarily due to the change in inventories net of payables.

Our net cash flows from investing activities for the thirty-six weeks ended May 5, 2012, used $226.2 million as compared with $200.9 million used in the comparable prior year period. Capital expenditures for the thirty-six weeks ended May 5, 2012, were $228.3 million compared to $200.6 million for the comparable prior year period. The increase is primarily driven by a shift in the mix in types of stores opened and increased investment in our hub initiative. Investing cash flows were also impacted by our wholly owned insurance captive, which purchased $34.1 million and sold $30.3 million in marketable securities during the thirty-six weeks ended May 5, 2012. During the comparable prior year period, the captive purchased $34.7 million in marketable securities and sold $32.1 million in marketable securities. Capital asset disposals and other provided $5.9 million during the thirty-six week period ended May 5, 2012, and $2.3 million in the comparable prior year period.

Our net cash flows from financing activities for the thirty-six weeks ended May 5, 2012, used $566.6 million compared to $694.7 million used in the comparable prior year period. During the thirty six weeks ended May 5, 2012, we received $500.0 million in proceeds from the issuance of debt. The proceeds were used for the repayment of a portion of commercial paper borrowings and general corporate purposes. During the comparable prior year, proceeds from the issuance of debt totaled $500.0 million. Those proceeds were used for the repayment of debt of $199.3 million, the repayment of a portion of our commercial paper borrowings, and general corporate purposes. For the thirty-six weeks ended May 5, 2012, net payments of commercial paper and short-term borrowings were $243.4 million as compared to proceeds from net borrowings of $7.8 million in the comparable prior year period. Stock repurchases were $882.7 million in the current thirty-six week period as compared with $1.033 billion in the comparable prior year period. For the thirty-six weeks ended May 5, 2012, proceeds from the sale of common stock and exercises of stock options provided $87.8 million, including $37.3 million in related tax benefits. In the comparable prior year period, proceeds from the sale of common stock and exercises of stock options provided $64.2 million, including $22.0 million in related tax benefits.

During fiscal 2012, we expect to invest in our business at an increased rate as compared to fiscal 2011. Our investment is expected to be directed primarily to our new-store development program and enhancements to existing stores and infrastructure. The amount of our investments in our new-store program is impacted by different factors, including such factors as whether the building and land are purchased (requiring higher investment) or leased (generally lower investment), located in the United States or Mexico, or located in urban or rural areas. During fiscal 2011 and fiscal 2010, our capital expenditures increased by approximately 2% and 16%, respectively, as compared to the prior year, and we expect our capital expenditures for fiscal 2012 to increase by 15% to 20% as compared to fiscal 2011. Our mix of store openings has moved away from build-to-suit leases (lower initial capital investment) to ground leases and land purchases (higher initial capital investment), resulting in increased capital expenditures per store during recent years. We expect this trend to continue during the remainder of the fiscal year ending August 25, 2012.

In addition to the building and land costs, our new-store development program requires working capital, predominantly for inventories. Historically, we have negotiated extended payment terms from suppliers, reducing the working capital required and resulting in a high accounts payable to inventory ratio. Accounts payable, as a percent of gross inventory, finished the quarter at 109%, flat with last year’s third quarter. We plan to continue leveraging our inventory purchases; however, our ability to do so may be limited by our vendors’ capacity to factor their receivables from us. Certain vendors participate in financing arrangements with financial institutions whereby they factor their receivables from us, allowing them to receive payment on our invoices at a discounted rate.

Depending on the timing and magnitude of our future investments (either in the form of leased or purchased properties or acquisitions), we anticipate that we will rely primarily on internally generated funds and available borrowing capacity to support a majority of our capital expenditures, working capital requirements and stock repurchases. The balance may be funded through new borrowings. We anticipate that we will be able to obtain such financing in view of our current credit ratings and favorable experiences in the debt markets in the past.

For the trailing four quarters ended May 5, 2012, our after-tax return on invested capital (“ROIC”) was 32.7% as compared to 30.2% for the comparable prior year period. ROIC is calculated as after-tax operating profit (excluding rent charges) divided by average invested capital (which includes a factor to capitalize operating leases). ROIC increased primarily due to increased after-tax operating profit. We use ROIC to evaluate whether we are effectively using our capital resources and believe it is an important indicator of our overall operating performance.

Debt Facilities

In September 2011, we amended and restated our $800 million revolving credit facility, which was scheduled to expire in July 2012. The capacity under the revolving credit facility was increased to $1.0 billion. This credit facility is available to primarily support commercial paper borrowings, letters of credit and other short-term, unsecured bank loans. The capacity of the credit facility may be increased to $1.250 billion prior to the maturity date at our election and subject to bank credit capacity and approval, may include up to $200 million in letters of credit, and may include up to $175 million in capital leases each fiscal year. Under the revolving credit facility, we may borrow funds consisting of Eurodollar loans or base rate loans. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as the London InterBank Offered Rate (“LIBOR”) plus the applicable percentage, as defined in the revolving credit facility, depending upon our senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the revolving credit facility. We also have the option to borrow funds under the terms of a swingline loan subfacility. The revolving credit facility expires in September 2016.

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As the available balance is reduced by commercial paper borrowings and certain outstanding letters of credit, we had $619.3 million in available capacity under our $1.0 billion credit facility at May 5, 2012.

We also maintain a letter of credit facility that allows us to request the participating bank to issue letters of credit on our behalf up to an aggregate amount of $100 million. The letter of credit facility is in addition to the letters of credit that may be issued under the revolving credit facility. As of May 5, 2012, we have $98.7 million in letters of credit outstanding under the letter of credit facility, which expires in June 2013.

On April 24, 2012, we issued $500 million in 3.700% Senior Notes due April 2022 under our shelf registration statement filed with the Securities and Exchange Commission on April 17, 2012 (the “Shelf Registration”). The Shelf Registration allows us to sell an indeterminate amount in debt securities to fund general corporate purposes, including repaying, redeeming or repurchasing outstanding debt and for working capital, capital expenditures, new store openings, stock repurchases and acquisitions. Proceeds from the debt issuance on April 24, 2012, were used to repay a portion of the commercial paper borrowings and for general corporate purposes. On November 15, 2010, we issued $500 million in 4.000% Senior Notes due 2020 under a shelf registration statement filed with the Securities and Exchange Commission on July 29, 2008. We used the proceeds from the November 15, 2010 issuance of debt to repay the principal due relating to the 4.750% Senior Notes that matured on November 15, 2010, to repay a portion of the commercial paper borrowings and for general corporate purposes.

The 6.500% and 7.125% Senior Notes issued during August 2008, and the 5.750% Senior Notes issued in July 2009, are subject to an interest rate adjustment if the debt ratings assigned to the notes are downgraded. These notes, along with the 3.700% Senior Notes issued in April 2012 and the 4.000% Senior Notes issued in November 2010, also contain a provision that repayment of the notes may be accelerated if AutoZone experiences a change in control (as defined in the agreements). Our borrowings under our other senior notes contain minimal covenants, primarily restrictions on liens. Under our other borrowing arrangements, covenants include limitations on total indebtedness, restrictions on liens, a minimum fixed charge coverage ratio and a change of control provision that may require acceleration of the repayment obligations under certain circumstances. All of the repayment obligations under our borrowing arrangements may be accelerated and come due prior to the scheduled payment date if covenants are breached or an event of default occurs. As of May 5, 2012, we were in compliance with all covenants and expect to remain in compliance with all covenants.

Our adjusted debt to earnings before interest, taxes, depreciation, amortization, rent and share-based expense (“EBITDAR”) ratio was 2.5:1 as of May 5, 2012, and was 2.4:1 as of May 7, 2011. We calculate adjusted debt as the sum of total debt, capital lease obligations and rent times six; and we calculate EBITDAR by adding interest, taxes, depreciation, amortization, rent and share-based expenses to net income. Adjusted debt to EBITDAR is calculated on a trailing four quarter basis. We target our debt levels to a ratio of adjusted debt to EBITDAR in order to maintain our investment grade credit ratings. We believe this is important information for the management of our debt levels.

Stock Repurchases

From January 1, 1998 to May 5, 2012, we have repurchased a total of 129.9 million shares at an aggregate cost of $11.1 billion, including 2,510,029 shares of our common stock at an aggregate cost of $882.7 million during the thirty-six week period ended May 5, 2012. On March 7, 2012, the Board voted to increase the authorization by $750 million to raise the cumulative share repurchase authorization from $11.15 billion to $11.9 billion. Considering cumulative repurchases as of May 5, 2012, we have $835.9 million remaining under the Board’s authorization to repurchase our common stock. Subsequent to May 5, 2012, we have repurchased 893,910 shares of our common stock at an aggregate cost of $335.5 million.

Off-Balance Sheet Arrangements

Since our fiscal year end, we have cancelled, issued and modified stand-by letters of credit that are primarily renewed on an annual basis to cover deductible payments to our casualty insurance carriers. Our total stand-by letters of credit commitment at May 5, 2012, was $102.3 million compared with $96.6 million at August 27, 2011, and our total surety bonds commitment at May 5, 2012, was $32.7 million compared with $26.3 million at August 27, 2011.

Financial Commitments

As of May 5, 2012, there were no significant changes to our contractual obligations as described in our Annual Report on Form 10-K for the year ended August 27, 2011.

Reconciliation of Non-GAAP Financial Measures

Management’s Discussion and Analysis of Financial Condition and Results of Operations include certain financial measures not derived in accordance with U.S. generally accepted accounting principles (“GAAP”). These non-GAAP financial measures provide additional information for determining our optimum capital structure and are used to assist management in evaluating performance and in making appropriate business decisions to maximize stockholders’ value.

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Non-GAAP financial measures should not be used as a substitute for GAAP financial measures, or considered in isolation, for the purpose of analyzing our operating performance, financial position or cash flows. However, we have presented the non-GAAP financial measures, as we believe they provide additional information that is useful to investors. Furthermore, our management and the Compensation Committee of the Board use the abovementioned non-GAAP financial measures to analyze and compare our underlying operating results and to determine payments of performance-based compensation. We have included a reconciliation of this information to the most comparable GAAP measures in the following reconciliation tables.

Reconciliation of Non-GAAP Financial Measure: After-Tax Return on Invested Capital “ROIC”

The following tables calculate the percentages of ROIC for the trailing four quarters ended May 5, 2012 and May 7, 2011.

