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. 26, 2019	$ 804,168	$ 10,477	$ 22,489	$ (1,282)	$ 772,484
Beginning balance (shares) at Jan. 26, 2019		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 (loss) 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
Beginning balance at Jan. 25, 2020	$ 868,604	$ 10,528	30,158	(1,781)	829,699
Beginning balance (shares) at Jan. 25, 2020	31,583,938	31,583,938
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 242	$ 5	237
Stock options exercised (shares)		15,425
Stock-based compensation	2,322	$ 1	2,321
Stock-based compensation (shares)		1,428
Issuance of restricted stock, net of tax withholdings	(326)	$ 10	(336)
Issuance of restricted stock, net of tax withholdings (shares)		31,870
Other comprehensive loss	(31)			(31)
Net (loss) income	(32,418)				(32,418)
Ending balance at Apr. 25, 2020	$ 833,894	$ 10,544	28,352	$ (1,812)	$ 796,810
Ending balance (shares) at Apr. 25, 2020	31,632,661	31,632,661
Increase (Decrease) in Stockholders' Equity
Adjustments to Additional Paid in Capital, Equity Component of Convertible Debt			(3,971)
Adjustments to Additional Paid in Capital, Warrant Issued			(398)
Adjustment to Additional Paid In Capital Convertible Note Hedge			$ 341