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CONVERTIBLE SENIOR NOTES - Interest Expense (Details) - USD ($)
$ in Thousands
3 Months Ended
Oct. 31, 2020
Oct. 31, 2019
Debt Instrument [Line Items]    
Non-cash interest expense $ 1,952 $ 0
Convertible Debt | 2023 Convertible Senior Notes    
Debt Instrument [Line Items]    
Interest expense related to amortization of debt discount 7,725 7,232
Interest expense related to amortization of debt issuance costs 431 403
Total interest expense 8,156 $ 7,635
Convertible Debt | 2026 Convertible Senior Notes    
Debt Instrument [Line Items]    
Interest expense related to amortization of debt discount 3,187  
Interest expense related to amortization of debt issuance costs 365  
Non-cash interest expense 1,952  
Total interest expense $ 5,504