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CONVERTIBLE SENIOR NOTES - Proceeds from Notes (Details) - USD ($) $ in Thousands | 1 Months Ended | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jan. 31, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Apr. 30, 2019 | Apr. 30, 2018 | Jul. 31, 2018
Debt Instrument [Line Items] |  |  |  |  |  |
Payments for convertible note hedges |  |  |  | $ 0 | $ (143,175) |
Proceeds from issuance of warrants |  |  |  | 0 | 87,975 |
Net proceeds |  |  |  |  | 563,937 |
Convertible Debt |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |
Principal amount |  | $ 575,000 | $ 575,000 | 575,000 | 575,000 | $ 575,000
Less: initial purchasers' discount |  |  | (10,781) |  | (10,781) |
Payments for convertible note hedges | $ (143,175) |  |  |  |  |
Proceeds from issuance of warrants | 87,975 |  |  |  |  |
Debt issuance cost, gross, noncurrent |  |  | 707 |  | 707 |
Less: other issuance costs |  | $ (390) | $ (366) | $ (1,152) | $ (404) |
Net proceeds | $ 508,312 |  |  |  |  |

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