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Share-Based Compensation - Schedule of stock option activity under plan (Details)	6 Months Ended
	Aug. 02, 2025
Share-Based Payment Arrangement [Abstract]
Stock option maximum term (in years)	10 years
Stock option vesting period (in years)	4 years

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- Definition

Stock Option Maximum Term

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No definition available.

+ Details

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- Definition

Stock Option Vesting Period

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No definition available.

+ Details

Name:	five_StockOptionVestingPeriod
Namespace Prefix:	five_
Data Type:	xbrli:durationItemType
Balance Type:	na
Period Type:	duration

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No definition available.

+ Details

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