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CONVERTIBLE SENIOR NOTES - Additional Information (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 9 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) day | Apr. 30, 2019 USD ($) $ / shares shares | Apr. 30, 2018 USD ($) $ / shares shares
Debt Instrument [Line Items] |  |  |
Number of securities called by warrants or rights (in shares) | shares |  |  | 11.8
Payments for convertible note hedges |  | $ 0 | $ 143,175,000
Exercise price of warrants (in dollars per share) | $ / shares |  |  | $ 73.46
Proceeds from issuance of warrants |  | 0 | $ 87,975,000
Transaction cost |  | $ (55,200,000) |
Dilutive effect of convertible securities (in shares) | shares |  | 3.9 |
Share price threshold for dilutive effect of convertible debt (in dollars per share) | $ / shares |  | $ 73.46 |
Dilutive effect of $10 increase in share price (in shares) | shares |  | 4.9 |
Dilutive effect of warrants (in shares) | shares |  | 1.4 |
Share price threshold for dilutive effect of warrants (in dollars per share) | $ / shares |  | $ 83.46 |
Common Class A |  |  |
Debt Instrument [Line Items] |  |  |
Share price (in dollars per share) | $ / shares |  | $ 43.19 |
Convertible Debt |  |  |
Debt Instrument [Line Items] |  |  |
Interest rate, stated percentage |  |  | 0.00%
Face amount |  |  | $ 575,000,000.0
Convertible debt |  |  | $ 75,000,000.0
Conversion ratio | 20.4705 |  |
Conversion price (in dollars per share) | $ / shares |  |  | $ 48.85
Threshold trading days | day | 20 |  |
Threshold consecutive trading days | day | 30 |  |
Threshold percentage of stock price trigger | 130.00% |  |
Redemption price, percentage | 100.00% |  |
Carrying amount of liability component |  |  | $ 423,400,000
Carrying amount of equity component |  |  | 151,600,000
Unamortized discount and debt issuance costs, net |  |  | 11,500,000
Unamortized discount, net |  |  | 10,781,000
Debt issuance cost, gross, noncurrent |  |  | 707,000
Transaction costs attributable to liability component |  |  | 8,500,000
Transaction costs attributable to equity component |  | $ 3,000,000.0 | $ 3,000,000.0
Debt instrument, term |  | 44 months |
Payments for convertible note hedges | $ 143,175,000 |  |
Proceeds from issuance of warrants | $ 87,975,000 |  |
Convertible Debt | Common Class A |  |  |
Debt Instrument [Line Items] |  |  |
Threshold percentage of stock price trigger | 98.00% |  |

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