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Accrued Expenses and Other - Additional Information (Detail) | 12 Months Ended
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Aug. 26, 2017 USD ($)
Workers' Compensation [Member] |
Loss Contingencies [Line Items] |
Maximum limits per claim for self-insured plan, per annum | $ 1,500,000
Employee Health [Member] |
Loss Contingencies [Line Items] |
Maximum limits per claim for self-insured plan, per annum | 700,000
General and Products Liability [Member] |
Loss Contingencies [Line Items] |
Maximum limits per claim for self-insured plan, per annum | 1,000,000
Vehicles [Member] |
Loss Contingencies [Line Items] |
Maximum limits per claim for self-insured plan, per annum | 2,000,000
Property [Member] |
Loss Contingencies [Line Items] |
Maximum limits per claim for self-insured plan, per annum | $ 21,500,000

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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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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
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
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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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_VehiclesInsuranceMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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