Income Taxes (Details) (USD $) | 3 Months Ended | 9 Months Ended | ||
|---|---|---|---|---|
Oct. 30, 2011 | Oct. 31, 2010 | Oct. 30, 2011 | Oct. 31, 2010 | |
| Income Tax Contingency [Line Items] | ||||
| Income tax expense | $ 26,514,000 | $ 18,723,000 | $ 73,754,000 | $ 3,768,000 |
| Effective tax rate | 13.00% | 18.10% | 13.70% | 4.40% |
| Unrecognized Tax Benefits | 28,100,000 | 28,100,000 | ||
| unrecognizedtaxbenefit | 16,100,000 | 16,100,000 | ||
| United States federal statutory rate | 35.00% | |||
| Annual projected effective tax rate | 15.20% | 18.80% | ||
| Unrecognized tax benefit recorded in non current income taxes payable | 8,100,000 | |||
| Unrecognized tax benefit reflected in related DTA | 20,000,000 | |||
| Unrecognized Tax Benefits Reductions Resulting From Lapse Of Applicable Statute Of Limitations | 7,500,000 | |||
Icera Business Acquisition [Member] | ||||
| Income Tax Contingency [Line Items] | ||||
| Unrecognized Tax Benefits | $ 12,000,000 | $ 12,000,000 | ||
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- Definition The annual projected domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate shall be the regular tax rate if there are alternative tax systems.
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- Definition The gross amounts of increases in unrecognized tax benefits as of the balance sheet date in connection with the acquisition of Icera pertaining to uncertain tax positions taken during a prior period.
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- Definition Represents the portion of unrecognized tax benefit recorded in non-current income taxes payable.
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- Definition Represents the portion of unrecognized tax benefit reflected as a reduction to the related deferred tax asset.
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- Definition A ratio calculated by dividing the reported amount of income tax expense attributable to continuing operations for the period by GAAP-basis pretax income from continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The domestic federal statutory tax rate applicable under enacted tax laws to the Company's pretax income from continuing operations for the period. The "statutory" tax rate is the regular tax rate if there are alternative tax systems. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.
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- Definition The sum of the current income tax expense or benefit and the deferred income tax expense or benefit pertaining to continuing operations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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