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Segment Reporting (Percentage of Net Sales Represented by Each Product Group) (Details)	12 Months Ended
	Feb. 03, 2024	Jan. 28, 2023	Jan. 29, 2022
Revenue from External Customer [Line Items]
Percentage of sales by product group (percent)	100.00%	100.00%	100.00%
Leisure [Member]
Revenue from External Customer [Line Items]
Percentage of sales by product group (percent)	46.20%	47.60%	49.60%
Fashion And Home [Member]
Revenue from External Customer [Line Items]
Percentage of sales by product group (percent)	29.30%	29.20%	30.20%
Party And Snack [Member]
Revenue from External Customer [Line Items]
Percentage of sales by product group (percent)	24.50%	23.20%	20.20%

X

- Definition

Percentage Of Sales Volume

+ References

No definition available.

+ Details

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Namespace Prefix:	five_
Data Type:	dtr-types1:percentItemType
Balance Type:	na
Period Type:	duration

X

- 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

X

- Details

Name:	srt_ProductOrServiceAxis=five_LeisureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=five_FashionAndHomeMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	srt_ProductOrServiceAxis=five_PartyAndSnackMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: