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/presentationRef

-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

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 835

-SubTopic 30

-Section 45

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399

+ 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

+ 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.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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Name:	us-gaap_DebtInstrumentAxis=azo_SeniorNotesTwelveMember
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- Details

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Financing - Schedule of Debt (Parenthetical) (Detail)					12 Months Ended
Financing - Schedule of Debt (Parenthetical) (Detail)	Apr. 29, 2015	Jan. 14, 2014	Apr. 29, 2013	Nov. 13, 2012	Aug. 29, 2015	Aug. 30, 2014
Commercial paper, weighted average interest rate of 0.45% and 0.27% at August 29, 2015 and August 30, 2014, respectively [Member]
Debt Instrument [Line Items]
Weighted average interest rate of commercial paper					0.45%	0.27%
5.750% Senior Notes due January 2015, effective interest rate of 5.89% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage					5.75%	5.75%
Effective interest rate					5.89%	5.89%
Debt instrument maturity, month and year					2015-01	2015-01
5.500% Senior Notes due November 2015, effective interest rate of 4.86% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage					5.50%	5.50%
Effective interest rate					4.86%	4.86%
Debt instrument maturity, month and year					2015-11	2015-11
6.950% Senior Notes due June 2016, effective interest rate of 7.09% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage					6.95%	6.95%
Effective interest rate					7.09%	7.09%
Debt instrument maturity, month and year					2016-06	2016-06
1.300% Senior Notes due January 2017, effective interest rate 1.43% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage		1.30%			1.30%	1.30%
Effective interest rate					1.43%	1.43%
Debt instrument maturity, month and year		2017-01			2017-01	2017-01
7.125% Senior Notes due August 2018, effective interest rate of 7.28% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage					7.125%	7.125%
Effective interest rate					7.28%	7.28%
Debt instrument maturity, month and year					2018-08	2018-08
4.000% Senior Notes due November 2020, effective interest rate of 4.43% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage					4.00%	4.00%
Effective interest rate					4.43%	4.43%
Debt instrument maturity, month and year					2020-11	2020-11
2.500% Senior Notes due April 2021, effective interest rate of 3.85% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	2.50%				2.50%
Effective interest rate					3.85%
Debt instrument maturity, month and year	2021-04				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%	3.70%
Effective interest rate					3.85%	3.85%
Debt instrument maturity, month and year					2022-04	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%	2.875%	2.875%
Effective interest rate					3.21%	3.21%
Debt instrument maturity, month and year				2023-01	2023-01	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%		3.125%	3.125%
Effective interest rate					3.26%	3.26%
Debt instrument maturity, month and year			2023-07		2023-07	2023-07
3.250% Senior Notes due April 2025, effective interest rate 3.36% [Member]
Debt Instrument [Line Items]
Stated interest rate percentage	3.25%				3.25%
Effective interest rate					3.36%
Debt instrument maturity, month and year	2025-04				2025-04