	A			B			A-B=C			D			C+D
(in thousands, except percentage)	Fiscal Year Ended August 27, 2011			Thirty-Six Weeks Ended May  7, 2011			Sixteen Weeks Ended August 27, 2011			Thirty-Six Weeks Ended May  5, 2012			Trailing Four Quarters Ended May 5, 2012
Net income	$	848,974		$	547,505		$	301,469		$	606,641		$	908,110
Adjustments:
Interest expense		170,557			116,745			53,812			117,760			171,572
Rent expense		213,846			147,252			66,594			158,109			224,703
Tax effect(1)		(138,792	)		(95,318	)		(43,474	)		(99,605	)		(143,079	)
After-tax return	$	1,094,585		$	716,184		$	378,401		$	782,905		$	1,161,306
Average debt(2)													$	3,399,491
Average deficit(3)														(1,286,645	)
Rent x 6(4)														1,348,218
Average capital lease obligations(5)														92,181
Pre-tax invested capital													$	3,553,245
ROIC														32.7	%
	A			B			A-B=C			D			C+D
(in thousands, except percentage)	Fiscal Year Ended August 28, 2010			Thirty-Six Weeks Ended May  8, 2010			Sixteen Weeks Ended August 28, 2010			Thirty-Six Weeks Ended May  7, 2011			Trailing Four Quarters Ended May 7, 2011
Net income	$	738,311		$	469,378		$	268,933		$	547,505		$	816,438
Adjustments:
Interest expense		158,909			109,483			49,426			116,745			166,171
Rent expense		195,632			133,560			62,072			147,252			209,324
Tax effect(1)		(127,989	)		(87,739	)		(40,250	)		(95,303	)		(135,553	)
After-tax return	$	964,863		$	624,682		$	340,181		$	716,199		$	1,056,380
Average debt(2)													$	2,991,244
Average deficit(3)														(835,167	)
Rent x 6(4)														1,255,944
Average capital lease obligations(5)														80,302
Pre-tax invested capital													$	3,492,323
ROIC														30.2	%

(1) The effective tax rate over the trailing four quarters ended May 5, 2012 and May 7, 2011 is 36.1%, respectively.

(2) Average debt is equal to the average of our debt measured as of the previous five quarters.

(3) Average equity is equal to the average of our stockholders’ deficit measured as of the previous five quarters.

(4) Rent is multiplied by a factor of six to capitalize operating leases in the determination of pre-tax invested capital.

(5) Average capital lease obligations are equal to the average of our capital lease obligations measured as of the previous five quarters.

18

Reconciliation of Non-GAAP Financial Measure: Adjusted Debt to Earnings before Interest, Taxes, Depreciation, Rent and Share-Based Expense “EBITDAR”

The following tables calculate the ratio of adjusted debt to EBITDAR for the trailing four quarters ended May 5, 2012 and May 7, 2011.

	A		B		A-B=C		D		C+D
(in thousands, except ratio)	Fiscal Year Ended August 27, 2011		Thirty-Six Weeks Ended May  7, 2011		Sixteen Weeks Ended August 27, 2011		Thirty-Six Weeks Ended May  5, 2012		Trailing Four Quarters Ended May 5, 2012
Net income	$	848,974	$	547,505	$	301,469	$	606,641	$	908,110
Add: Interest expense		170,557		116,745		53,812		117,760		171,572
Income tax expense		475,272		306,544		168,728		344,434		513,162
EBIT		1,494,803		970,794		524,009		1,068,835		1,592,844
Add: Depreciation expense		196,209		133,347		62,862		145,177		208,039
Rent expense		213,846		147,252		66,594		158,109		224,703
Share-based expense		26,625		18,482		8,143		23,872		32,015
EBITDAR	$	1,931,483	$	1,269,875	$	661,608	$	1,395,993	$	2,057,601
Debt									$	3,606,309
Capital lease obligations										100,687
Add: Rent x 6(1)										1,348,218
Adjusted debt									$	5,055,214
Adjusted debt / EBITDAR										2.5
	A		B		A-B=C		D		C+D
(in thousands, except ratio)	Fiscal Year Ended August 28, 2010		Thirty-Six Weeks Ended May  8, 2010		Sixteen Weeks Ended August 28, 2010		Thirty-Six Weeks Ended May  7, 2011		Trailing Four Quarters Ended May 7, 2011
Net income	$	738,311	$	469,378	$	268,933	$	547,505	$	816,438
Add: Interest expense		158,909		109,483		49,426		116,745		166,171
Income tax expense		422,194		267,814		154,380		306,544		460,924
EBIT		1,319,414		846,675		472,739		970,794		1,443,533
Add: Depreciation expense		192,084		129,918		62,166		133,347		195,513
Rent expense		195,632		133,560		62,072		147,252		209,324
Share-based expense		19,120		13,215		5,905		18,482		24,387
EBITDAR	$	1,726,250	$	1,123,368	$	602,882	$	1,269,875	$	1,872,757
Debt									$	3,220,786
Capital lease obligations										83,027
Add: Rent x 6(1)										1,255,944
Adjusted debt									$	4,559,757
Adjusted debt / EBITDAR										2.4

(1) Rent is multiplied by a factor of six to capitalize operating leases in the determination of adjusted debt.

Recent Accounting Pronouncements

In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income, which amends Accounting Standards Codification (“ASC”) Topic 220, Comprehensive Income. The purpose of ASU 2011-12 is to defer the effective date pertaining to reclassification adjustments out of accumulated other comprehensive income in ASU 2011-05, Presentation of Comprehensive Income, until the FASB is able to reconsider operational concerns related to ASU 2011-05. All other requirements in ASU 2011-05 are not affected by ASU 2011-12, including the requirement to report comprehensive income either in a single continuous financial statement or in two separate but consecutive financial statements. We do not expect the provisions of ASU 2011-05 or ASU 2011-12 to have a material impact to our consolidated financial statements. Both ASU 2011-05 and ASU 2011-12 will be effective for our fiscal year ending August 31, 2013, including interim periods within that year.

19

Critical Accounting Policies

Preparation of our consolidated financial statements requires us to make estimates and assumptions affecting the reported amounts of assets and liabilities at the date of the financial statements, reported amounts of revenues and expenses during the reporting period and related disclosures of contingent liabilities. Our policies are evaluated on an ongoing basis, and our significant judgments and estimates are drawn from historical experience and other assumptions that we believe to be reasonable under the circumstances. Actual results could differ under different assumptions or conditions.

Our critical accounting policies are described in Management’s Discussion and Analysis of Financial Condition and Results of Operations in our Annual Report on Form 10-K for the year ended August 27, 2011. Our critical accounting policies have not changed since the filing of our Annual Report on Form 10-K for the year ended August 27, 2011.

Forward-Looking Statements

Certain statements contained in this Quarterly Report on Form 10-Q are forward-looking statements. Forward-looking statements typically use words such as “believe,” “anticipate,” “should,” “intend,” “plan,” “will,” “expect,” “estimate,” “project,” “positioned,” “strategy” and similar expressions. These are based on assumptions and assessments made by our management in light of experience and perception of historical trends, current conditions, expected future developments and other factors that we believe to be appropriate. These forward-looking statements are subject to a number of risks and uncertainties, including without limitation: credit market conditions; the impact of recessionary conditions; competition; product demand; the ability to hire and retain qualified employees; consumer debt levels; inflation; weather; raw material costs of our suppliers; energy prices; war and the prospect of war, including terrorist activity; construction delays; access to available and feasible financing; and changes in laws or regulations. Certain of these risks are discussed in more detail in the “Risk Factors” section contained in Item 1A under Part 1 of our Annual Report on Form 10-K for the year ended August 27, 2011, and these Risk Factors should be read carefully. Forward-looking statements are not guarantees of future performance and actual results; developments and business decisions may differ from those contemplated by such forward-looking statements, and events described above and in the “Risk Factors” could materially and adversely affect our business. Forward-looking statements speak only as of the date made. Except as required by applicable law, we undertake no obligation to update publicly any forward-looking statements, whether as a result of new information, future events or otherwise. Actual results may materially differ from anticipated results.

Item 3. Quantitative and Qualitative Disclosures About Market Risk.

At May 5, 2012, there have been no material changes to our instruments and positions that are sensitive to market risk since the disclosures in our Annual Report on Form 10-K for the year ended August 27, 2011, except as described below.

The fair value of our debt was estimated at $3.896 billion as of May 5, 2012, and $3.633 billion as of August 27, 2011, based on the quoted market prices for the same or similar debt issues or on the current rates available to AutoZone for debt of the same terms. Such fair value is greater than the carrying value of debt by $289.7 million at May 5, 2012 and $281.0 million at August 27, 2011. We had $356.3 million of variable rate debt outstanding at May 5, 2012, and $601.7 million of variable rate debt outstanding at August 27, 2011. At these borrowing levels for variable rate debt, a one percentage point increase in interest rates would have had an unfavorable annual impact on our pre-tax earnings and cash flows of $3.6 million in fiscal 2012. The primary interest rate exposure on variable rate debt is based on LIBOR. We had outstanding fixed rate debt of $3.250 billion at May 5, 2012, and $2.750 billion at August 27, 2011. A one percentage point increase in interest rates would reduce the fair value of our fixed rate debt by $147.7 million at May 5, 2012.

Item 4. Controls and Procedures.

As of May 5, 2012, an evaluation was performed under the supervision and with the participation of our management, including the Chief Executive Officer and Chief Financial Officer, of the effectiveness of the design and operation of our disclosure controls and procedures, as defined in Rules 13a-15(e) and 15d-15(e) under the Exchange Act, as amended. Based on that evaluation, our management, including the Chief Executive Officer and Chief Financial Officer, concluded that our disclosure controls and procedures were effective as of May 5, 2012. During or subsequent to the quarter ended May 5, 2012, there were no changes in our internal controls that have materially affected or are reasonably likely to materially affect, internal controls over financial reporting.

Item 4T. Controls and Procedures.

Not applicable.

20

PART II. OTHER INFORMATION

Item 1. Legal Proceedings.

We were a defendant in a lawsuit entitled “Coalition for a Level Playing Field, L.L.C., et al., v. AutoZone, Inc. et al.,” filed in the U.S. District Court for the Southern District of New York in October 2004. The case was filed by more than 200 plaintiffs, which are principally automotive aftermarket warehouse distributors and jobbers, against a number of defendants, including automotive aftermarket retailers and aftermarket automotive parts manufacturers. The plaintiffs alleged, inter alia, that some or all of the automotive aftermarket retailer defendants including AutoZone had knowingly received, in violation of the Robinson-Patman Act, from various of the manufacturer defendants benefits such as volume discounts, rebates, early buy allowances and other allowances, fees, and other payments including sham advertising and promotional payments that were not available to Plaintiffs.

