Stock-Based Compensation (Details 2) (USD $)	6 Months Ended
Jul. 28, 2012
1.81 - 2.74 [Member]
Stock options outstanding
Number outstanding as of July 28, 2012	27,500
Weighted Average Remaining Contractual Life (in years)	3 years 10 months 21 days
Weighted Average Exercise Price Per Share	$ 2.57
Number Exercisable as of July 28, 2012, Options Exercisable	7,500
Weighted Average Exercise Price Per Share, Options Exercisable	$ 2.26
Range of Exercise Prices Lower Limit	$ 1.81
Range of Exercise Prices Upper Limit	$ 2.74
2.93 - 4.44 [Member]
Stock options outstanding
Number outstanding as of July 28, 2012	2,398,133
Weighted Average Remaining Contractual Life (in years)	2 years 8 months 19 days
Weighted Average Exercise Price Per Share	$ 3.71
Number Exercisable as of July 28, 2012, Options Exercisable	1,220,999
Weighted Average Exercise Price Per Share, Options Exercisable	$ 3.72
Range of Exercise Prices Lower Limit	$ 2.93
Range of Exercise Prices Upper Limit	$ 4.44
4.50 - 6.82 [Member]
Stock options outstanding
Number outstanding as of July 28, 2012	105,499
Weighted Average Remaining Contractual Life (in years)	2 years 6 months 26 days
Weighted Average Exercise Price Per Share	$ 5.54
Number Exercisable as of July 28, 2012, Options Exercisable	68,832
Weighted Average Exercise Price Per Share, Options Exercisable	$ 5.97
Range of Exercise Prices Lower Limit	$ 4.50
Range of Exercise Prices Upper Limit	$ 6.82
8.00 - 11.49 [Member]
Stock options outstanding
Number outstanding as of July 28, 2012	214,000
Weighted Average Remaining Contractual Life (in years)	8 months 5 days
Weighted Average Exercise Price Per Share	$ 8.64
Number Exercisable as of July 28, 2012, Options Exercisable	214,000
Weighted Average Exercise Price Per Share, Options Exercisable	$ 8.64
Range of Exercise Prices Lower Limit	$ 8.00
Range of Exercise Prices Upper Limit	$ 11.49
1.81 - 11.49 [Member]
Stock options outstanding
Number outstanding as of July 28, 2012	2,745,132
Weighted Average Remaining Contractual Life (in years)	2 years 6 months 26 days
Weighted Average Exercise Price Per Share	$ 4.15
Number Exercisable as of July 28, 2012, Options Exercisable	1,511,331
Weighted Average Exercise Price Per Share, Options Exercisable	$ 4.51
Range of Exercise Prices Lower Limit	$ 1.81
Range of Exercise Prices Upper Limit	$ 11.49

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Weighted average exercise price as of the balance sheet date for those equity-based payment arrangements exercisable and outstanding.

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- Definition

The floor of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph 64

-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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-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (g)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding exercisable stock options as of the balance sheet date in the customized range of exercise prices for which the market and performance vesting condition has been satisfied.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(c)

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(iii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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- Definition

The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 718

-SubTopic 10

-Section 50

-Paragraph 2

-Subparagraph (c)(1)(i)-(ii)

-URI http://asc.fasb.org/extlink&oid=6415400&loc=d3e5070-113901

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-Name Statement of Financial Accounting Standard (FAS)

-Number 123R

-Paragraph A240

-Subparagraph b(1)(a, b)

-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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- Definition

The weighted average price as of the balance sheet date at which grantees could acquire the underlying shares with respect to all outstanding stock options which are in the customized range of exercise prices.

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Weighted average remaining contractual term of outstanding stock options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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- Definition

The ceiling of a customized range of exercise prices for purposes of disclosing shares potentially issuable under outstanding stock option awards on all stock option plans and other required information pertaining to awards in the customized range.

+ References

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