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FAIR VALUE MEASUREMENTS - Non-recurring Basis (Details) - Convertible Debt - USD ($) $ in Thousands	Oct. 31, 2020	Jul. 31, 2020
2023 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized discount	$ (72,573)	$ (80,298)
Unamortized debt issuance cost	(4,049)	(4,480)
2026 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unamortized discount	(227,723)
Unamortized debt issuance cost	(26,018)
Reported Value Measurement | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	994,637	490,222
Reported Value Measurement | Fair Value, Measurements, Nonrecurring | 2023 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	498,378	490,222
Reported Value Measurement | Fair Value, Measurements, Nonrecurring | 2026 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	496,259	0
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	1,399,794	529,385
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring | 2023 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	558,894	529,385
Estimate of Fair Value Measurement | Fair Value, Measurements, Nonrecurring | 2026 Convertible Senior Notes
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Convertible senior note, fair value disclosure	$ 840,900	$ 0

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Fair value portion of debt instrument payable, including, but not limited to, notes payable and loans payable.

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The remaining balance of debt issuance expenses that were capitalized and are being amortized against income over the lives of the respective bond issues. This does not include the amounts capitalized as part of the cost of the utility plant or asset.

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