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Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	12 Months Ended
	Aug. 03, 2019	Jul. 28, 2018	Jul. 29, 2017
Stockholders' equity, beginning balance	$ 315,072	$ 61,861	$ 49,947
Other comprehensive income (loss) before reclassifications	(187)
Net change in AOCI	(187)	0	0
Stockholders' equity, ending balance	396,000	315,072	61,861
Losses on available-for-sale securities	133
Available-for-sale Securities
Stockholders' equity, beginning balance	0
Other comprehensive income (loss) before reclassifications	391
Net change in AOCI	391
Stockholders' equity, ending balance	391	0
Foreign Currency Translation
Stockholders' equity, beginning balance	0
Other comprehensive income (loss) before reclassifications	(578)
Net change in AOCI	(578)
Stockholders' equity, ending balance	(578)	0
Total
Stockholders' equity, beginning balance	0	0	0
Net change in AOCI	(187)
Stockholders' equity, ending balance	$ (187)	$ 0	$ 0

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Amount after tax, before reclassification adjustments, of other comprehensive income (loss), attributable to parent.

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