In an order issued on September 16, 2010, the court granted motions to dismiss all claims against AutoZone and its co-defendant competitors and suppliers. The court ordered the case closed, but allowed plaintiffs to move for leave to file a third amended complaint. In an order dated September 28, 2011, the court denied the plaintiffs’ motion for leave to file a third amended complaint because the proposed third amended complaint failed to address deficiencies previously identified by the court. On October 26, 2011, plaintiffs filed an appeal of the dismissal in the U.S. Court of Appeals for the Second Circuit. Following mediation, on March 23, 2012, all parties settled the case pursuant to a confidential settlement agreement. On April 5, 2012, the case was withdrawn with prejudice from the U.S. Court of Appeals for the Second Circuit. On April 11, 2012, the case was dismissed with prejudice by the U.S. District Court for the Southern District of New York.

In 2004, we acquired a store site in Mount Ephraim, New Jersey that had previously been the site of a gasoline service station and contained evidence of groundwater contamination. Upon acquisition, we voluntarily reported the groundwater contamination issue to the New Jersey Department of Environmental Protection and entered into a Voluntary Remediation Agreement providing for the remediation of the contamination associated with the property. We have conducted and paid for (at an immaterial cost to us) remediation of visible contamination on the property and are investigating, and will be addressing, potential vapor intrusion impacts in downgradient residences and businesses. The New Jersey Department of Environmental Protection has indicated that it will assert that we are liable for the downgradient impacts under a joint and severable liability theory, and we intend to contest any such assertion. Pursuant to the Voluntary Remediation Agreement, upon completion of all remediation required by the agreement, we believe it should be eligible to be reimbursed up to 75 percent of qualified remediation costs by the State of New Jersey. We have asked the state for clarification that the agreement applies to off-site work, and the state is considering the request. Although the aggregate amount of additional costs that we may incur pursuant to the remediation cannot currently be ascertained, we do not currently believe that fulfillment of its obligations under the agreement or otherwise will result in costs that are material to its financial condition, results of operations or cash flow.

We are involved in various other legal proceedings incidental to the conduct of our business, including several lawsuits containing class-action allegations in which the plaintiffs are current and former hourly and salaried employees who allege various wage and hour violations and unlawful termination practices. We do not currently believe that, either individually or in the aggregate, these matters will result in liabilities material to our financial condition, results of operations or cash flows.

Item 1A. Risk Factors.

As of the date of this filing, there have been no material changes in our risk factors from those disclosed in Part I, Item 1A, of our Annual Report on Form 10-K for the fiscal year ended August 27, 2011.

Item 2. Unregistered Sales of Equity Securities and Use of Proceeds.

Shares of common stock repurchased by the Company during the quarter ended May 5, 2012, were as follows:

Issuer Repurchases of Equity Securities

Period	Total Number of Shares Purchased		Average Price Paid per Share		Total Number of Shares Purchased as Part of Publicly Announced Plans or Programs		Maximum Dollar Value that May Yet Be Purchased Under the Plans or Programs
February 12, 2012 to March 10, 2012		26,240	$	381.09		26,240	$	1,226,357,062
March 11, 2012 to April 7, 2012		596,123		378.43		596,123		1,000,767,275
April 8, 2012 to May 5, 2012		432,620		381.09		432,620		835,901,241
Total		1,054,983	$	379.58		1,054,983	$	835,901,241

During 1998, the Company announced a program permitting the Company to repurchase a portion of its outstanding shares not to exceed a dollar maximum established by the Company’s Board of Directors. The program was most recently amended on March 7, 2012, to increase the repurchase authorization to $11.9 billion from $11.15 billion and does not have an expiration date. All of the above repurchases were part of this program. Subsequent to May 5, 2012, the Company has repurchased 893,910 shares of its common stock at an aggregate cost of $335.5 million.

21

Item 3. Defaults Upon Senior Securities.

Not applicable.

Item 4. Mine Safety Disclosures

Not applicable.

Item 5. Other Information.

Not applicable.

22

Item 6. Exhibits.

The following exhibits are filed as part of this report:

3.1	Restated Articles of Incorporation of AutoZone, Inc. incorporated by reference to Exhibit 3.1 to the Quarterly Report on Form 10-Q for the quarter ended February 13, 1999.
3.2	Fifth Amended and Restated By-laws of AutoZone, Inc. incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K dated September 28, 2011.
4.1	Officers’ Certificate dated April 24, 2012, pursuant to section 3.2 of the indenture dated August 8, 2003, setting forth the terms of the 3.700% Senior Notes due 2022. Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K dated April 24, 2012.
4.2	Form of 3.700% Senior Notes due 2022. Incorporated by reference from the Form 8-K dated April 24, 2012.
12.1	Computation of Ratio of Earnings to Fixed Charges.
15.1	Letter Regarding Unaudited Interim Financial Statements.
31.1	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
**101.INS	XBRL Instance Document
**101.SCH	XBRL Taxonomy Extension Schema Document
**101.CAL	XBRL Taxonomy Extension Calculation Document
**101.LAB	XBRL Taxonomy Extension Labels Document
**101.PRE	XBRL Taxonomy Extension Presentation Document
**101.DEF	XBRL Taxonomy Extension Definition Document

* Management contract or compensatory plan or arrangement.

** In accordance with Regulation S-T, the Interactive Data Files in Exhibit 101 to the Quarterly Report on Form 10-Q shall be deemed “furnished” and not “filed.”

23

SIGNATURES

Pursuant to the requirements of the Securities Exchange Act of 1934, the registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

AUTOZONE, INC.
By:	/s/ WILLIAM T. GILES
William T. Giles
Chief Financial Officer, Executive Vice President,
Finance, Information Technology and Store Development
(Principal Financial Officer)
By:	/s/ CHARLIE PLEAS, III
Charlie Pleas, III
Senior Vice President, Controller
(Principal Accounting Officer)

Dated: June 13, 2012

24

EXHIBIT INDEX

The following exhibits are filed as part of this report:

3.1	Restated Articles of Incorporation of AutoZone, Inc. incorporated by reference to Exhibit 3.1 to the Quarterly Report on Form 10-Q for the quarter ended February 13, 1999.
3.2	Fifth Amended and Restated By-laws of AutoZone, Inc. incorporated by reference to Exhibit 3.1 to the Current Report on Form 8-K dated September 28, 2011.
4.1	Officers’ Certificate dated April 24, 2012, pursuant to section 3.2 of the indenture dated August 8, 2003, setting forth the terms of the 3.700% Senior Notes due 2022. Incorporated by reference to Exhibit 4.1 to the Current Report on Form 8-K dated April 24, 2012.
4.2	Form of 3.700% Senior Notes due 2022. Incorporated by reference from the Form 8-K dated April 24, 2012.
12.1	Computation of Ratio of Earnings to Fixed Charges.
15.1	Letter Regarding Unaudited Interim Financial Statements.
31.1	Certification of Principal Executive Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Principal Financial Officer Pursuant to Rules 13a-14(a) and 15d-14(a) under the Securities Exchange Act of 1934, as adopted pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Principal Executive Officer Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Principal Financial Officer Pursuant to 18 U.S.C. Section 1350 as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
**101.INS	XBRL Instance Document
**101.SCH	XBRL Taxonomy Extension Schema Document
**101.CAL	XBRL Taxonomy Extension Calculation Document
**101.LAB	XBRL Taxonomy Extension Labels Document
**101.PRE	XBRL Taxonomy Extension Presentation Document
**101.DEF	XBRL Taxonomy Extension Definition Document

* Management contract or compensatory plan or arrangement.

** In accordance with Regulation S-T, the Interactive Data Files in Exhibit 101 to the Quarterly Report on Form 10-Q shall be deemed “furnished” and not “filed.”

25

EX-12.1

Exhibit 12.1

Computation of Ratio of Earnings to Fixed Charges

(Unaudited)

(in thousands, except ratios)

	Thirty-Six Weeks Ended
	May 5, 2012			May 7, 2011
Earnings:
Income before income taxes	$	951,075		$	854,049
Fixed charges		168,716			164,752
Less: Capitalized interest		(668	)		(532	)
Adjusted earnings	$	1,119,123		$	1,018,269
Fixed charges:
Gross interest expense	$	114,008		$	112,794
Amortization of debt expense		5,426			6,060
Interest portion of rent expense		49,282			45,898
Fixed charges	$	168,716		$	164,752
Ratio of earnings to fixed charges		6.6			6.2

	Fiscal Year Ended August
	2011 (52 weeks)			2010 (52 weeks)			2009 (52 weeks)			2008 (53 weeks)			2007 (52 weeks)
Earnings:
Income before income taxes	$	1,324,246		$	1,160,505		$	1,033,746		$	1,007,389		$	936,150
Fixed charges		240,329			223,608			204,017			173,311			170,852
Less: Capitalized interest		(1,059	)		(1,093	)		(1,301	)		(1,313	)		(1,376	)
Adjusted earnings	$	1,563,516		$	1,383,020		$	1,236,462		$	1,179,387		$	1,105,626
Fixed charges:
Gross interest expense	$	164,712		$	156,135		$	143,860		$	120,006		$	121,592
Amortization of debt expense		8,962			6,495			3,644			1,837			1,719
Interest portion of rent expense		66,655			60,978			56,513			51,468			47,541
Fixed charges	$	240,329		$	223,608		$	204,017		$	173,311		$	170,852
Ratio of earnings to fixed charges		6.5			6.2			6.1			6.8			6.5

EX-15.1

Exhibit 15.1

The Board of Directors and Stockholders

AutoZone, Inc.

