Condensed Consolidated Statements Of Comprehensive Income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 27, 2019	Oct. 28, 2018	Oct. 27, 2019	Oct. 28, 2018
Net income	$ 17,599	$ 12,165	$ 36,259	$ 49,716
Other comprehensive income (loss), net:
Unrealized gain on available-for-sale securities	195	0	195	0
Change in employee benefit plans, net	68	(16)	204	(48)
Other comprehensive income (loss), net	426	3	292	(121)
Comprehensive income	18,025	12,168	36,551	49,595
Foreign Exchange Contract [Member]
Other comprehensive income (loss), net:
Unrealized gain (loss) on foreign currency cash flow hedges, net	30	8	(249)	(109)
Realized loss on foreign currency cash flow hedges, net	$ 133	$ 11	$ 142	$ 36