Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Apr. 29, 2017	Jan. 28, 2017	Apr. 30, 2016
Non-qualified deferred compensation plan liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	$ (5,402)	$ (5,051)	$ (4,557)
Non-qualified deferred compensation plan liabilities [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(5,402)	(5,051)	(4,557)
Deferred compensation plan liabilities for non-employee directors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(2,189)	(1,909)	(1,657)
Deferred compensation plan liabilities for non-employee directors [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(2,189)	(1,909)	(1,657)
Restricted stock units for non-employee directors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(9,276)	(9,390)	(8,576)
Restricted stock units for non-employee directors [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(9,276)	(9,390)	(8,576)
Performance share units
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value		(3,352)	(1,838)
Performance share units | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value		(3,352)	(1,838)
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value		(640)	(347)
Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value		(640)	(347)
Cash equivalents - money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	43,531	27,530	129,576
Cash equivalents - money market funds [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	43,531	27,530	129,576
Non-qualified deferred compensation plan assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	5,402	5,051	4,557
Non-qualified deferred compensation plan assets [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	5,402	$ 5,051	4,557
Derivative Financial Instruments, Assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	423
Derivative Financial Instruments, Assets [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	$ 423
Secured convertible note [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value			7,153
Secured convertible note [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value			$ 7,153