We are aware of the incorporation by reference in the following Registration Statements of AutoZone, Inc. and in the related Prospectuses of our report dated June 13, 2012, related to the unaudited condensed consolidated financial statements of AutoZone, Inc. that are included in its Quarterly Report on Form 10-Q for the quarter ended May 5, 2012:

Registration Statement (Form S-8 No. 333-19561) pertaining to the AutoZone, Inc. 1996 Stock Option Plan

Registration Statement (Form S-8 No. 333-42797) pertaining to the AutoZone, Inc. Amended and Restated Employee Stock Purchase Plan

Registration Statement (Form S-8 No. 333-48981) pertaining to the AutoZone, Inc. 1998 Director Stock Option Plan

Registration Statement (Form S-8 No. 333-48979) pertaining to the AutoZone, Inc. 1998 Director Compensation Plan

Registration Statement (Form S-8 No. 333-88245) pertaining to the AutoZone, Inc. Second Amended and Restated 1996 Stock Option Plan

Registration Statement (Form S-8 No. 333-88243) pertaining to the AutoZone, Inc. Amended and Restated 1998 Director Stock Option Plan

Registration Statement (Form S-8 No. 333-88241) pertaining to the AutoZone, Inc. Amended and Restated Director Compensation Plan

Registration Statement (Form S-8 No. 333-75142) pertaining to the AutoZone, Inc. Third Amended and Restated 1998 Director Stock Option Plan

Registration Statement (Form S-8 No. 333-75140) pertaining to the AutoZone, Inc. Executive Stock Purchase Plan

Registration Statement (Form S-3 No. 333-83436) pertaining to a shelf registration to sell 15,000,000 shares of common stock owned by certain selling stockholders

Registration Statement (Form S-3 No. 333-100205) pertaining to a registration to sell $500 million of debt securities

Registration Statement (Form S-8 No. 333-103665) pertaining to the AutoZone, Inc. 2003 Director Compensation Plan

Registration Statement (Form S-8 No. 333-103666) pertaining to the AutoZone, Inc. 2003 Director Stock Option Plan

Registration Statement (Form S-3 No. 333-107828) pertaining to a registration to sell $500 million of debt securities

Registration Statement (Form S-3 No. 333-118308) pertaining to the registration to sell $200 million of debt securities

Registration Statement (Form S-8 No. 333-139559) pertaining to the AutoZone, Inc. 2006 Stock Option Plan

Registration Statement (Form S-3 No. 333-152592) pertaining to a shelf registration to sell debt securities

Registration Statement (Form S-8 No. 333-171186) pertaining to the AutoZone, Inc. 2011 Equity Incentive Award Plan

Registration Statement (Form S-3 No. 333-180768) pertaining to a shelf registration to sell debt securities

/s/ Ernst & Young LLP

Memphis, Tennessee

June 13, 2012

EX-31.1

Exhibit 31.1

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, William C. Rhodes, III, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of AutoZone, Inc. (“registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

June 13, 2012

/s/ WILLIAM C. RHODES, III

William C. Rhodes, III

Chairman, President and Chief Executive Officer

(Principal Executive Officer)

EX-31.2

Exhibit 31.2

CERTIFICATION PURSUANT TO

RULES 13a-14(a) AND 15d-14(a) UNDER THE SECURITIES EXCHANGE ACT OF 1934,

AS ADOPTED PURSUANT TO SECTION 302 OF THE SARBANES-OXLEY ACT OF 2002

I, William T. Giles, certify that:

1. I have reviewed this Quarterly Report on Form 10-Q of AutoZone, Inc. (“registrant”);

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

(a) designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

(b) designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

(c) evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

(d) disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

(a) all significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

(b) any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

June 13, 2012

/s/ WILLIAM T. GILES

William T. Giles

Chief Financial Officer, Executive Vice President,

Finance, Information Technology and Store Development

(Principal Financial Officer)

EX-32.1

Exhibit 32.1

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of AutoZone, Inc. (the “Company”) on Form 10-Q for the period ended May 5, 2012, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, William C. Rhodes, III, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(i) the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

June 13, 2012

/s/ WILLIAM C. RHODES, III

William C. Rhodes, III

Chairman, President and Chief Executive Officer

(Principal Executive Officer)

EX-32.2

Exhibit 32.2

CERTIFICATION PURSUANT TO

18 U.S.C. SECTION 1350, AS ADOPTED PURSUANT TO

SECTION 906 OF THE SARBANES-OXLEY ACT OF 2002

In connection with the Quarterly Report of AutoZone, Inc. (the “Company”) on Form 10-Q for the period ended May 5, 2012, as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, William T. Giles, certify, pursuant to 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(i) the Report fully complies with the requirements of Section 13(a) or Section 15(d) of the Securities Exchange Act of 1934; and

(ii) the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Company.

June 13, 2012

/s/ WILLIAM T. GILES

William T. Giles

Chief Financial Officer, Executive Vice President,

Finance, Information Technology and Store Development

(Principal Financial Officer)

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Litigation (Details)	9 Months Ended
	May 05, 2012
Litigation (Textual) [Abstract]
Number of Plaintiffs filed case	more than 200 plaintiffs
Maximum reimbursement percentage of qualified remediation cost	75.00%
Description of Reimbursement percentage of qualified remediation cost	up to 75 percent

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Merchandise Inventories (Details) (USD $) In Millions, unless otherwise specified	May 05, 2012	Aug. 27, 2011
Merchandise Inventories (Textual) [Abstract]
Unrecorded adjustment for LIFO value in excess of replacement value	$ 266.2	$ 253.3

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Segment Reporting (Tables)

3 Months Ended

May 05, 2012

Segment Reporting [Abstract]

Segment results

	Twelve Weeks Ended						Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011			May 5, 2012			May 7, 2011
Net Sales
Auto Parts Stores	$	2,068,643		$	1,939,094		$	5,715,683		$	5,318,031
Other		43,223			39,275			124,594			112,946
Total	$	2,111,866		$	1,978,369		$	5,840,277		$	5,430,977
Segment Profit
Auto Parts Stores	$	1,056,587		$	983,256		$	2,903,437		$	2,678,814
Other		33,212			30,274			96,204			88,075
Gross profit		1,089,799			1,013,530			2,999,641			2,766,889
Operating, selling, general and administrative expenses		(662,549	)		(620,605	)		(1,930,806	)		(1,796,095	)
Interest expense, net		(39,743	)		(39,916	)		(117,760	)		(116,745	)
Income before income taxes	$	387,507		$	353,009		$	951,075		$	854,049

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Stock Repurchase Program (Details) (USD $)	1 Months Ended		9 Months Ended		12 Months Ended	172 Months Ended
	Mar. 31, 2012	Sep. 28, 2011	May 05, 2012	May 07, 2011	Aug. 25, 2012	May 05, 2012	Mar. 07, 2012
Stock Repurchase Program (Textual) [Abstract]
Stock Repurchased During Period, Shares			2,510,029		893,910	129,900,000
Purchase of treasury stock			$ 882,700,000		$ 335,500,000	$ 11,100,000,000
Remaining Value Authorized For Share Repurchases			835,900,000			835,900,000
Stock repurchase authorized during the period, value							750,000,000
Stock repurchase authorized amended value	11,900,000,000	11,150,000,000
Treasury stock acquired repurchase authorization			From January 1, 1998 to May 5, 2012, the Company has repurchased a total of 129.9 million shares at an aggregate cost of $11.1 billion, including 2,510,029 shares of its common stock at an aggregate cost of $882.7 million during the thirty-six week period ended May 5, 2012. On March 7, 2012, the Board voted to increase the authorization by $750 million to raise the cumulative share repurchase authorization from $11.15 billion to $11.9 billion. Considering the cumulative repurchases as of May 5, 2012, the Company had $835.9 million remaining under the Board’s authorization to repurchase its common stock. Subsequent to May 5, 2012, the Company has repurchased 893,910 shares of its common stock at an aggregate cost of $335.5 million.
Shares of treasury stock retired			4,900,000	6,600,000
Retained deficit [Member]
Treasury stock retired, cost method			1,319,600,000	1,247,700,000
Additional Paid-in Capital [Member]
Treasury stock retired, cost method			$ 72,500,000	82,200,000

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Marketable Securities

3 Months Ended

May 05, 2012

Marketable Securities [Abstract]

Marketable Securities

Note D – Marketable Securities

The Company’s basis for determining the cost of a security sold is the “Specific Identification Model”. Unrealized gains (losses) on marketable securities are recorded in Accumulated other comprehensive loss. The Company’s available-for-sale marketable securities consisted of the following:

	May 5, 2012
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	24,930	$	234	$	(5	)	$	25,159
Government bonds		27,792		184		(3	)		27,973
Mortgage-backed securities		4,868		26		(4	)		4,890
Asset-backed securities and other		18,628		94		—			18,722
	$	76,218	$	538	$	(12	)	$	76,744
	August 27, 2011
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	26,261	$	229	$	(45	)	$	26,445
Government bonds		29,464		343		—			29,807
Mortgage-backed securities		4,291		55		—			4,346
Asset-backed securities and other		12,377		156		—			12,533
	$	72,393	$	783	$	(45	)	$	73,131

The debt securities held at May 5, 2012, had effective maturities ranging from less than one year to approximately 3 years. The Company did not realize any material gains or losses on its marketable securities during the thirty-six week period ended May 5, 2012.

The Company holds eight securities that are in an unrealized loss position of approximately $12 thousand at May 5, 2012. 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 credit worthiness of the investee, the term to maturity and the intent and ability to hold the investments until maturity or until recovery of fair value.

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Fair Value Measurements (Details) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	May 05, 2012	Aug. 27, 2011
Company's assets and liabilities measured at fair value on a recurring basis
Other current assets	$ 5,542	$ 11,872
Other long-term assets	71,202	61,259
Total	76,744	73,131
Level 1 [Member]
Company's assets and liabilities measured at fair value on a recurring basis
Other current assets	5,542	11,872
Other long-term assets	60,394	55,390
Total	65,936	67,262
Level 2 [Member]
Company's assets and liabilities measured at fair value on a recurring basis
Other current assets	0	0
Other long-term assets	10,808	5,869
Total	10,808	5,869
Level 3 [Member]
Company's assets and liabilities measured at fair value on a recurring basis
Other current assets	0	0
Other long-term assets	0	0
Total	$ 0	$ 0

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Share-Based Payments (Details Textual) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 05, 2012	May 07, 2011	May 05, 2012	May 07, 2011
Share-Based Payments (Textual) [Abstract]
Total share-based expense related to stock options and share purchase plans	$ 8.8	$ 6.4	$ 23.9	$ 18.5
Stock options exercised - Shares			467,644	436,394
Stock options exercised - Weighted average exercise price	$ 110.13	$ 99.87	$ 110.13	$ 99.87
Stock options granted			377,130	424,780
Weighted average grant date fair value of options granted			$ 93.42	$ 58.58
Anti-dilutive shares excluded from the computation of earnings per share	0	0	1,500	1,260

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Fair Value Measurements (Details Textual) (Fair Value, Measurements, Recurring [Member], USD $) In Thousands, unless otherwise specified	May 05, 2012	Aug. 27, 2011
Fair Value, Measurements, Recurring [Member]
Fair Value Measurements (Textual) [Abstract]
Short-term marketable securities	$ 5,542	$ 11,872
Long term marketable securities	$ 71,202	$ 61,259

