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CONVERTIBLE SENIOR NOTES - Components of Notes (Details) - USD ($) $ in Thousands | Apr. 30, 2019 | Jul. 31, 2018 | Apr. 30, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Convertible senior notes, net | $ 451,399 | $ 429,598 |
Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Principal amount | 575,000 | 575,000 | $ 575,000
Unamortized discount | (117,070) | (137,719) |
Unamortized debt issuance cost | (6,531) | (7,683) |
Carrying amount of the equity component | $ 148,598 | $ 148,598 |
Effective interest rate | 6.62% |  |
Payments of offering costs | $ (3,000) |  | $ (3,000)

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