CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY Statement - USD ($) $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]
Beginning balance at Jan. 27, 2018	$ 724,996	$ 10,395	$ 6,170	$ (1,146)	$ 709,577
Beginning balance (shares) at Jan. 27, 2018		31,185,669
Increase (Decrease) in Stockholders' Equity
Stock options exercised	67	$ 2	65
Stock options exercised (shares)		5,084
Stock-based compensation	4,863	$ 1	4,862
Stock-based compensation (shares)		424
Issuance of restricted stock, net of tax withholdings	(87)	$ 0	(87)
Issuance of restricted stock, net of tax withholdings (shares)		1,892
Other comprehensive loss	(88)			(88)
Net income	17,231				17,231
Ending balance at Apr. 28, 2018	746,982	$ 10,398	11,010	(1,234)	726,808
Ending balance (shares) at Apr. 28, 2018		31,193,069
Beginning balance at Jan. 26, 2019	$ 804,168	$ 10,477	22,489	(1,282)	772,484
Beginning balance (shares) at Jan. 26, 2019	31,430,031	31,430,031
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 106	$ 3	103
Stock options exercised (shares)		9,850
Stock-based compensation	3,479	$ 1	3,478
Stock-based compensation (shares)		1,528
Issuance of restricted stock, net of tax withholdings	(841)	$ 12	(853)
Issuance of restricted stock, net of tax withholdings (shares)		37,442
Other comprehensive loss	(14)			(14)
Net income	14,279				14,279
Ending balance at Apr. 27, 2019	$ 821,177	$ 10,493	$ 25,217	$ (1,296)	$ 786,763
Ending balance (shares) at Apr. 27, 2019	31,478,851	31,478,851