Line of Credit Facility, Maximum Election To Increase Borrowing Capacity

No definition available.

Name:	five_LineOfCreditFacilityMaximumElectionToIncreaseBorrowingCapacity
Namespace Prefix:	five_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of Credit Borrowed and Repaid During Period

+ References

No definition available.

+ Details

Name:	five_LineofCreditBorrowedandRepaidDuringPeriod
Namespace Prefix:	five_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Definition

Line of Credit Facility, Accordion Feature, Increase Limit

+ References

No definition available.

+ Details

Name:	five_LineofCreditFacilityAccordionFeatureIncreaseLimit
Namespace Prefix:	five_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Minimum Availability Of Aggregate Commitments And Loan Cap Required, Percent

+ References

No definition available.

+ Details

Name:	five_MinimumAvailabilityOfAggregateCommitmentsAndLoanCapRequiredPercent
Namespace Prefix:	five_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum Availability Of Loan Cap During Diligence Deferral Period

+ References

No definition available.

+ Details

Name:	five_MinimumAvailabilityOfLoanCapDuringDiligenceDeferralPeriod
Namespace Prefix:	five_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Minimum Availability Of Loan Cap Outside Of Diligence Deferral Period

+ References

No definition available.

+ Details

Name:	five_MinimumAvailabilityOfLoanCapOutsideOfDiligenceDeferralPeriod
Namespace Prefix:	five_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Period Required For Availability Of Loan Cap Requirement

+ References

No definition available.

+ Details

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

- Definition

Percentage points added to the reference rate to compute the variable rate on the debt instrument.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- 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

Name:	us-gaap_DebtInstrumentLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682

+ Details

Name:	us-gaap_LineOfCreditFacilityCurrentBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

+ References

+ Details

Name:	us-gaap_LineOfCreditFacilityRemainingBorrowingCapacity
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

- Definition

The fee, expressed as a percentage of the line of credit facility, for available but unused credit capacity under the credit facility.

+ References

No definition available.

+ Details

Name:	us-gaap_LineOfCreditFacilityUnusedCapacityCommitmentFeePercentage
Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 15
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=123570139&loc=d3e3291-108585

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690

+ Details

Name:	us-gaap_RepaymentsOfLinesOfCredit
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

- Details

Name:	us-gaap_LongtermDebtTypeAxis=us-gaap_LineOfCreditMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=five_AmendedRevolvingCreditFacilityMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_CreditFacilityAxis=five_TheFirstAmendementMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_BaseRateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	srt_RangeAxis=srt_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

Term Loan and Line of Credit (Financing Transactions) (Details) - USD ($)		12 Months Ended
	Sep. 16, 2022	Jan. 28, 2023	Jan. 29, 2022	Jan. 30, 2021
Debt Instrument [Line Items]
Repayment of note payable under Revolving Credit Facility		$ 0	$ 0	$ 50,000,000
Line of Credit [Member]
Debt Instrument [Line Items]
Repayment of note payable under Revolving Credit Facility				$ 50,000,000
Amended Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Borrowed and Repaid During Period		0
Amended Revolving Credit Facility [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Accordion Feature, Increase Limit	$ 150,000,000
Minimum Availability Of Aggregate Commitments And Loan Cap Required, Percent	15.00%
Period Required For Availability Of Loan Cap Requirement	60 days
Line of Credit Facility, Remaining Borrowing Capacity		192,000,000	$ 153,000,000
The First Amendement [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Election To Increase Borrowing Capacity	$ 50,000,000
Line of Credit Facility, Current Borrowing Capacity		$ 225,000,000
The First Amendement [Member] \| Line of Credit [Member]
Debt Instrument [Line Items]
Minimum Availability Of Loan Cap During Diligence Deferral Period	12.50%
Minimum Availability Of Loan Cap Outside Of Diligence Deferral Period	10.00%
The First Amendement [Member] \| Line of Credit [Member] \| Minimum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.125%
The First Amendement [Member] \| Line of Credit [Member] \| Minimum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	1.12%
The First Amendement [Member] \| Line of Credit [Member] \| Minimum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	0.125%
The First Amendement [Member] \| Line of Credit [Member] \| Maximum [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage	1.50%
The First Amendement [Member] \| Line of Credit [Member] \| Maximum [Member] \| Base Rate [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	1.50%
The First Amendement [Member] \| Line of Credit [Member] \| Maximum [Member] \| London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	0.50%