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CONVERTIBLE SENIOR NOTES - Additional Information (Details) $ / shares in Units, shares in Millions | 1 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2018 USD ($) day $ / shares shares | Jan. 31, 2020 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 | $ 143,200,000 |
Exercise price of warrants (in dollars per share) | $ / shares | $ 73.46 |
Proceeds from issuance of warrants | $ 88,000,000.0 |
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 |  | $ 32.47
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 |  | 35 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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