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v3.21.2

Summary of Significant Accounting Policies (Nature of Business) (Details) | Jul. 31, 2021 USD ($) state Stores | Aug. 01, 2020 Stores
--- | --- | ---
Accounting Policies [Abstract] |  |
Products offering price, maximum price | $ | $ 5 |
Number of states in which entity operates (state) | state | 39 |
Number of stores (store) | Stores | 1,121 | 982

X
- Definition Products Offering Price + References No definition available. + Details
Name: | five_ProductsOfferingPrice
Namespace Prefix: | five_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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

X
- Definition The number of states the entity operates in as of the balance sheet date. + References No definition available. + Details
Name: | us-gaap_NumberOfStatesInWhichEntityOperates
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant

X
- Definition Represents the number of stores. + References No definition available. + Details
Name: | us-gaap_NumberOfStores
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant