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FAIR VALUE MEASUREMENTS - Non-recurring Basis (Details) - Convertible Debt - USD ($) $ in Thousands | Oct. 31, 2020 | Jul. 31, 2020
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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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