Share-Based Compensation (Restricted Stock Units Activity) (Details) - USD ($) $ / shares in Units, $ in Thousands		3 Months Ended		9 Months Ended
		Oct. 31, 2020	Nov. 02, 2019	Oct. 31, 2020	Nov. 02, 2019
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Exercise of Option, Tax Benefit		$ 0	$ 6	$ 0	$ 1,175
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at February 1, 2020				796,725
Number of Underlying Shares, Granted				0
Number of Underlying Shares, Forfeited				(382,225)
Number of Underlying Shares, Ending Balance at August 1, 2020		414,500		414,500
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at February 1, 2020				$ 40.06
Weighted-Average Grant Date Fair Value, Granted				0
Weighted-Average Grant Date Fair Value, Forfeited				47.87
Weighted-Average Grant Date Fair Value, Ending Balance at August 1, 2020		$ 32.86		$ 32.86
Service-based restricted stock units with $1.00 net income requirement [Member]
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Ending Balance at August 1, 2020		66,624		66,624
Service-based restricted stock units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 27,879		$ 27,879
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at February 1, 2020				1,676,831
Number of Underlying Shares, Granted				2,280,194
Number of Underlying Shares, Adjustments for performance achievement				0
Number of Underlying Shares, Vested				(790,429)
Number of Underlying Shares, Forfeited				(107,795)
Number of Underlying Shares, Ending Balance at August 1, 2020	[1]	3,058,801		3,058,801
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at February 1, 2020				$ 18.68
Weighted-Average Grant Date Fair Value, Granted				8.57
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement				0
Weighted-Average Grant Date Fair Value, Vested				17.42
Weighted-Average Grant Date Fair Value, Forfeited				13.83
Weighted-Average Grant Date Fair Value, Ending Balance at August 1, 2020		$ 11.63		$ 11.63
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 3 months 18 days
Performance-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 0		$ 0
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at February 1, 2020				747,056
Number of Underlying Shares, Granted				0
Number of Underlying Shares, Adjustments for performance achievement				38,381
Number of Underlying Shares, Vested				(481,304)
Number of Underlying Shares, Forfeited				(6,917)
Number of Underlying Shares, Ending Balance at August 1, 2020		297,216		297,216
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at February 1, 2020				$ 15.11
Weighted-Average Grant Date Fair Value, Granted				0
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement				11.37
Weighted-Average Grant Date Fair Value, Vested				9.63
Weighted-Average Grant Date Fair Value, Forfeited				22.80
Weighted-Average Grant Date Fair Value, Ending Balance at August 1, 2020		$ 22.43		$ 22.43
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				0 years
Market-based restricted stock units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount		$ 9,939		$ 9,939
Restricted Stock Unit Activity, Number of Underlying Shares
Number of Underlying Shares, Beginning Balance at February 1, 2020				421,784
Number of Underlying Shares, Granted				519,905
Number of Underlying Shares, Adjustments for performance achievement				134,122
Number of Underlying Shares, Vested				(350,447)
Number of Underlying Shares, Forfeited				(3,485)
Number of Underlying Shares, Ending Balance at August 1, 2020		721,879		721,879
Restricted Stock Unit Activity, Weighted-Average Grant Date Fair Value
Weighted-Average Grant Date Fair Value, Beginning Balance at February 1, 2020				$ 23.05
Weighted-Average Grant Date Fair Value, Granted				16.24	$ 36.24
Weighted-Average Grant Date Fair Value, Adjustments for performance achievement				11.79
Weighted-Average Grant Date Fair Value, Vested				11.79
Weighted-Average Grant Date Fair Value, Forfeited				35.61
Weighted-Average Grant Date Fair Value, Ending Balance at August 1, 2020		$ 21.46		$ 21.46
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Period for Recognition				1 year 1 month 6 days

[1] (1)    Includes 66,624 unvested restricted stock units as of October 31, 2020, subject to vesting requirements related to the achievement of certain performance metrics, such as operating income and net income, for the fiscal year immediately preceding the vesting date. Holders of these restricted stock units have the opportunity to earn back one or more installments of the award if the cumulative performance requirements are met in a subsequent year. (2)    Unvested shares related to restricted stock units with performance-based and market-based vesting conditions are reflected at 100% of their target vesting amount in the table above. Certain unvested shares related to restricted stock units with performance-based vesting conditions can be achieved at up to 200% of their target vesting amount.