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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