Summary of Significant Accounting Policies - Cumulative Effect of Revenue Recognition on Balance Sheets (Details) - USD ($) $ in Thousands	May 05, 2018	Feb. 04, 2018	Feb. 03, 2018	Apr. 29, 2017
Current assets:
Prepaids and other current assets	$ 71,720	$ 69,771	$ 67,234	$ 63,899
Inventories	552,475	537,837	542,625	578,102
Deferred income taxes	24,842	23,509	25,077	15,289
Current liabilities:
Other accrued liabilities	53,502	63,988	72,220	65,424
Equity
Retained earnings	605,984	608,315	603,902	$ 716,108
Calculated under Revenue Guidance in Effect before Topic 606
Current assets:
Prepaids and other current assets	69,111		67,234
Inventories	556,442		542,625
Deferred income taxes	26,584		25,077
Current liabilities:
Other accrued liabilities	61,684		72,220
Equity
Retained earnings	600,886		$ 603,902
Accounting Standards Update 2014-09 | Difference between Revenue Guidance in Effect before and after Topic 606
Current assets:
Prepaids and other current assets	2,609	2,537
Inventories	(3,967)	(4,788)
Deferred income taxes	(1,742)	(1,568)
Current liabilities:
Other accrued liabilities	(8,182)	(8,232)
Equity
Retained earnings	$ 5,098	$ 4,413