Line of Credit (Line of Credit) (Details) (USD $)	3 Months Ended
May 02, 2015	Jan. 31, 2015
Debt Instrument [Line Items]
Servicing Fee	$ 12,000five_ServicingFee
Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility maximum borrowings	20,000,000	20,000,000
Increase in revolving credit facility	30,000,000
Issuance of letters of credit	5,000,000
Borrowing base percentage (percent)	90.00%
Percentage of unused credit facility fee (percent)	0.375%
Excess collateral availability percentage (percent)	10.00%
Revolving credit facility collateral amount	3,000,000
Letter of credit fee (percentage)	2.00%
Line of Credit Facility, Amount Outstanding		$ 0
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Excess Availability Greater Than Or Equal To 75% [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	0.75%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Excess Availability Less Than 75% But Greater Than Or Equal To 33% [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	1.00%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Excess Availability Less Than 33% [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	1.25%
Excess interest on available borrowings	33.00%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Minimum [Member] \| Excess Availability Greater Than Or Equal To 75% [Member]
Debt Instrument [Line Items]
Excess interest on available borrowings	75.00%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Minimum [Member] \| Excess Availability Less Than 75% But Greater Than Or Equal To 33% [Member]
Debt Instrument [Line Items]
Excess interest on available borrowings	33.00%
Revolving Credit Facility [Member] \| Prime Rate [Member] \| Maximum [Member] \| Excess Availability Less Than 75% But Greater Than Or Equal To 33% [Member]
Debt Instrument [Line Items]
Excess interest on available borrowings	75.00%
Revolving Credit Facility [Member] \| LIBOR Plus [Member] \| Excess Availability Greater Than Or Equal To 75% [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	1.75%
Revolving Credit Facility [Member] \| LIBOR Plus [Member] \| Excess Availability Less Than 75% But Greater Than Or Equal To 33% [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	2.00%
Revolving Credit Facility [Member] \| LIBOR Plus [Member] \| Excess Availability Less Than 33% [Member]
Debt Instrument [Line Items]
Interest rate on borrowings (percent)	2.25%
Revolving Credit Facility [Member] \| LIBOR Plus [Member] \| Minimum [Member] \| Excess Availability Greater Than Or Equal To 75% [Member]
Debt Instrument [Line Items]
Excess interest on available borrowings	75.00%
Revolving Credit Facility [Member] \| LIBOR Plus [Member] \| Minimum [Member] \| Excess Availability Less Than 75% But Greater Than Or Equal To 33% [Member]
Debt Instrument [Line Items]
Excess interest on available borrowings	33.00%
Revolving Credit Facility [Member] \| LIBOR Plus [Member] \| Maximum [Member] \| Excess Availability Less Than 75% But Greater Than Or Equal To 33% [Member]
Debt Instrument [Line Items]
Excess interest on available borrowings	75.00%

Excess Collateral Availability Percentage

No definition available.

Name:	five_ExcessCollateralAvailabilityPercentage
Namespace Prefix:	five_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

Letter Of Credit Fee Percentage

+ References

No definition available.

+ Details

Name:	five_LetterOfCreditFeePercentage
Namespace Prefix:	five_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Letters Of Credit Sublimit Under Credit Facility

+ References

No definition available.

+ Details

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

- Definition

Line Of Credit Facility Collateral Amount

+ References

No definition available.

+ Details

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

- Definition

Percentage Of Average Borrowing Availability Under Credit Facility

+ References

No definition available.

+ Details

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Namespace Prefix:	five_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Borrowing Base Of Line Of Credit Facility

+ References

No definition available.

+ Details

Name:	five_PercentageOfBorrowingBaseOfLineOfCreditFacility
Namespace Prefix:	five_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Percentage Of Unused Line Of Credit Facility Fee

+ References

No definition available.

+ Details

Name:	five_PercentageOfUnusedLineOfCreditFacilityFee
Namespace Prefix:	five_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Definition

Servicing Fee

+ References

No definition available.

+ Details

Name:	five_ServicingFee
Namespace Prefix:	five_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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

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Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

- Details

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Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-03.16)

-URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 19, 20, 22

-Article 5

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 944

-SubTopic 210

-Section S99

-Paragraph 1

-Subparagraph (SX 210.7-03.16)

-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

+ Details

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

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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=6877327&loc=d3e13212-122682

+ Details

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

- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-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=26873400&loc=d3e23780-122690

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 14

-Subparagraph (b)

-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3255-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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Namespace Prefix:
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Period Type: