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v3.20.1

Segment Reporting - Additional Information (Detail) | 6 Months Ended
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Feb. 15, 2020 Store Segments
Segment Reporting [Abstract] |
Number of reportable segments | Segments | 2
Number of automotive parts and accessories locations in the United States, Puerto Rico, Mexico, and Brazil | Store | 6,461

X
- Definition Number of locations. + References No definition available. + Details
Name: | azo_NumberOfLocations
Namespace Prefix: | azo_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Number of segments reported by the entity. A reportable segment is a component of an entity for which there is an accounting requirement to report separate financial information on that component in the entity's financial statements. + References No definition available. + Details
Name: | us-gaap_NumberOfReportableSegments
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_SegmentReportingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration