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CONVERTIBLE SENIOR NOTES - Components of Notes (Details) - USD ($) $ in Thousands | Oct. 31, 2020 | Jul. 31, 2020 | Jan. 31, 2018
--- | --- | --- | ---
2023 Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Net carrying amount | $ 498,378 | $ 490,222 |
Convertible Debt | 2023 Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 575,000 | 575,000 | $ 575,000
Unamortized discount | (72,573) | (80,298) |
Unamortized debt issuance cost | (4,049) | (4,480) |
Carrying amount of equity component | $ 148,598 | $ 148,598 |
Effective interest rate | 6.62% |  |
Payments of offering costs | $ (3,000) |  | $ (3,000)
Convertible Debt | 2026 Convertible Senior Notes |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 750,000 |  |
Unamortized discount | (227,723) |  |
Unamortized debt issuance cost | (26,018) |  |
Net carrying amount | $ 496,259 |  |
Effective interest rate | 705.00% |  |

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