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Convertible Senior Notes - Narrative (Details) - Convertible Debt - Convertible Senior Notes Due 2024
1 Months Ended 3 Months Ended
Mar. 31, 2017
USD ($)
d
$ / shares
Sep. 29, 2018
USD ($)
Jun. 30, 2018
USD ($)
Sep. 30, 2017
Mar. 08, 2017
USD ($)
Debt Instrument [Line Items]          
Debt, stated interest rate 0.25% 0.25%      
Conversion rate 0.0164965        
Conversion price (usd per share) | $ / shares $ 60.62        
Conversion price premium percentage 132.50%        
Conversion threshold trading days | d 20        
Conversion threshold consecutive trading days | d 30        
Conversion threshold percentage of stock price trigger 130.00%        
Sale price of common stock (usd per share) | $ / shares $ 78.80        
Conversion threshold measurement period 5 days        
Conversion threshold percentage of conversion rate from measurement period 98.00%        
Percentage of principal amount required to be paid upon contingent note repurchase   100.00%      
Derivative liability fair value         $ 129,900,000
Residual principal amount of notes before issuance costs $ 320,100,000        
Debt issuance costs $ 7,700,000        
Effective interest rate on the liability component 5.40% 5.40%   5.40%  
Debt, remaining discount amortization period   65 months      
Debt, aggregate principal amount $ 450,000,000 $ 450,000,000 $ 450,000,000