Organization and Basis of Presentation (Recent Accounting Pronouncements) (Details) - USD ($) $ in Thousands	9 Months Ended
	Oct. 28, 2018	Apr. 29, 2018	Jan. 28, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Document Fiscal Year Focus	2019
Retained earnings	$ 561,589		$ 502,346
Prepaid taxes	$ 11,093		$ 11,809
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		1,800
Deferred tax assets		3,700
Prepaid taxes		$ 5,500