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Stock Repurchase Program - Additional Information (Detail) (USD $)
0 Months Ended 6 Months Ended 12 Months Ended 0 Months Ended 205 Months Ended
Jun. 17, 2014
Feb. 14, 2015
Aug. 30, 2014
Mar. 24, 2015
Feb. 14, 2015
Jun. 16, 2014
Mar. 23, 2015
Stock Repurchase Program [Line Items]              
Stock repurchased cumulative, shares   614,099us-gaap_StockRepurchasedDuringPeriodShares          
Purchase of treasury stock   $ 325,700,000us-gaap_TreasuryStockValueAcquiredCostMethod          
Increase in authorization of stock repurchase, value 750,000,000azo_IncreaseInAmountAuthorizedUnderStockRepurchaseProgram            
Stock repurchase authorized amended value 14,900,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1         14,150,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1  
Remaining value authorized for share repurchases   543,600,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1     543,600,000us-gaap_StockRepurchaseProgramRemainingAuthorizedRepurchaseAmount1    
Treasury stock acquired repurchase authorization   From January 1, 1998 to February 14, 2015 the Company has repurchased a total of 137.5 million shares at an aggregate cost of $14.356 billion, including 614,099 shares of its common stock at an aggregate cost of $325.7 million during the twenty-four week period ended February 14, 2015. On June 17, 2014, the Board voted to increase the authorization by $750 million to raise the cumulative share repurchase authorization from $14.15 billion to $14.9 billion. Considering the cumulative repurchases as of February 14, 2015, the Company had $543.6 million remaining under the Board’s authorization to repurchase its common stock.          
Share of treasury stock retired   2,100,000us-gaap_TreasuryStockSharesRetired 3,200,000us-gaap_TreasuryStockSharesRetired        
Retained Deficit [Member]              
Stock Repurchase Program [Line Items]              
Treasury stock retired, cost method   (1,050,000,000)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
(1,220,000,000)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_RetainedEarningsMember
       
Additional Paid-In Capital [Member]              
Stock Repurchase Program [Line Items]              
Treasury stock retired, cost method   (57,400,000)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
(74,000,000)us-gaap_TreasuryStockRetiredCostMethodAmount
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_AdditionalPaidInCapitalMember
       
Subsequent Event [Member]              
Stock Repurchase Program [Line Items]              
Stock repurchased cumulative, shares       268,371us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Purchase of treasury stock       174,100,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Increase in authorization of stock repurchase, value       750,000,000azo_IncreaseInAmountAuthorizedUnderStockRepurchaseProgram
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
Stock repurchase authorized amended value       15,650,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
    14,900,000,000us-gaap_StockRepurchaseProgramAuthorizedAmount1
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
Remaining value authorized for share repurchases       1,119,000,000azo_RemainingValueAuthorizedForShareRepurchases
/ us-gaap_SubsequentEventTypeAxis
= us-gaap_SubsequentEventMember
     
January 1,1998 to February 14,2015 [Member]              
Stock Repurchase Program [Line Items]              
Stock repurchased cumulative, shares         137,500,000us-gaap_StockRepurchasedDuringPeriodShares
/ us-gaap_StatementScenarioAxis
= azo_JanuaryNineteenNinetyEightToFebruaryFourteenTwoThousandAndFifteenMember
   
Purchase of treasury stock         $ 14,356,000,000us-gaap_TreasuryStockValueAcquiredCostMethod
/ us-gaap_StatementScenarioAxis
= azo_JanuaryNineteenNinetyEightToFebruaryFourteenTwoThousandAndFifteenMember