Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Jul. 29, 2017	Jan. 28, 2017	Jul. 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	$ (5,637)	$ (5,051)	$ (4,637)
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	(5,637)	(5,051)	(4,637)
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	(2,154)	(1,909)	(1,705)
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	(2,154)	(1,909)	(1,705)
Restricted stock units for non-employee directors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(9,088)	(9,390)	(9,060)
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	(9,088)	(9,390)	(9,060)
Performance share units
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value		(3,352)	(2,347)
Performance share units | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value		(3,352)	(2,347)
Cash equivalents - money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	16,163	27,530	132,320
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	16,163	27,530	132,320
Non-qualified deferred compensation plan assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	5,637	5,051	4,637
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	5,637	5,051	4,637
Derivative Financial Instruments, Liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(165)	(640)	(200)
Derivative Financial Instruments, Liabilities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	$ (165)	$ (640)	(200)
Secured convertible note [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value			7,190
Secured convertible note [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value			$ 7,190