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Balance Sheet Components (Allowance for Doubtful Accounts) (Details) - USD ($)
$ in Thousands
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Accounts Receivable, Allowance for Credit Loss [Roll Forward]      
Allowances, beginning $ 1,441    
Charges to bad debt and revenue reserves 367 $ 670 $ 1,062
Write-offs, net (532)    
Allowances, ending $ 1,276 $ 1,441