Maturity date (by month and year) for debt instrument.

No definition available.

Name:	azo_DebtInstrumentMaturityMonthAndYear
Namespace Prefix:	azo_
Data Type:	xbrli:gYearMonthItemType
Balance Type:	na
Period Type:	duration

- Definition

Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 6
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6036836-161870

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateEffectivePercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Contractual interest rate for funds borrowed, under the debt agreement.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateStatedPercentage
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Weighted average interest rate of long-term debt outstanding calculated at point in time.

+ References

No definition available.

+ Details

Name:	us-gaap_LongtermDebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_CommercialPaperMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesSixteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesNineMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesFourteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesTenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesElevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesTwelveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesThirteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesFifteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesSeventeenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesEighteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesNineteenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Financing - Schedule of Debt (Parenthetical) (Detail)	1 Months Ended	8 Months Ended
Financing - Schedule of Debt (Parenthetical) (Detail)	Apr. 18, 2019	May 04, 2019	Aug. 25, 2018
Commercial paper, weighted average interest rate of 2.64% and 2.29% at May 4, 2019 and August 25, 2018, respectively
Debt Instrument [Line Items]
Weighted average interest rate of commercial paper		2.64%	2.29%
1.625% Senior Notes due April 2019, effective interest rate of 1.77% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	1.625%	1.625%
Effective interest rate		1.77%
Debt instrument maturity, month and year	2019-04	2019-04
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		4.00%
Effective interest rate		4.43%
Debt instrument maturity, month and year		2020-11
2.500% Senior Notes due April 2021, effective interest rate of 2.62% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		2.50%
Effective interest rate		2.62%
Debt instrument maturity, month and year		2021-04
3.700% Senior Notes due April 2022, effective interest rate of 3.85% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		3.70%
Effective interest rate		3.85%
Debt instrument maturity, month and year		2022-04
2.875% Senior Notes due January 2023, effective interest rate of 3.21% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		2.875%
Effective interest rate		3.21%
Debt instrument maturity, month and year		2023-01
3.125% Senior Notes due July 2023, effective interest rate of 3.26% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		3.125%
Effective interest rate		3.26%
Debt instrument maturity, month and year		2023-07
3.125% Senior Notes due April 2024, effective interest rate 3.32% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.125%	3.125%
Effective interest rate		3.32%
Debt instrument maturity, month and year	2024-04	2024-04
3.250% Senior Notes due April 2025, effective interest rate 3.36% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		3.25%
Effective interest rate		3.36%
Debt instrument maturity, month and year		2025-04
3.125% Senior Notes due April 2026, effective interest rate of 3.28% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		3.125%
Effective interest rate		3.28%
Debt instrument maturity, month and year		2026-04
3.750% Senior Notes due June 2027, effective interest rate of 3.83% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		3.75%
Effective interest rate		3.83%
Debt instrument maturity, month and year		2027-06
3.750% Senior Notes due April 2029, effective interest rate of 3.86% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.75%	3.75%
Effective interest rate		3.86%
Debt instrument maturity, month and year	2029-04	2029-04