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v3.20.4

Employee Benefit Plan (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Jan. 30, 2021 | Feb. 01, 2020 | Feb. 02, 2019
Retirement Benefits [Abstract] |  |  |
Discretionary matching and profit sharing contributions, vesting period | 5 years |  |
Employer discretionary contribution amount | $ 2.8 | $ 2.9 | $ 1.2

X
- Definition Number Of Years For Matched Contributions To Vest + References No definition available. + Details
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Namespace Prefix: | five_
Data Type: | xbrli:durationItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | na
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- Definition Amount of discretionary contributions made by an employer to a defined contribution plan. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration