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Organization and Basis of Presentation (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands | Apr. 28, 2019 | Jan. 28, 2019 | Jan. 27, 2019 | Apr. 29, 2018
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets (1) | $ 11,981 |  |  |
Total operating lease liabilities | 12,764 |  |  |
Retained earnings | 588,224 |  | $ 574,930 |
Prepaid taxes | $ 11,186 |  | $ 8,406 |
ASU 2016-02 |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Operating lease right-of-use assets (1) |  | $ 13,000 |  |
Total operating lease liabilities |  | $ 13,800 |  |
Accounting Standards Update 2014-09 | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  |  | $ 11,100
Accounting Standards Update 2016-16 | Restatement Adjustment |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Retained earnings |  |  |  | 1,600
Deferred tax assets |  |  |  | 3,700
Prepaid taxes |  |  |  | $ 5,500

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