Organization and Basis of Presentation (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	Apr. 28, 2019	Jan. 28, 2019	Jan. 27, 2019	Apr. 29, 2018
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