Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2021	Aug. 01, 2020	Aug. 03, 2019
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	$ 401,037	$ 396,000	$ 315,072
Net change in AOCI	683	2,915	(187)
Stockholders' equity, ending balance	460,849	401,037	396,000
Gains (losses) on available-for-sale securities	430	430
Total
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	2,728	(187)	0
Other comprehensive income (loss) before reclassifications	828	2,975
Amounts reclassified from AOCI	(145)	(60)
Net change in AOCI	683	2,915	(187)
Stockholders' equity, ending balance	3,411	2,728	(187)
Available-for-sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	1,213	391
Other comprehensive income (loss) before reclassifications	(1,358)	882
Amounts reclassified from AOCI	(145)	(60)
Net change in AOCI	(1,503)	822
Stockholders' equity, ending balance	(290)	1,213	391
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Stockholders' equity, beginning balance	1,515	(578)
Other comprehensive income (loss) before reclassifications	2,186	2,093
Amounts reclassified from AOCI	0	0
Net change in AOCI	2,186	2,093
Stockholders' equity, ending balance	$ 3,701	$ 1,515	$ (578)