XML 26 R39.htm IDEA: XBRL DOCUMENT v3.19.3
Property and Equipment, net - Additional Information (Details) - USD ($)
$ in Millions
12 Months Ended
Aug. 03, 2019
Jul. 28, 2018
Jul. 29, 2017
Property, Plant and Equipment [Abstract]      
Depreciation and amortization expense $ 16.1 $ 10.5 $ 7.7