Base compensation agreement commitment, Aggregate

No definition available.

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- Definition

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

+ 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 Bangladesh.

+ 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 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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- 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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- 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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- Definition

Concentration Risk, Percentage other than primary sourcing agent that represented more than 5% of total product purchases in the current fiscal year.

+ 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 suppliers from countries other than US.

+ 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 US suppliers.

+ References

No definition available.

+ Details

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- Definition

Concentration Risk Perecentage, No other country represented more than this percentage of total product purchases in the fiscal year.

+ References

No definition available.

+ Details

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- Details

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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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- 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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- Definition

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

+ References

No definition available.

+ Details

Name:	josb_PercentageOfRawMaterialsPurchasedForFinishedGoods
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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- 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 825

-SubTopic 10

-Section 50

-Paragraph 21

-Subparagraph (a)

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-Topic 825

-SubTopic 10

-Section 50

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-Name Accounting Standards Codification

-Topic 275

-SubTopic 10

-Section 50

-Paragraph 18

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- Definition

Amount of rent expense incurred for leased assets, including but not limited to, furniture and equipment, that is not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

+ References

No definition available.

+ Details

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- 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

-Glossary Contingent Rentals

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-Publisher FASB

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-Topic 840

-SubTopic 10

-Section 50

-Paragraph 2

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-Topic 840

-SubTopic 20

-Section 50

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-Name Accounting Standards Codification

-Topic 840

-SubTopic 10

-Section 55

-Paragraph 40

-Subparagraph (Note 3)

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-SubTopic 10

-Section 25

-Paragraph 35

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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)

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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

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-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

-Topic 946

-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 $) In Millions, unless otherwise specified	12 Months Ended
	Jan. 31, 2015	Feb. 01, 2014	Feb. 02, 2013	Jan. 28, 2012
Employment Agreements and Performance-Based Incentive Compensation [Abstract]
Base compensation agreement commitment, Aggregate		$ 2.9
Severance Oblications, Aggregate		4.3
Performance-based incentive compensation expense		1.7	2.1	7.8
Operating Leases, Future Contingent Rental Payments Due [Abstract]
Operating Leases, Future Contingent Rental Payments, Current		0.8
Operating Leases, Future Contingent Rental Payments, Due in Two Years		1.0
Operating Leases, Future Contingent Rental Payments, Due in Three Years		1.0
Operating Leases, Future Contingent Rental Payments, Due in Four Years		1.0
Operating Leases, Future Contingent Rental Payments, Due in Five Years		1.0
Operating Leases, Future Contingent Rental Payments, Due Thereafter		5.0
Operating Leases, Rent Expense		74.9	68.0	62.8
Operating Leases, Rent Expense, Contingent Rentals		3.0	4.0	3.6
Other Commitments [Abstract]
Professional Fees		0.8	0.8	0.8
Royalty Expense	$ 0.2	$ 0.2	$ 0.2	$ 0.2
Geographic Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk Percentage, US		1.00%
Concentration Risk Percentage, Sourced from Other Countries		99.00%
Concentration Risk Percentage, Mexico		28.00%
Concentration Risk Percentage, China		23.00%
Concentration Risk Percentage, India		11.00%
Concentration Risk Percentage, Malaysia		8.00%
Concentration Risk Percentage, Bangladesh		7.00%
Concentration Risk Perecentage, No other		5.00%
Supplier Concentration Risk [Member]
Concentration Risk [Line Items]
Concentration Risk, Percentage		52.00%
Concentration Risk, Percentage (Other)		6.00%
Percentage of Raw Materials Purchased for Finished Goods		9.00%
Number of Vendors Supplying Raw Materials		5
Concentration Risk Percentage, Major Raw Materials Suppliers		70.00%