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Marketable Securities (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 05, 2012 SecuritiesHold	Aug. 27, 2011
Available-for-sale marketable securities
Available-For-Sale Marketable Securities, Amortized Cost Basis	$ 76,218	$ 72,393
Available-For-Sale Marketable Securities, Gross Unrealized Gains	538	783
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(12)	(45)
Available-For-Sale Marketable Securities, Fair Value	76,744	73,131
Marketable Securities (Textual) [Abstract]
Available for sale securities debt maturity period range	Less than one year to approximately 3 years
Number of securities held in unrealized loss position	8
Available for sale securities in continuous unrealized loss position amount	(12)
Corporate securities [Member]
Available-for-sale marketable securities
Available-For-Sale Marketable Securities, Amortized Cost Basis	24,930	26,261
Available-For-Sale Marketable Securities, Gross Unrealized Gains	234	229
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(5)	(45)
Available-For-Sale Marketable Securities, Fair Value	25,159	26,445
Government bonds [Member]
Available-for-sale marketable securities
Available-For-Sale Marketable Securities, Amortized Cost Basis	27,792	29,464
Available-For-Sale Marketable Securities, Gross Unrealized Gains	184	343
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(3)	0
Available-For-Sale Marketable Securities, Fair Value	27,973	29,807
Mortgage-backed securities [Member]
Available-for-sale marketable securities
Available-For-Sale Marketable Securities, Amortized Cost Basis	4,868	4,291
Available-For-Sale Marketable Securities, Gross Unrealized Gains	26	55
Available-For-Sale Marketable Securities, Gross Unrealized Losses	(4)	0
Available-For-Sale Marketable Securities, Fair Value	4,890	4,346
Asset-Backed securities and other [Member]
Available-for-sale marketable securities
Available-For-Sale Marketable Securities, Amortized Cost Basis	18,628	12,377
Available-For-Sale Marketable Securities, Gross Unrealized Gains	94	156
Available-For-Sale Marketable Securities, Gross Unrealized Losses	0	0
Available-For-Sale Marketable Securities, Fair Value	$ 18,722	$ 12,533

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Fair Value Measurements

3 Months Ended

May 05, 2012

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.

Financial Assets & Liabilities Measured at Fair Value on a Recurring Basis

The Company’s assets and liabilities measured at fair value on a recurring basis were as follows:

	May 5, 2012
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	5,542	$	—	$	—	$	5,542
Other long-term assets		60,394		10,808		—		71,202
	$	65,936	$	10,808	$	—	$	76,744
	August 27, 2011
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	11,872	$	—	$	—	$	11,872
Other long-term assets		55,390		5,869		—		61,259
	$	67,262	$	5,869	$	—	$	73,131

At May 5, 2012, the fair value measurement amounts for assets and liabilities recorded in the accompanying Condensed Consolidated Balance Sheet consisted of short-term marketable securities of $5.5 million, which are included within Other current assets, and long-term marketable securities of $71.2 million, which are included in Other long-term assets. The Company’s marketable securities are typically valued at the closing price in the principal active market as of the last business day of the quarter or through the use of other market inputs relating to the securities, including benchmark yields and reported trades. The fair values of the marketable securities, by asset class, are described in “Note D – Marketable Securities”.

Non-Financial Assets measured at Fair Value on a Non-Recurring Basis

Non-financial assets could be required to be measured at fair value on a non-recurring basis in certain circumstances, including the event of impairment. The assets could include assets acquired in an acquisition as well as property, plant and equipment that are determined to be impaired. During the thirty-six week periods ended May 5, 2012 and May 7, 2011, the Company did not have any significant non-financial assets measured at fair value on a non-recurring basis in periods subsequent to initial recognition.

Financial Instruments not Recognized at Fair Value

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 H – Financing”.

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Derivative Financial Instruments (Details) (USD $)	3 Months Ended	9 Months Ended			1 Months Ended							9 Months Ended
	Nov. 20, 2010 Forward_StartingSwap	May 05, 2012 TreasuryRate_Locks	May 07, 2011	Nov. 01, 2012 Subsequent Event [Member]	Nov. 30, 2010 Losses on three expired interest rate swaps [Member]	Nov. 20, 2010 Forward Starting Swap, One [Member]	Nov. 20, 2010 Forward Starting Swap, Two [Member]	Nov. 20, 2010 Forward Starting Swap, Three [Member]	May 05, 2012 Treasury Rate Lock, One [Member]	May 05, 2012 Treasury Rate Lock, Two [Member]	May 05, 2012 Treasury Rate Lock, Two [Member] Subsequent Event [Member]	May 05, 2012 Treasury Rate Lock [Member]	May 05, 2012 Treasury Rate Lock [Member] Subsequent Event [Member]	May 05, 2012 Treasury Rate Lock [Member] Loss on two expired treasury rate locks [Member]
Derivative [Line Items]
Notional amount of forward swaps				$ 100,000,000		$ 150,000,000	$ 150,000,000	$ 100,000,000	$ 300,000,000	$ 100,000,000	$ 100,000,000
Fixed rates of the hedges based on LIBOR				2.07%		3.15%	3.13%	2.57%	2.09%	2.07%	1.92%
Losses recognized in OCI upon expiration of swaps					11,700,000									2,800,000
Ineffective portion recognized of forward starting swaps	0											0
Treasury rate lock agreement, expiration date													Nov. 01, 2012
Derivative Financial Instruments (Textual) [Abstract]
Number of treasury rate locks		2
Number of forward starting swaps	3
Senior notes issued during period	500,000,000	500,000,000	500,000,000
Senior notes debt issuance	500,000,000
Derivative description of terms	The swaps were benchmarked based on the 3-month London InterBank Offered Rate.	The locks were benchmarked based on the 10-year U.S. treasury notes
Derivative instrument, variable interest rate months of LIBOR	3 months
Derivative instrument, variable interest rate years		10 years
Accumulated other comprehensive loss related to net unrealized gain (loss), net of tax		5,400,000
Net realized losses associated with terminated interest derivatives reclassified from accumulated other comprehensive loss to interest expense		1,200,000	858,000
Expected losses reclassified to interest expense		$ 1,700,000

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Segment Reporting (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 05, 2012 Store	May 07, 2011	May 05, 2012 ReportableSegment OperatingSegment Store	May 07, 2011
Net Sales
Net sales	$ 2,111,866	$ 1,978,369	$ 5,840,277	$ 5,430,977
Segment Profit
Gross profit	1,089,799	1,013,530	2,999,641	2,766,889
Operating, selling, general and administrative expenses	(662,549)	(620,605)	(1,930,806)	(1,796,095)
Interest expense, net	(39,743)	(39,916)	(117,760)	(116,745)
Income before income taxes	387,507	353,009	951,075	854,049
Segment Reporting (Textual) [Abstract]
Number of operating segments			2
Number of reportable segments			1
Number of automotive parts and accessories stores in the United States, including Puerto Rico and Mexico	4,910		4,910
Auto Parts Stores [Member]
Net Sales
Net sales	2,068,643	1,939,094	5,715,683	5,318,031
Segment Profit
Gross profit	1,056,587	983,256	2,903,437	2,678,814
Other [Member]
Net Sales
Net sales	43,223	39,275	124,594	112,946
Segment Profit
Gross profit	$ 33,212	$ 30,274	$ 96,204	$ 88,075

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Condensed Consolidated Balance Sheets (Unaudited) (USD $) In Thousands, unless otherwise specified	May 05, 2012	Aug. 27, 2011
Current assets:
Cash and cash equivalents	$ 103,100	$ 97,606
Accounts receivable	133,941	140,690
Merchandise inventories	2,629,821	2,466,107
Other current assets	77,410	88,022
Total current assets	2,944,272	2,792,425
Property and equipment:
Property and equipment	4,565,947	4,371,872
Less: Accumulated depreciation and amortization	(1,798,849)	(1,702,997)
Property and equipment, net	2,767,098	2,668,875
Goodwill	302,645	302,645
Deferred income taxes	22,390	10,661
Other long-term assets	112,449	94,996
Other long-term assets, total	437,484	408,302
Assets	6,148,854	5,869,602
Current liabilities:
Accounts payable	2,866,580	2,755,853
Accrued expenses and other	443,161	449,327
Income taxes payable	80,718	25,185
Deferred income taxes	169,625	166,449
Short-term borrowings	7,309	34,082
Total current liabilities	3,567,393	3,430,896
Long-term debt	3,599,000	3,317,600
Other long-term liabilities	399,290	375,338
Commitments and contingencies
Stockholders' deficit:
Preferred stock, authorized 1,000 shares; no shares issued
Common stock, par value $.01 per share, authorized 200,000 shares; 39,624 shares issued and 38,069 shares outstanding as of May 5, 2012; 44,084 shares issued and 40,109 shares outstanding as of August 27, 2011	396	441
Additional paid-in capital	629,322	591,384
Retained deficit	(1,356,930)	(643,998)
Accumulated other comprehensive loss	(116,657)	(119,691)
Treasury stock, at cost	(572,960)	(1,082,368)
Total stockholders' deficit	(1,416,829)	(1,254,232)
Liabilities and Stockholders' Deficit	$ 6,148,854	$ 5,869,602

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General

3 Months Ended

May 05, 2012

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 of the Securities and Exchange Commission’s (the “SEC”) rules and regulations. 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 related notes included in the AutoZone, Inc. (“AutoZone” or the “Company”) Annual Report on Form 10-K for the year ended August 27, 2011.

Operating results for the twelve and thirty-six weeks ended May 5, 2012, are not necessarily indicative of the results that may be expected for the fiscal year ending August 25, 2012. 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 quarters for fiscal 2011 and fiscal 2012 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.

Recent Accounting Pronouncements: In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income, which amends Accounting Standards Codification (“ASC”) Topic 220, Comprehensive Income. The purpose of ASU 2011-12 is to defer the effective date pertaining to reclassification adjustments out of accumulated other comprehensive income in ASU 2011-05, Presentation of Comprehensive Income, until the FASB is able to reconsider operational concerns related to ASU 2011-05. All other requirements in ASU 2011-05 are not affected by ASU 2011-12, including the requirement to report comprehensive income either in a single continuous financial statement or in two separate but consecutive financial statements. The Company does not expect the provisions of ASU 2011-05 or ASU 2011-12 to have a material impact on the consolidated financial statements. Both ASU 2011-05 and ASU 2011-12 will be effective for the Company’s fiscal year ending August 31, 2013, including interim periods within that year.

