Shareholders' Equity - Shareholder Protection Rights Plan - Additional Information (Detail) (USD $)	12 Months Ended
Jan. 31, 2015	Feb. 01, 2014
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock, par value	$ 0.01	$ 0.01
Shareholder Protection Rights Plan [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of purchase right of preferred share as dividend payable on each outstanding common stock		1
Common stock, par value		$ 0.01
Exercise price	$ 10.00
Redemption price per Right	$ 0.01
Percentage shareholders of common stock to call special meeting	10.00%
Expiry date New Rights Plan if approved by shareholders	Mar. 22, 2016
Shareholder Protection Rights Plan [Member] \| Minimum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of common stock acquired by a person or a group	20.00%
Shareholder Protection Rights Plan [Member] \| Maximum [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of common stock acquired by a person or a group	50.00%

Number Of Purchase Right Of Preferred Share As Dividend Payable On Each Outstanding Common Stock

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- Definition

Percentage Holders of Common Stock to Call Special Meeting

+ References

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- Definition

Redemption Price Per Right

+ References

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- Definition

Stockholder Rights Expiration Date If Approved By Shareholders

+ References

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- Definition

Exercise price per share or per unit of warrants or rights outstanding.

+ 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.(i)(4))

-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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- Definition

Face amount or stated value per share of common stock.

+ 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 210.5-02.29)

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 02

-Paragraph 30

-Article 5

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- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 323

-SubTopic 10

-Section 50

-Paragraph 3

-Subparagraph (a)(1)

-URI http://asc.fasb.org/extlink&oid=6382943&loc=d3e33918-111571

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