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CONVERTIBLE SENIOR NOTES - Interest Expense (Details) - Convertible Debt - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jan. 31, 2020
Jan. 31, 2019
Jan. 31, 2020
Jan. 31, 2019
Debt Instrument [Line Items]        
Interest expense related to amortization of debt discount $ 7,352 $ 6,883 $ 14,584 $ 13,653
Interest expense related to amortization of debt issuance costs 411 384 814 762
Total interest expense $ 7,763 $ 7,267 $ 15,398 $ 14,415