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v3.19.3

Accrued Expenses and Other - Additional Information (Detail) | 12 Months Ended
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Aug. 31, 2019 USD ($)
Workers' Compensation [Member] |
Maximum limits per claim for self-insured plan, per annum | $ 2,000,000
Auto Liability [Member] |
Maximum limits per claim for self-insured plan, per annum | 3,000,000
Property [Member] |
Maximum limits per claim for self-insured plan, per annum | 21,500,000
Employee Health [Member] |
Maximum limits per claim for self-insured plan, per annum | 700,000
General Products Liability And Vehicle [Member] |
Maximum limits per claim for self-insured plan, per annum | $ 1,000,000

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- Definition The maximum amount limit per claim for self-insured plan per annum. + References No definition available. + Details
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Namespace Prefix: | azo_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=azo_AutoLiabilityMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=azo_PropertyMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_LossContingenciesByNatureOfContingencyAxis=azo_EmployeeHealthMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |