Income and Other Taxes - Effective Tax Rate (Details) - USD ($) $ in Thousands	12 Months Ended
Feb. 03, 2017	Jan. 29, 2016	Jan. 30, 2015
Income Tax Disclosure [Abstract]
Loss before income taxes	$ (63,477)	$ (112,577)	$ (61,235)
Income tax benefit	$ (25,264)	$ (40,196)	$ (22,745)
U.S. federal statutory rate	35.00%	35.00%	35.00%
Foreign income taxed at different rates	(0.30%)	(0.90%)	(0.70%)
State income taxes, net of federal tax benefit	3.20%	1.90%	2.80%
Research and development credits	3.10%	0.50%	0.00%
Nondeductible/nontaxable items	(1.20%)	(0.80%)	(0.00%)
Total	39.80%	35.70%	37.10%

Effective Income Tax Rate Reconciliation, Nondeductible Expense And Tax Exempt Income, Percent

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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Percentage of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations applicable to statutory income tax expense (benefit) outside of the country of domicile.

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Amount of income (loss) from continuing operations, including income (loss) from equity method investments, before deduction of income tax expense (benefit), and income (loss) attributable to noncontrolling interest.

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