XML 42 R43.htm IDEA: XBRL DOCUMENT v3.20.1
CONVERTIBLE SENIOR NOTES - Additional Information (Details)
$ / shares in Units, shares in Millions
1 Months Ended 9 Months Ended
Jan. 31, 2018
USD ($)
day
$ / shares
shares
Apr. 30, 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   $ 20.49
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   32 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%