Base compensation agreement commitment, Aggregate

No definition available.

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from Bangladesh.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from China.

+ References

No definition available.

+ Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from India.

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Discloses a concentration risk that represents the percentage of raw material purchased from one or more supplier(s).

+ References

No definition available.

+ Details

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Period Type:	instant

- Definition

Concentration Risk Percentage, Malaysia

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from Mexico.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from suppliers from countries other than US.

+ References

No definition available.

+ Details

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Data Type:	num:percentItemType
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Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from Sri Lanka.

+ References

No definition available.

+ Details

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Balance Type:	na
Period Type:	instant

- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, this concept represents the concentration percentage of inventory purchases sourced from US suppliers.

+ References

No definition available.

+ Details

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Namespace Prefix:	josb_
Data Type:	num:percentItemType
Balance Type:	na
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- Details

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Balance Type:	na
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- Definition

Number of vendors supplying Raw materials that the Company purchased to produce finished goods.

+ References

No definition available.

+ Details

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Namespace Prefix:	josb_
Data Type:	xbrli:integerItemType
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- Definition

Operating Leases, Future Contingent Rental Payments, Current - For unopened stores

+ References

No definition available.

+ Details

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- Details

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- Definition

Operating Leases, Future Contingent Rental Payments, Due in Five Years - For unopened stores.

+ References

No definition available.

+ Details

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- Definition

Operating Leases, Future Contingent Rental Payments, Due in Four Years - For unopened stores.

+ References

No definition available.

+ Details

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- Definition

Operating Leases, Future Contingent Rental Payments, Due in Three Years - For unopened stores.

+ References

No definition available.

+ Details

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Data Type:	xbrli:monetaryItemType
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- Definition

Operating Leases, Future Contingent Rental Payments, Due in Two Years - for unopened stores

+ References

No definition available.

+ Details

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- Definition

Operating Leases, Future Contingent Rental Payments, Due thereafter - For unopened stores.

+ References

No definition available.

+ Details

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- Details

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- Definition

Percentage of raw materials the company purchased for our finished goods.

+ References

No definition available.

+ Details

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Namespace Prefix:	josb_
Data Type:	num:percentItemType
Balance Type:	na
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- Definition

Severance Oblications, Aggregate

+ References

No definition available.

+ Details

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Balance Type:	na
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- Details

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- Definition

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 20

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-Name Accounting Standards Codification

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-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

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- Definition

Rental expense incurred for leased assets including furniture and equipment which has not been recognized in costs and expenses applicable to sales and revenues; for example, cost of goods sold or other operating costs and expenses.

+ References

No definition available.

+ Details

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

- Definition

The increases or decreases in lease payments that result from changes occurring after the inception of the lease in the factors (other than the passage of time) on which lease payments are based, except that any escalation of minimum lease payments relating to increases in construction or acquisition cost of the leased property or for increases in some measure of cost or value during the construction or preconstruction period, are excluded from contingent rentals. Contingent rentals also may include amounts for which the triggering events have not yet occurred or the specified targets for which have not yet been achieved (such as sales based percentage rent), but which events are considered probable of occurring or which specified targets are considered probable of being achieved.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 40

-Paragraph 1

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-Publisher FASB

-Name Emerging Issues Task Force (EITF)

-Number 98-9

-Paragraph 17

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Contingent Rentals

-URI http://asc.fasb.org/extlink&oid=6508509

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-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 13

-Paragraph 106, 122

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Number 13

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-Subparagraph c

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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-Name Accounting Standards Codification

-Topic 840

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-SubTopic 20

-Section 50

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-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

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- Definition

Amount of payroll tax expense, compensation, postemployment and benefit-related expenses not elsewhere specified in the taxonomy (such as health plan, profit sharing, incentives, tuition reimbursement, other fringe benefits and perquisites) incurred in the period.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.4)

-URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688

+ Details

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- Definition

A fee charged for services from professionals such as doctors, lawyers and accountants. The term is often expanded to include other professions, for example, pharmacists charging to maintain a medicinal profile of a client or customer.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 946

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.6-07.2(a),(b),(c),(d))

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-Name Accounting Standards Codification

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-SubTopic 225

-Section 45

-Paragraph 3

-Subparagraph (k)

-URI http://asc.fasb.org/extlink&oid=6488370&loc=d3e13550-115849

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- Definition

Amount of expense related to royalty payments under a contractual arrangement such as payment for mineral and drilling rights and use of technology or intellectual property.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

-SubTopic 10

-Section S99

-Paragraph 2

-Subparagraph (SX 210.5-03.3)

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Commitments and Contingencies (Narrative) (Details) (USD $)	12 Months Ended
	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012	Jan. 29, 2011	Jan. 30, 2010
Employment Agreements and Performance-Based Incentive Compensation [Abstract]
Base compensation agreement commitment, Aggregate			$ 5,100,000
Severance Oblications, Aggregate			4,300,000
Performance-based incentive compensation expense			7,800,000	9,200,000	8,500,000
Operating Leases, Future Contingent Rental Payments Due [Abstract]
Operating Leases, Future Contingent Rental Payments, Current			161,000
Operating Leases, Future Contingent Rental Payments, Due in Two Years			383,000
Operating Leases, Future Contingent Rental Payments, Due in Three Years			383,000
Operating Leases, Future Contingent Rental Payments, Due in Four Years			383,000
Operating Leases, Future Contingent Rental Payments, Due in Five Years			383,000
Operating Leases, Future Contingent Rental Payments, Due Thereafter			2,427,000
Operating Leases, Rent Expense			62,800,000	57,000,000	52,000,000
Operating Leases, Rent Expense, Contingent Rentals			3,600,000	2,500,000	2,200,000
Other Commitments [Abstract]
Professional Fees	825,000	825,000	825,000	825,000	825,000
Royalty Expense		$ 165,000	$ 165,000	$ 165,000	$ 165,000
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk Percentage, US			2.00%
Concentration Risk Percentage, Sourced from Other Countries			98.00%
Concentration Risk Percentage, China			33.00%
Concentration Risk Percentage, Mexico			23.00%
Concentration Risk Percentage, Bangladesh			8.00%
Concentration Risk Percentage, Malaysia			8.00%
Concentration Risk Percentage, India			7.00%
Concentration Risk Percentage, Sri Lanka			6.00%
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage			57.00%
Percentage of Raw Materials Purchased for Finished Goods			9.00%
Number of Vendors Supplying Raw Materials			5
Concentration Risk Percentage, Major Raw Materials Suppliers			69.00%