CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS’ EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Cumulative effect from implementation of ASU 2016-13	Common Stock [Member]	Additional Paid-in Capital [Member]	AOCI Attributable to Parent [Member]	Retained Earnings [Member]	Retained Earnings [Member] Cumulative effect from implementation of ASU 2016-13
Beginning balance at Jan. 25, 2020	$ 868,604	$ (471)	$ 10,528	$ 30,158	$ (1,781)	$ 829,699	$ (471)
Beginning balance (shares) at Jan. 25, 2020			31,583,938
Increase (Decrease) in Stockholders' Equity
Stock options exercised	3,608		$ 71	3,537
Stock options exercised (shares)			212,527
Stock-based compensation	6,694		$ 1	6,693
Stock-based compensation (shares)			3,348
Issuance of restricted stock, net of tax withholdings	(329)		$ 12	(341)
Issuance of restricted stock, net of tax withholdings (shares)			37,117
Equity component of the settlement of 0.75% convertible senior notes due 2021, net of taxes	(8,975)			(8,975)
Purchase of warrants	(7,176)			(7,176)
Settlement of convertible note hedges related to extinguishment of convertible debt	7,197			7,197
Other comprehensive loss	(10)				(10)
Net income	4,606					4,606
Ending balance at Jul. 25, 2020	873,748		$ 10,612	31,093	(1,791)	833,834
Ending balance (shares) at Jul. 25, 2020			31,836,930
Beginning balance at Apr. 25, 2020	833,894		$ 10,544	28,352	(1,812)	796,810
Beginning balance (shares) at Apr. 25, 2020			31,632,661
Increase (Decrease) in Stockholders' Equity
Stock options exercised	3,365		$ 65	3,300
Stock options exercised (shares)			197,102
Stock-based compensation	4,373		$ 1	4,372
Stock-based compensation (shares)			1,920
Issuance of restricted stock, net of tax withholdings	(3)		$ 2	(5)
Issuance of restricted stock, net of tax withholdings (shares)			5,247
Equity component of the settlement of 0.75% convertible senior notes due 2021, net of taxes	(5,004)			(5,004)
Purchase of warrants	(6,777)			(6,777)
Settlement of convertible note hedges related to extinguishment of convertible debt	6,855			6,855
Other comprehensive loss	21				21
Net income	37,024					37,024
Ending balance at Jul. 25, 2020	873,748		$ 10,612	31,093	(1,791)	833,834
Ending balance (shares) at Jul. 25, 2020			31,836,930
Beginning balance at Jan. 30, 2021	$ 811,308		$ 10,205	2,284	(1,769)	800,588
Beginning balance (shares) at Jan. 30, 2021	30,615,167		30,615,167
Increase (Decrease) in Stockholders' Equity
Stock options exercised	$ 366		$ 4	362
Stock options exercised (shares)			11,169
Stock-based compensation	6,049			6,049
Stock-based compensation (shares)			1,241
Issuance of restricted stock, net of tax withholdings	(6,365)		$ 59	(2,592)		(3,832)
Issuance of restricted stock, net of tax withholdings (shares)			174,137
Repurchase of common stock (in shares)			(631,638,000)
Repurchase of common stock	(50,000)		$ (211)	(3,793)		(45,996)
Other comprehensive loss	1				1
Net income	19,063					19,063
Ending balance at Jul. 31, 2021	$ 780,421		$ 10,057	2,309	(1,768)	769,823
Ending balance (shares) at Jul. 31, 2021	30,170,076		30,170,076
Beginning balance at May. 01, 2021	$ 809,953		$ 10,259	3,807	(1,767)	797,654
Beginning balance (shares) at May. 01, 2021			30,778,154
Increase (Decrease) in Stockholders' Equity
Stock-based compensation	2,309			2,309
Stock-based compensation (shares)			537
Issuance of restricted stock, net of tax withholdings	(5)		$ 9	(14)
Issuance of restricted stock, net of tax withholdings (shares)			23,023
Repurchase of common stock (in shares)			(631,638,000)
Repurchase of common stock	(50,000)		$ (211)	(3,793)		(45,996)
Other comprehensive loss	(1)				(1)
Net income	18,165					18,165
Ending balance at Jul. 31, 2021	$ 780,421		$ 10,057	$ 2,309	$ (1,768)	$ 769,823
Ending balance (shares) at Jul. 31, 2021	30,170,076		30,170,076