XML 34 R44.htm IDEA: XBRL DOCUMENT v2.4.1.9
Financing - Additional Information (Detail) (USD $)
9 Months Ended 3 Months Ended 12 Months Ended 0 Months Ended
May 09, 2015
May 10, 2014
May 09, 2015
Aug. 30, 2014
Jan. 14, 2014
Apr. 29, 2015
Dec. 19, 2014
Line of Credit Facility [Line Items]              
Commercial paper $ 934,500,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent   934,500,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent 893,800,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent      
Long-term debt 4,533,329,000us-gaap_LongTermDebtNoncurrent   4,533,329,000us-gaap_LongTermDebtNoncurrent 4,162,890,000us-gaap_LongTermDebtNoncurrent      
Remaining borrowing capacity under revolving credit facility 1,711,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity   1,711,000,000us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity        
Amount available under credit facility 1,750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity   1,750,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity        
Proceeds from issuance of debt 648,829,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt 400,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt          
Fair value of the Company's debt 4,635,000,000us-gaap_DebtInstrumentFairValue   4,635,000,000us-gaap_DebtInstrumentFairValue 4,480,000,000us-gaap_DebtInstrumentFairValue      
Excess (shortfall) of fair value of debt over (from) carrying value 101,200,000us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments   101,200,000us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments 136,600,000us-gaap_FairValueOptionAggregateDifferencesLongTermDebtInstruments      
Commercial paper, weighted average interest rate of 0.45% and 0.27% at May 9, 2015 and August 30, 2014, respectively [Member]              
Line of Credit Facility [Line Items]              
Commercial paper 934,500,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember
  934,500,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_CommercialPaperMember
       
5.750% Senior Notes due January 2015, effective interest rate of 5.89% [Member]              
Line of Credit Facility [Line Items]              
Stated interest rate percentage 5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= azo_SeniorNotesFiveMember
  5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= azo_SeniorNotesFiveMember
5.75%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_LongtermDebtTypeAxis
= azo_SeniorNotesFiveMember
     
Debt instrument maturity, month and year 2015-01   2015-01 2015-01      
Repayment of commercial paper 500,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_LongtermDebtTypeAxis
= azo_SeniorNotesFiveMember
           
Multi Year Revolving Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Amount available under credit facility             1,250,000,000us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
Extended expiration of credit facility 2 years            
Amount available under credit facility             1,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
Borrowings, outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
  0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
       
Letters of credit, outstanding 3,500,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
  3,500,000us-gaap_LettersOfCreditOutstandingAmount
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
       
Multi Year Revolving Credit Agreement [Member] | Capital Leases [Member]              
Line of Credit Facility [Line Items]              
Amount available under credit facility             225,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= azo_MultiYearRevolvingCreditAgreementMember
/ us-gaap_LongtermDebtTypeAxis
= azo_CapitalLeasesMember
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.            
Expiration of credit facility December 2019            
Letters of Credit [Member]              
Line of Credit Facility [Line Items]              
Amount available under credit facility             200,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= us-gaap_LetterOfCreditMember
364-Day Revolving Credit Agreement [Member]              
Line of Credit Facility [Line Items]              
Amount available under credit facility             500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_CreditFacilityAxis
= azo_ThreeSixtyFourDayRevolvingCreditAgreementMember
Credit facility interest rate description Interest accrues on Eurodollar loans at a defined Eurodollar rate, defined as LIBOR plus the applicable margin, as defined in the revolving credit facility, depending upon the Company's senior, unsecured, (non-credit enhanced) long-term debt rating.            
Credit facility expiration date Dec. 19, 2015            
Credit facility expiration extension period subject to bank approval 364 days            
Borrowings, outstanding 0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= azo_ThreeSixtyFourDayRevolvingCreditAgreementMember
  0us-gaap_LineOfCredit
/ us-gaap_CreditFacilityAxis
= azo_ThreeSixtyFourDayRevolvingCreditAgreementMember
       
364-Day Revolving Credit Agreement [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility extension or modification period prior to expiration 45 days            
Term Loan [Member]              
Line of Credit Facility [Line Items]              
Percentage of penalty for extending expiration period 1.00%azo_PercentageOfPenaltyForExtendingExpirationPeriod
/ us-gaap_CreditFacilityAxis
= azo_TermLoanMember
           
Term Loan [Member] | Maximum [Member]              
Line of Credit Facility [Line Items]              
Line of credit facility extension or modification period prior to expiration 15 days            
Term Loan Maturity Period 1 year            
1.300% Senior Notes due January 2017, effective interest rate 1.43% [Member]              
Line of Credit Facility [Line Items]              
Stated interest rate percentage         1.30%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesThirteenMember
   
Debt instrument maturity, month and year         2017-01    
Proceeds from issuance of debt         400,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesThirteenMember
   
6.500% Senior Notes due January 2014 [Member]              
Line of Credit Facility [Line Items]              
Commercial paper         500,000,000us-gaap_LongtermCommercialPaperCurrentAndNoncurrent
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesFourMember
   
Stated interest rate percentage         6.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesFourMember
   
Debt instrument maturity, month and year         2014-01    
5.500% Senior Notes due November 2015, effective interest rate of 4.86% [Member]              
Line of Credit Facility [Line Items]              
Long-term debt 300,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesSixMember
  300,000,000us-gaap_LongTermDebtNoncurrent
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesSixMember
       
Stated interest rate percentage 5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesSixMember
  5.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesSixMember
       
Debt instrument maturity, month and year 2015-11            
3.250% Senior Notes due April 2025, effective interest rate of 3.36% [Member]              
Line of Credit Facility [Line Items]              
Stated interest rate percentage           3.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesFifteenMember
 
Debt instrument maturity, month and year           2025-04  
Proceeds from issuance of debt           400,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesFifteenMember
 
2.500% Senior Notes due April 2021, effective interest rate of 2.62% [Member]              
Line of Credit Facility [Line Items]              
Stated interest rate percentage           2.50%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesFourteenMember
 
Debt instrument maturity, month and year           2021-04  
Proceeds from issuance of debt           $ 250,000,000us-gaap_ProceedsFromIssuanceOfSeniorLongTermDebt
/ us-gaap_DebtInstrumentAxis
= azo_SeniorNotesFourteenMember