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Debt - 0.625% Senior Convertible Notes (“2033 Notes”) (Narrative) (Details)
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 10, 2018
USD ($)
shares
Aug. 15, 2018
USD ($)
May 29, 2018
USD ($)
day
$ / shares
Aug. 21, 2013
USD ($)
day
$ / shares
Jun. 27, 2015
noteholder
Mar. 30, 2019
Jun. 29, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Sep. 05, 2018
USD ($)
Aug. 17, 2015
$ / shares
Aug. 15, 2013
Debt Instrument [Line Items]                        
Proceeds from issuance of senior convertible debt             $ 0 $ 225,000,000.0 $ 460,000,000.0      
Loss on extinguishment of debt             0 5,000,000.0 1,100,000      
Repayments of debt             276,900,000 353,300,000 $ 45,400,000      
Convertible Debt                        
Debt Instrument [Line Items]                        
Carrying value of liability component             578,800,000 833,200,000        
Carrying value of the equity component of convertible debt             $ 136,800,000 $ 239,100,000        
Convertible Debt | 1.75% Senior Convertible Notes                        
Debt Instrument [Line Items]                        
Interest rate on senior convertible notes     1.75%       1.75% 1.75%        
Face amount of senior convertible notes     $ 225,000,000.0                  
Initial conversion price (usd per share) | $ / shares     $ 13.94       $ 13.94          
Premium to closing sale price of common stock (percent)     37.50%                  
Threshold percentage of stock price trigger     98.00%                  
Threshold trading days (days) | day     20                  
Threshold consecutive trading days (days) | day     30                  
Fundamental change in price (percent)     100.00%                  
Redemption price (percent)     100.00%                  
Effective rate     5.30%                  
Carrying value of liability component     $ 190,100,000                  
Carrying value of the equity component of convertible debt     34,900,000                  
Expected remaining term of Notes           3 years 10 months 24 days            
Outstanding amount of debt             $ 225,000,000.0 $ 225,000,000.0        
Fair value of Notes             $ 261,300,000 $ 232,400,000        
Convertible Debt | 0.625% Senior Convertible Notes                        
Debt Instrument [Line Items]                        
Interest rate on senior convertible notes       0.625%     0.625% 0.625%        
Face amount of senior convertible notes       $ 650,000,000.0                
Proceeds from issuance of senior convertible debt, after issuance costs       $ 636,300,000                
Initial conversion price (usd per share) | $ / shares       $ 18.83     $ 11.28       $ 11.28  
Premium to closing sale price of common stock (percent)                       40.00%
Threshold consecutive trading days (days) | day       30                
Threshold consecutive business days (days) | day       5                
Convertible period of consecutive trading days (days)       10 days                
Number of holders | noteholder         0              
Fundamental change in price (percent)       100.00%                
Redemption price (percent)       100.00%                
Discount rate       5.40%                
Discount period       5 years                
Effective rate       5.40%                
Carrying value of liability component       $ 515,600,000                
Carrying value of the equity component of convertible debt       134,400,000                
Expected remaining term of Notes               1 month 6 days        
Issuance costs       13,700,000                
Liability component of issuance costs       10,900,000                
Equity component of issuance costs       $ 2,800,000                
Repurchased aggregate principal amount               $ 181,500,000   $ 142,700,000    
Value of notes exchanged               198,000,000.0        
Loss on extinguishment of debt               5,000,000.0        
Repayments of debt   $ 134,300,000                    
Outstanding amount of debt             $ 0 277,000,000.0        
Fair value of Notes             $ 281,000,000.0          
Convertible Debt | 0.625% Senior Convertible Notes | Minimum                        
Debt Instrument [Line Items]                        
Threshold percentage of stock price trigger       130.00%                
Threshold trading days (days) | day       20                
Convertible Debt | 0.625% Senior Convertible Notes | Maximum                        
Debt Instrument [Line Items]                        
Threshold price as a percentage of closing price of common stock       98.00%                
Convertible Debt | 2033 Notes Redeemed By Holders                        
Debt Instrument [Line Items]                        
Repurchased aggregate principal amount $ 112,000,000.0                      
Repayments of debt $ 111,800,000                      
Shares issued in debt conversion (in shares) | shares 231,795                      
Convertible Debt | 2033 Notes Redeemed By The Company                        
Debt Instrument [Line Items]                        
Repurchased aggregate principal amount $ 30,700,000                      
Repayments of debt $ 30,800,000                      
Exchange Transaction | Convertible Debt | 1.75% Senior Convertible Notes                        
Debt Instrument [Line Items]                        
Proceeds from issuance of senior convertible debt     155,500,000         155,500,000        
Exchange Transaction | Convertible Debt | 0.625% Senior Convertible Notes                        
Debt Instrument [Line Items]                        
Value of notes exchanged     $ 151,500,000         $ 151,500,000