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Financing (Details) (USD $) In Thousands, unless otherwise specified	May 05, 2012	Aug. 27, 2011
The Company's long-term debt consisted of the following:
Long-term debt	$ 3,599,000	$ 3,317,600
5.875% Senior Notes due October 2012, effective interest rate of 6.33% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	300,000	300,000
4.375% Senior Notes due June 2013, effective interest rate of 5.65% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	200,000	200,000
6.500% Senior Notes due January 2014, effective interest rate of 6.63% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	500,000	500,000
5.750% Senior Notes due January 2015, effective interest rate of 5.89% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	500,000	500,000
5.500% Senior Notes due November 2015, effective interest rate of 4.86% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	300,000	300,000
6.950% Senior Notes due June 2016, effective interest rate of 7.09% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	200,000	200,000
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	250,000	250,000
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	500,000	500,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]
The Company's long-term debt consisted of the following:
Long-term debt	500,000
Commercial paper, weighted average interest rate of 0.44% and 0.35% at May 5, 2012 and August 27, 2011, respectively [Member]
The Company's long-term debt consisted of the following:
Long-term debt	$ 349,000	$ 567,600

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Pension and Savings Plans (Tables)

3 Months Ended

May 05, 2012

Pension and Savings Plans [Abstract]

Net periodic pension expense

	Twelve Weeks Ended						Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011			May 5, 2012			May 7, 2011
Interest cost	$	2,819		$	2,570		$	8,456		$	7,709
Expected return on plan assets		(2,704	)		(2,152	)		(8,112	)		(6,456	)
Amortization of net loss		2,260			2,170			6,781			6,511
Net periodic pension expense	$	2,375		$	2,588		$	7,125		$	7,764

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Financing (Details Textual) (USD $)	3 Months Ended	9 Months Ended				1 Months Ended																			9 Months Ended
	Nov. 20, 2010	May 05, 2012	May 07, 2011	Aug. 27, 2011	Sep. 13, 2011 Letters of Credit [Member]	Sep. 13, 2011 Revolving credit facility [Member]	Jul. 31, 2009 Revolving credit facility [Member]	Aug. 27, 2011 Revolving credit facility [Member]	May 05, 2012 5.875% Senior Notes due October 2012, effective interest rate of 6.33% [Member]	Aug. 27, 2011 5.875% Senior Notes due October 2012, effective interest rate of 6.33% [Member]	May 05, 2012 4.375% Senior Notes due June 2013, effective interest rate of 5.65% [Member]	Aug. 27, 2011 4.375% Senior Notes due June 2013, effective interest rate of 5.65% [Member]	May 05, 2012 6.500% Senior Notes due January 2014, effective interest rate of 6.63% [Member]	Aug. 27, 2011 6.500% Senior Notes due January 2014, effective interest rate of 6.63% [Member]	May 05, 2012 5.750% Senior Notes due January 2015, effective interest rate of 5.89% [Member]	Aug. 27, 2011 5.750% Senior Notes due January 2015, effective interest rate of 5.89% [Member]	May 05, 2012 5.500% Senior Notes due November 2015, effective interest rate of 4.86% [Member]	Aug. 27, 2011 5.500% Senior Notes due November 2015, effective interest rate of 4.86% [Member]	May 05, 2012 6.950% Senior Notes due June 2016, effective interest rate of 7.09% [Member]	Aug. 27, 2011 6.950% Senior Notes due June 2016, effective interest rate of 7.09% [Member]	May 05, 2012 7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]	Aug. 27, 2011 7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]	May 05, 2012 4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]	Aug. 27, 2011 4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]	May 05, 2012 3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]	Aug. 27, 2011 3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]	Sep. 13, 2011 Capital Lease Obligations [Member]	May 05, 2012 Commercial paper, weighted average interest rate of 0.44% and 0.35% at May 5, 2012 and August 27, 2011, respectively [Member]	Aug. 27, 2011 Commercial paper, weighted average interest rate of 0.44% and 0.35% at May 5, 2012 and August 27, 2011, respectively [Member]
Debt Instrument [Line Items]
Proceeds from issuance of debt	$ 500,000,000	$ 500,000,000	$ 500,000,000																						$ 500,000,000
Commercial paper borrowings, maturity period (in months)																												12 months
Stated interest rate percentage									5.875%	5.875%	4.375%	4.375%	6.50%	6.50%	5.75%	5.75%	5.50%	5.50%	6.95%	6.95%	7.125%	7.125%	4.00%	4.00%	3.70%	3.70%
Effective interest rate									6.33%	6.33%	5.65%	5.65%	6.63%	6.63%	5.89%	5.89%	4.86%	4.86%	7.09%	7.09%	7.28%	7.28%	4.43%	4.43%	3.85%	3.85%
Weighted average interest rate of commercial paper																												0.44%	0.35%
Line of Credit Facility [Line Items]
Amount available under credit facility					200,000,000	1,000,000,000		800,000,000																			175,000,000
Expiration of credit facility						September 2016	July 2012
Letter of credit facility maximum borrowing capacity						1,250,000,000
Financing (Textual) [Abstract]
Remaining borrowing capacity under revolving credit facility		996,600,000
Interest rate on short-term borrowings		4.63%
Short-term borrowings		7,309,000		34,082,000
Interest accrual on foreign currency loans the basis points		Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt rating.
Fair value of the Company's debt		3,896,000,000		3,633,000,000
Excess (shortfall) of fair value of debt over (from) carrying value		$ 289,700,000		$ 281,000,000

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Comprehensive Income (Tables)

3 Months Ended

May 05, 2012

Comprehensive Income [Abstract]

Comprehensive Income

	Twelve Weeks Ended					Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011		May 5, 2012			May 7, 2011
Net income	$	248,586		$	227,373	$	606,641		$	547,505
Foreign currency translation adjustments		(10,355	)		8,508		(13,616	)		24,790
Net impact from derivative instruments		(1,513	)		405		1,619			(4,594	)
Pension liability adjustments		1,372			736		15,169			3,979
Unrealized gains (losses) from marketable securities		(27	)		220		(138	)		(181	)
Comprehensive income	$	238,063		$	237,242	$	609,675		$	571,499

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Share-Based Payments

3 Months Ended

May 05, 2012

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, restricted stock grants, restricted stock unit grants and the discount on shares sold to employees under share purchase plans. Additionally, directors’ fees are paid in restricted stock units with value equivalent to the value of shares of common stock as of the grant date. The change in fair value of liability-based stock awards is also recognized in share-based compensation expense.

Total share-based compensation expense (a component of Operating, selling, general and administrative expenses) was $8.8 million for the twelve week period ended May 5, 2012, and was $6.4 million for the comparable prior year period. Share-based compensation expense was $23.9 million for the thirty-six week period ended May 5, 2012, and was $18.5 million for the comparable prior year period.

During the thirty-six week period ended May 5, 2012, 467,644 shares of stock options were exercised at a weighted average exercise price of $110.13. In the comparable prior year period, 436,394 shares of stock options were exercised at a weighted average exercise price of $99.87.

The Company made stock option grants of 377,130 shares during the thirty-six week period ended May 5, 2012, and granted options to purchase 424,780 shares during the comparable prior year period. The weighted average fair value of the stock option awards granted during the thirty-six week periods ended May 5, 2012, and May 7, 2011, using the Black-Scholes-Merton multiple-option pricing valuation model, was $93.42 and $58.58 per share, respectively, using the following weighted average key assumptions:

	Thirty-Six Weeks Ended
	May 5, 2012			May 7, 2011
Expected price volatility		31	%		31	%
Risk-free interest rate		0.7	%		1.0	%
Weighted average expected lives (in years)		5.3			4.3
Forfeiture rate		10	%		10	%
Dividend yield		0	%		0	%

See AutoZone’s Annual Report on Form 10-K for the year ended August 27, 2011, for a discussion regarding the methodology used in developing AutoZone’s assumptions to determine the fair value of the option awards and a description of AutoZone’s 2011 Equity Incentive Award Plan and the 2011 Director Compensation Program.

For the twelve week periods ended May 5, 2012 and May 7, 2011, there were no anti-dilutive shares excluded from the diluted earnings per share computation. There were 1,500 anti-dilutive shares excluded from the diluted earnings per share computation for the thirty-six week period ended May 5, 2012, and 1,260 anti-dilutive shares excluded for the comparable prior year.

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Condensed Consolidated Balance Sheets (Parenthetical) (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	May 05, 2012	Aug. 27, 2011
Condensed Consolidated Balance Sheets [Abstract]
Preferred stock, shares authorized	1,000	1,000
Preferred stock, shares issued
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	200,000	200,000
Common stock, shares issued	39,624	44,084
Common stock, shares outstanding	38,069	40,109

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Segment Reporting

3 Months Ended

May 05, 2012

Segment Reporting [Abstract]

Segment Reporting

Note L – 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 Annual Report on Form 10-K for the year ended August 27, 2011.

The Auto Parts Stores segment is a retailer and distributor of automotive parts and accessories through the Company’s 4,910 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 were as follows:

	Twelve Weeks Ended						Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011			May 5, 2012			May 7, 2011
Net Sales
Auto Parts Stores	$	2,068,643		$	1,939,094		$	5,715,683		$	5,318,031
Other		43,223			39,275			124,594			112,946
Total	$	2,111,866		$	1,978,369		$	5,840,277		$	5,430,977
Segment Profit
Auto Parts Stores	$	1,056,587		$	983,256		$	2,903,437		$	2,678,814
Other		33,212			30,274			96,204			88,075
Gross profit		1,089,799			1,013,530			2,999,641			2,766,889
Operating, selling, general and administrative expenses		(662,549	)		(620,605	)		(1,930,806	)		(1,796,095	)
Interest expense, net		(39,743	)		(39,916	)		(117,760	)		(116,745	)
Income before income taxes	$	387,507		$	353,009		$	951,075		$	854,049

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Document and Entity Information	9 Months Ended
	May 05, 2012	Jun. 08, 2012
Document and Entity Information [Abstract]
Entity Registrant Name	AUTOZONE INC
Entity Central Index Key	0000866787
Document Type	10-Q
Document Period End Date	May 05, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q3
Current Fiscal Year End Date	--08-25
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		37,433,856

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General (Policies)

3 Months Ended

May 05, 2012

General [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements: In December 2011, the Financial Accounting Standards Board (“FASB”) issued Accounting Standards Update (“ASU”) 2011-12, Deferral of the Effective Date for Amendments to the Presentation of Reclassifications of Items Out of Accumulated Other Comprehensive Income, which amends Accounting Standards Codification (“ASC”) Topic 220, Comprehensive Income. The purpose of ASU 2011-12 is to defer the effective date pertaining to reclassification adjustments out of accumulated other comprehensive income in ASU 2011-05, Presentation of Comprehensive Income, until the FASB is able to reconsider operational concerns related to ASU 2011-05. All other requirements in ASU 2011-05 are not affected by ASU 2011-12, including the requirement to report comprehensive income either in a single continuous financial statement or in two separate but consecutive financial statements. The Company does not expect the provisions of ASU 2011-05 or ASU 2011-12 to have a material impact on the consolidated financial statements. Both ASU 2011-05 and ASU 2011-12 will be effective for the Company’s fiscal year ending August 31, 2013, including interim periods within that year.

