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Net Income (Loss) per Share (Details 1) - shares
shares in Thousands
12 Months Ended
Jul. 31, 2020
Jul. 31, 2019
Jul. 31, 2018
Stock options      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Outstanding shares of common stock equivalents (in shares) 161,410 0 597,476
Stock awards      
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]      
Outstanding shares of common stock equivalents (in shares) 2,559,214 44,196 3,161,157