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Revenue Recognition (Details) - USD ($)
$ in Millions
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Aug. 01, 2018
Revenue from Contract with Customer [Abstract]      
Cumulative effect of adoption     $ 9.1
Contract liability $ 32.3 $ 31.2  
Amortization of deferred customer contract acquisition costs $ 2.4 $ 1.8