Fair Value Measurements (Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis) (Details) - USD ($) $ in Thousands	Oct. 29, 2016	Jan. 30, 2016	Oct. 31, 2015
Cash equivalents - money market funds [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	$ 152,700	$ 100,694	$ 64,783
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	152,700	100,694	64,783
Cash equivalents - money market funds [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	0	0	0
Cash equivalents - money market funds [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	0	0	0
Non-qualified deferred compensation plan assets [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	4,747	3,383	3,928
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	4,747	3,383	3,928
Non-qualified deferred compensation plan assets [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	0	0	0
Non-qualified deferred compensation plan assets [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	0	0	0
Derivative financial instruments, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value		154
Derivative financial instruments, net [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value		0
Derivative financial instruments, net [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value		154
Derivative financial instruments, net [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value		0
Secured convertible note [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	7,227	7,117	7,188
Secured convertible note [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	0	0	0
Secured convertible note [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	0	0	0
Secured convertible note [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Asset, Fair Value	7,227	7,117	7,188
Non-qualified deferred compensation plan liabilities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(4,747)	(3,383)	(3,928)
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	(4,747)	(3,383)	(3,928)
Non-qualified deferred compensation plan liabilities [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
Non-qualified deferred compensation plan liabilities [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
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	(1,596)	(1,728)	(1,932)
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	(1,596)	(1,728)	(1,932)
Deferred compensation plan liabilities for non-employee directors [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
Deferred compensation plan liabilities for non-employee directors [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
Restricted stock units for non-employee directors [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(8,726)	(8,879)	(9,792)
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	(8,726)	(8,879)	(9,792)
Restricted stock units for non-employee directors [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
Restricted stock units for non-employee directors [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
Performance share units
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(2,446)	(3,780)	(3,981)
Performance share units | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(2,446)	(3,780)	(3,981)
Performance share units | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	0	0
Performance share units | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0	$ 0	0
Derivative financial instruments, net [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(208)		(85)
Derivative financial instruments, net [Member] | Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	0		0
Derivative financial instruments, net [Member] | Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	(208)		(85)
Derivative financial instruments, net [Member] | Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Liability, Fair Value	$ 0		$ 0