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Condensed Consolidated Statements of Income (Unaudited) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	May 05, 2012	May 07, 2011	May 05, 2012	May 07, 2011
Condensed Consolidated Statements of Income [Abstract]
Net sales	$ 2,111,866	$ 1,978,369	$ 5,840,277	$ 5,430,977
Cost of sales, including warehouse and delivery expenses	1,022,067	964,839	2,840,636	2,664,088
Gross profit	1,089,799	1,013,530	2,999,641	2,766,889
Operating, selling, general and administrative expenses	662,549	620,605	1,930,806	1,796,095
Operating profit	427,250	392,925	1,068,835	970,794
Interest expense, net	39,743	39,916	117,760	116,745
Income before income taxes	387,507	353,009	951,075	854,049
Income taxes	138,921	125,636	344,434	306,544
Net income	$ 248,586	$ 227,373	$ 606,641	$ 547,505
Weighted average shares for basic earnings per share	38,644	41,978	39,263	43,349
Effect of dilutive stock equivalents	946	977	968	973
Adjusted weighted average shares for diluted earnings per share	39,590	42,955	40,231	44,322
Basic earnings per share	$ 6.43	$ 5.42	$ 15.45	$ 12.63
Diluted earnings per share	$ 6.28	$ 5.29	$ 15.08	$ 12.35

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Pension and Savings Plans

3 Months Ended

May 05, 2012

Pension and Savings Plans [Abstract]

Pension and Savings Plans

Note G – Pension and Savings Plans

The components of net periodic pension expense related to the Company’s pension plans consisted of the following:

	Twelve Weeks Ended						Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011			May 5, 2012			May 7, 2011
Interest cost	$	2,819		$	2,570		$	8,456		$	7,709
Expected return on plan assets		(2,704	)		(2,152	)		(8,112	)		(6,456	)
Amortization of net loss		2,260			2,170			6,781			6,511
Net periodic pension expense	$	2,375		$	2,588		$	7,125		$	7,764

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 thirty-six week period ended May 5, 2012, the Company made contributions to its funded plan in the amount of $4.6 million. The Company expects to contribute approximately $10.7 million to the plan during the remainder of fiscal 2012; however, a change to the expected cash funding may be impacted by a change in interest rates or a change in the actual or expected return on plan assets.

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Merchandise Inventories

3 Months Ended

May 05, 2012

Merchandise Inventories [Abstract]

Merchandise Inventories

Note F – 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 $266.2 million at May 5, 2012, and $253.3 million at August 27, 2011.

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Financing (Tables)

3 Months Ended

May 05, 2012

Financing [Abstract]

Components of Company's long-term debt

(in thousands)	May 5, 2012		August 27, 2011
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
6.500% Senior Notes due January 2014, effective interest rate of 6.63%		500,000		500,000
5.750% Senior Notes due January 2015, effective interest rate of 5.89%		500,000		500,000
5.500% Senior Notes due November 2015, effective interest rate of 4.86%		300,000		300,000
6.950% 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
4.000% Senior Notes due November 2020, effective interest rate of 4.43%		500,000		500,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85%		500,000		—
Commercial paper, weighted average interest rate of 0.44% and 0.35% at May 5, 2012 and August 27, 2011, respectively		349,000		567,600
	$	3,599,000	$	3,317,600

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Share-Based Payments (Tables)

3 Months Ended

May 05, 2012

Share-Based Payments [Abstract]

Weighted average fair value of the stock option awards granted, weighted average key assumptions

	Thirty-Six Weeks Ended
	May 5, 2012			May 7, 2011
Expected price volatility		31	%		31	%
Risk-free interest rate		0.7	%		1.0	%
Weighted average expected lives (in years)		5.3			4.3
Forfeiture rate		10	%		10	%
Dividend yield		0	%		0	%

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Comprehensive Income

3 Months Ended

May 05, 2012

Comprehensive Income [Abstract]

Comprehensive Income

Note J – 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.

Comprehensive income consisted of the following:

	Twelve Weeks Ended					Thirty-Six Weeks Ended
(in thousands)	May 5, 2012			May 7, 2011		May 5, 2012			May 7, 2011
Net income	$	248,586		$	227,373	$	606,641		$	547,505
Foreign currency translation adjustments		(10,355	)		8,508		(13,616	)		24,790
Net impact from derivative instruments		(1,513	)		405		1,619			(4,594	)
Pension liability adjustments		1,372			736		15,169			3,979
Unrealized gains (losses) from marketable securities		(27	)		220		(138	)		(181	)
Comprehensive income	$	238,063		$	237,242	$	609,675		$	571,499

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Financing

3 Months Ended

May 05, 2012

Financing [Abstract]

Financing

Note H – Financing

The Company’s long-term debt consisted of the following:

(in thousands)	May 5, 2012		August 27, 2011
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
6.500% Senior Notes due January 2014, effective interest rate of 6.63%		500,000		500,000
5.750% Senior Notes due January 2015, effective interest rate of 5.89%		500,000		500,000
5.500% Senior Notes due November 2015, effective interest rate of 4.86%		300,000		300,000
6.950% 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
4.000% Senior Notes due November 2020, effective interest rate of 4.43%		500,000		500,000
3.700% Senior Notes due April 2022, effective interest rate of 3.85%		500,000		—
Commercial paper, weighted average interest rate of 0.44% and 0.35% at May 5, 2012 and August 27, 2011, respectively		349,000		567,600
	$	3,599,000	$	3,317,600

As of May 5, 2012, the commercial paper borrowings and the 5.875% Senior Notes due October 2012 mature in the next twelve months, but are classified as long-term in the accompanying Condensed Consolidated Balance Sheets, as the Company has the ability and intent to refinance them on a long-term basis. Specifically, excluding the effect of commercial paper borrowings, the Company had $996.6 million of availability under its $1.0 billion revolving credit facility, expiring in September 2016, which would allow it to replace these short-term obligations with long-term financing.

In addition to the long-term debt discussed above, as of May 5, 2012, the Company had $7.3 million of short-term borrowings that are scheduled to mature in the next 12 months. The short-term borrowings are unsecured, peso-denominated borrowings and accrued interest at 4.63% as of May 5, 2012.

On April 24, 2012, the Company issued $500 million in 3.700% Senior Notes due April 2022 under the Company’s shelf registration statement filed with the Securities and Exchange Commission on April 17, 2012 (the “Shelf Registration”). The Shelf Registration allows the Company to sell an indeterminate amount in debt securities to fund general corporate purposes, including repaying, redeeming or repurchasing outstanding debt and for working capital, capital expenditures, new store openings, stock repurchases and acquisitions. The Company used the proceeds from the issuance of debt to repay a portion of the commercial paper borrowings and for general corporate purposes.

In September 2011, the Company amended and restated its $800 million revolving credit facility, which was scheduled to expire in July 2012. The capacity under the revolving credit facility was increased to $1.0 billion. This credit facility is available to primarily support commercial paper borrowings, letters of credit and other short-term unsecured bank loans. The capacity of the credit facility may be increased to $1.250 billion prior to the maturity date at the Company’s election and subject to bank credit capacity and approval, may include up to $200 million in letters of credit, and may include up to $175 million in capital leases each fiscal year. Under the revolving credit facility, the Company may borrow funds consisting of Eurodollar loans or base rate loans. Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable percentage, as defined in the revolving credit facility, depending upon the Company’s senior, unsecured, (non-credit enhanced) long-term debt rating. Interest accrues on base rate loans as defined in the credit facility. The Company also has the option to borrow funds under the terms of a swingline loan subfacility. The revolving credit facility expires in September 2016.

The fair value of the Company’s debt was estimated at $3.896 billion as of May 5, 2012, and $3.633 billion as of August 27, 2011, 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 terms (Level 2). Such fair value is greater than the carrying value of debt by $289.7 million at May 5, 2012, and $281.0 million at August 27, 2011.

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Stock Repurchase Program

3 Months Ended

May 05, 2012

Stock Repurchase Program [Abstract]

Stock Repurchase Program

Note I – Stock Repurchase Program

From January 1, 1998 to May 5, 2012, the Company has repurchased a total of 129.9 million shares at an aggregate cost of $11.1 billion, including 2,510,029 shares of its common stock at an aggregate cost of $882.7 million during the thirty-six week period ended May 5, 2012. On March 7, 2012, the Board voted to increase the authorization by $750 million to raise the cumulative share repurchase authorization from $11.15 billion to $11.9 billion. Considering the cumulative repurchases as of May 5, 2012, the Company had $835.9 million remaining under the Board’s authorization to repurchase its common stock. Subsequent to May 5, 2012, the Company has repurchased 893,910 shares of its common stock at an aggregate cost of $335.5 million.

During the thirty-six week period ended May 5, 2012, the Company retired 4.9 million shares of treasury stock which had previously been repurchased under the Company’s share repurchase program. The retirement increased Retained deficit by $1,319.6 million and decreased Additional paid-in capital by $72.5 million. During the comparable prior year period, the Company retired 6.6 million shares of treasury stock, which increased Retained deficit by $1,247.7 million and decreased Additional paid-in capital by $82.2 million.

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Litigation

3 Months Ended

May 05, 2012

Litigation [Abstract]

Litigation

Note K – Litigation

The Company was a defendant in a lawsuit entitled “Coalition for a Level Playing Field, L.L.C., et al., v. AutoZone, Inc. et al.,” filed in the U.S. District Court for the Southern District of New York in October 2004. The case was filed by more than 200 plaintiffs, which are principally automotive aftermarket warehouse distributors and jobbers, against a number of defendants, including automotive aftermarket retailers and aftermarket automotive parts manufacturers. The plaintiffs alleged, inter alia, that some or all of the automotive aftermarket retailer defendants including AutoZone had knowingly received, in violation of the Robinson-Patman Act, from various of the manufacturer defendants benefits such as volume discounts, rebates, early buy allowances and other allowances, fees, and other payments including sham advertising and promotional payments that were not available to Plaintiffs.

