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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

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