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EQUITY AWARD PLANS - Stock Based Compensation Expense (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Apr. 30, 2020
Apr. 30, 2019
Apr. 30, 2020
Apr. 30, 2019
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense $ 92,096 $ 94,832 $ 259,137 $ 233,322
Cost of revenue, product        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 1,367 953 3,937 2,523
Cost of revenue, support, entitlements, and other services        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 5,959 4,542 15,850 11,072
Sales and marketing        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 33,177 35,257 92,137 81,325
Research and development        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense 39,462 42,265 113,484 107,953
General and administrative        
Share-based Payment Arrangement, Expensed and Capitalized, Amount [Line Items]        
Total stock-based compensation expense $ 12,131 $ 11,815 $ 33,729 $ 30,449