Shareholders' Equity (Deficit) (Common Stock) (Details) - USD ($)	1 Months Ended	12 Months Ended
	Mar. 31, 2012	Jan. 30, 2016	Jan. 31, 2015	Feb. 01, 2014	Sep. 27, 2012
Class of Stock [Line Items]
Options cancelled (shares)	2,020,620		20,000	35,300
Percentage of shares vested (percent)		33.00%	33.00%	33.00%
Compensation expense	$ 17,400,000	$ 11,200,000	$ 5,900,000	$ 10,100,000
Expenses on date of modification	$ 5,300,000
Stock options vesting period from the date of grant (years)	2 years
Common stock, shares authorized		120,000,000	120,000,000
Repayment of Term Loan Facility		$ 0	$ 19,500,000	$ 15,000,000
Number of shares of common stock reserved for issuance (shares)					500,000
Discount on common stock fair value for employee purchases (percent)					10.00%
Stock Issued During Period, Shares, Employee Stock Purchase Plans		178,000	179,000	148,000
Employee stock purchase plan [Member]
Class of Stock [Line Items]
Compensation expense		$ 16,500	$ 16,400	$ 13,500
Proceeds from issuance of common stock		$ 200,000	$ 200,000	$ 100,000
Stock Issued During Period, Shares, Employee Stock Purchase Plans		5,018	4,345	3,565
Common stock [Member]
Class of Stock [Line Items]
Stock Issued During Period, Shares, Employee Stock Purchase Plans		5,018	4,345	3,565
Performance Based Vesting Schedule [Member]
Class of Stock [Line Items]
Options cancelled (shares)	1,010,310