In an order issued on September 16, 2010, the court granted motions to dismiss all claims against AutoZone and its co-defendant competitors and suppliers. The court ordered the case closed, but allowed plaintiffs to move for leave to file a third amended complaint. In an order dated September 28, 2011, the court denied the plaintiffs’ motion for leave to file a third amended complaint because the proposed third amended complaint failed to address deficiencies previously identified by the court. On October 26, 2011, plaintiffs filed an appeal of the dismissal in the U.S. Court of Appeals for the Second Circuit. Following mediation, on March 23, 2012, all parties settled the case pursuant to a confidential settlement agreement. On April 5, 2012, the case was withdrawn with prejudice from the U.S. Court of Appeals for the Second Circuit. On April 11, 2012, the case was dismissed with prejudice by the U.S. District Court for the Southern District of New York.

In 2004, the Company acquired a store site in Mount Ephraim, New Jersey that had previously been the site of a gasoline service station and contained evidence of groundwater contamination. Upon acquisition, the Company voluntarily reported the groundwater contamination issue to the New Jersey Department of Environmental Protection and entered into a Voluntary Remediation Agreement providing for the remediation of the contamination associated with the property. The Company has conducted and paid for (at an immaterial cost to the Company) remediation of visible contamination on the property and is investigating, and will be addressing, potential vapor intrusion impacts in downgradient residences and businesses. The New Jersey Department of Environmental Protection has indicated that it will assert that the Company is liable for the downgradient impacts under a joint and severable liability theory, and the Company intends to contest any such assertion. Pursuant to the Voluntary Remediation Agreement, upon completion of all remediation required by the agreement, the Company believes it should be eligible to be reimbursed up to 75 percent of qualified remediation costs by the State of New Jersey. The Company has asked the state for clarification that the agreement applies to off-site work, and the state is considering the request. Although the aggregate amount of additional costs that the Company may incur pursuant to the remediation cannot currently be ascertained, the Company does not currently believe that fulfillment of its obligations under the agreement or otherwise will result in costs that are material to its financial condition, results of operations or cash flow.

The Company is involved in various other legal proceedings incidental to the conduct of its business, including several lawsuits containing class-action allegations in which the plaintiffs are current and former hourly and salaried employees who allege various wage and hour violations and unlawful termination practices. The Company does not currently believe that, either individually or in the aggregate, these matters will result in liabilities material to the Company’s financial condition, results of operations or cash flows.

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Pension and Savings Plans (Details) (USD $)	3 Months Ended		9 Months Ended
	May 05, 2012	May 07, 2011	May 05, 2012	May 07, 2011
Net periodic pension expense
Interest cost	$ 2,819,000	$ 2,570,000	$ 8,456,000	$ 7,709,000
Expected return on plan assets	(2,704,000)	(2,152,000)	(8,112,000)	(6,456,000)
Amortization of net loss	2,260,000	2,170,000	6,781,000	6,511,000
Net periodic pension expense	2,375,000	2,588,000	7,125,000	7,764,000
Pension and Savings Plans (Textual) [Abstract]
Annual contributions by the Company to pension plans			4,600,000
Expected contributions to the plan during the remainder of fiscal 2012	$ 10,700,000		$ 10,700,000

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Marketable Securities (Tables)

3 Months Ended

May 05, 2012

Marketable Securities [Abstract]

Available-for-sale marketable securities

	May 5, 2012
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	24,930	$	234	$	(5	)	$	25,159
Government bonds		27,792		184		(3	)		27,973
Mortgage-backed securities		4,868		26		(4	)		4,890
Asset-backed securities and other		18,628		94		—			18,722
	$	76,218	$	538	$	(12	)	$	76,744
	August 27, 2011
(in thousands)	Amortized Cost Basis		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Corporate securities	$	26,261	$	229	$	(45	)	$	26,445
Government bonds		29,464		343		—			29,807
Mortgage-backed securities		4,291		55		—			4,346
Asset-backed securities and other		12,377		156		—			12,533
	$	72,393	$	783	$	(45	)	$	73,131

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General (Details)	9 Months Ended
	May 05, 2012
General (Textual) [Abstract]
Description of reporting periods	Operating results for the twelve and thirty-six weeks ended May 5, 2012, are not necessarily indicative of the results that may be expected for the fiscal year ending August 25, 2012. 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 quarters for fiscal 2011 and fiscal 2012 each have 16 weeks. Additionally, the Company’s business is somewhat seasonal in nature, with the highest sales generally occurring during the months of February through September and the lowest sales generally occurring in the months of December and January.

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Condensed Consolidated Statements of Cash Flows (Unaudited) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	May 05, 2012	May 07, 2011
Cash flows from operating activities:
Net income	$ 606,641	$ 547,505
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization of property and equipment	145,177	133,347
Amortization of debt origination fees	5,426	6,060
Income tax benefit from exercise of stock options	(37,263)	(22,027)
Deferred income taxes	3,413	(9,771)
Share-based compensation expense	23,872	18,482
Changes in operating assets and liabilities:
Accounts receivable	6,556	(9,872)
Merchandise inventories	(169,578)	(174,138)
Accounts payable and accrued expenses	102,849	277,158
Income taxes payable	92,438	111,823
Other, net	19,076	18,326
Net cash provided by operating activities	798,607	896,893
Cash flows from investing activities:
Capital expenditures	(228,277)	(200,584)
Purchase of marketable securities	(34,132)	(34,720)
Proceeds from sale of marketable securities	30,306	32,087
Disposal of capital assets and other, net	5,870	2,299
Net cash used in investing activities	(226,233)	(200,918)
Cash flows from financing activities:
Net payments of commercial paper	(218,600)	(11,900)
Net (payments) proceeds from short-term borrowings	(24,793)	19,690
Proceeds from issuance of debt	500,000	500,000
Repayment of debt	0	(199,300)
Net proceeds from sale of common stock	50,521	42,147
Purchase of treasury stock	(882,725)	(1,033,488)
Income tax benefit from exercise of stock options	37,263	22,027
Payments of capital lease obligations	(17,352)	(16,683)
Other, net	(10,927)	(17,180)
Net cash used in financing activities	(566,613)	(694,687)
Effect of exchange rate changes on cash	(267)	799
Net increase in cash and cash equivalents	5,494	2,087
Cash and cash equivalents at beginning of period	97,606	98,280
Cash and cash equivalents at end of period	$ 103,100	$ 100,367

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Derivative Financial Instruments

3 Months Ended

May 05, 2012

Derivative Financial Instruments [Abstract]

Derivative Financial Instruments

Note E – Derivative Financial Instruments

During the third quarter of fiscal 2012, the Company entered into two treasury rate locks. These agreements were designated as cash flow hedges and were used to hedge the exposure to variability in future cash flows resulting from changes in variable interest rates related to the $500 million Senior Note debt issuance in April 2012. The treasury rate locks had notional amounts of $300 million and $100 million with associated fixed rates of 2.09% and 2.07% respectively. The locks were benchmarked based on the 10-year U.S. treasury notes. These locks expired on April 20, 2012 and resulted in a loss of $2.8 million, which has been deferred in Accumulated other comprehensive loss and will be reclassified to Interest expense over the life of the underlying debt. The hedges remained highly effective until they expired, and no ineffectiveness was recognized in earnings.

During the first quarter of fiscal 2011, the Company was party to three forward starting swaps, of which two were entered into during the fourth quarter of fiscal 2010 and one was entered into during the first quarter of fiscal 2011. These agreements were designated as cash flow hedges and were used to hedge the exposure to variability in future cash flows resulting from changes in variable interest rates related to the $500 million Senior Note debt issuance during the first quarter of fiscal 2011. The swaps had notional amounts of $150 million, $150 million and $100 million with associated fixed rates of 3.15%, 3.13%, and 2.57%, respectively. The swaps were benchmarked based on the 3-month London InterBank Offered Rate (“LIBOR”). These swaps expired in November 2010 and resulted in a loss of $11.7 million, which has been deferred in Accumulated other comprehensive loss and will be reclassified to Interest expense over the life of the underlying debt. The hedges remained highly effective until they expired, and no ineffectiveness was recognized in earnings.

At May 5, 2012, the Company had $5.4 million recorded in Accumulated other comprehensive loss related to net realized losses associated with terminated interest rate swap and treasury rate lock derivatives which were designated as hedging instruments. Net losses are amortized into Interest expense over the remaining life of the associated debt. During the thirty-six week period ended May 5, 2012, the Company reclassified $1.2 million of net losses from Accumulated other comprehensive loss to Interest expense. In the comparable prior year period, the Company reclassified $858 thousand of net losses from Accumulated other comprehensive loss to Interest expense. The Company expects to reclassify $1.7 million of net losses from Accumulated other comprehensive loss to Interest expense over the next 12 months.

Subsequent to May 5, 2012, the Company entered into two treasury rate locks, each with a notional amount of $100 million. These agreements, which are set to expire on November 1, 2012, are cash flow hedges used to hedge the exposure to variability in future cash flows resulting from changes in variable interest rates relating to an anticipated debt transaction. The fixed rates of the hedges are 2.07% and 1.92% and are benchmarked based on the 10-year U.S. treasury notes. It is expected that upon settlement of these agreements, the realized gain or loss will be deferred in Accumulated other comprehensive loss and reclassified to Interest expense over the life of the underlying debt.

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Share-Based Payments (Details)	9 Months Ended
	May 05, 2012 Y	May 07, 2011 Y
Weighted average fair value of the stock option awards granted, weighted average key assumptions
Expected price volatility	31.00%	31.00%
Risk-free interest rate	0.70%	1.00%
Weighted average expected lives (in years)	5.3	4.3
Forfeiture rate	10.00%	10.00%
Dividend yield	0.00%	0.00%

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Comprehensive Income (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	May 05, 2012	May 07, 2011	May 05, 2012	May 07, 2011
Comprehensive Income
Net income	$ 248,586	$ 227,373	$ 606,641	$ 547,505
Foreign currency translation adjustments	(10,355)	8,508	(13,616)	24,790
Net impact from derivative instruments	(1,513)	405	1,619	(4,594)
Pension liability adjustments	1,372	736	15,169	3,979
Unrealized gains (losses) from marketable securities	(27)	220	(138)	(181)
Comprehensive income	$ 238,063	$ 237,242	$ 609,675	$ 571,499

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Fair Value Measurements (Tables)

3 Months Ended

May 05, 2012

Fair Value Measurements [Abstract]

Company's assets and liabilities measured at fair value on a recurring basis

	May 5, 2012
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	5,542	$	—	$	—	$	5,542
Other long-term assets		60,394		10,808		—		71,202
	$	65,936	$	10,808	$	—	$	76,744
	August 27, 2011
(in thousands)	Level 1		Level 2		Level 3		Fair Value
Other current assets	$	11,872	$	—	$	—	$	11,872
Other long-term assets		55,390		5,869		—		61,259
	$	67,262	$	5,869	$	—	$	73,131