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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

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