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Debt - 1.75% Convertible Senior Notes ("2023 Notes) (Narrative) (Details)
9 Months Ended 12 Months Ended
May 29, 2018
USD ($)
day
$ / shares
Mar. 30, 2019
Jun. 29, 2019
USD ($)
$ / shares
Jun. 30, 2018
USD ($)
Jul. 01, 2017
USD ($)
Debt Instrument [Line Items]          
Proceeds from issuance of senior convertible debt     $ 0 $ 225,000,000.0 $ 460,000,000.0
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  
Unamortized debt issuance cost     $ 6,400,000 $ 7,700,000  
Convertible Debt | 2023 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        
Effective rate 5.30%        
Swap rate term 5 years        
Initial conversion price (usd per share) | $ / shares $ 13.94   $ 13.94    
Premium to closing sale price of common stock (percent) 37.50%        
Threshold closing price as a percentage of conversion price 130.00%        
Threshold trading days (days) | day 20        
Threshold consecutive trading days (days) | day 30        
Threshold consecutive business days (days) | day 5        
Threshold consecutive trading days during which the the trading price was less than 98% of the product of the closing sale price and the applicable conversion rate (days) | day 10        
Threshold percentage of stock price trigger 98.00%        
Fundamental change in price (percent) 100.00%        
Redemption price (percent) 100.00%        
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      
Issuance costs 2,200,000        
Unamortized debt issuance cost     $ 1,500,000    
Fair value of Notes     $ 261,300,000 $ 232,400,000  
Convertible Debt | Liability component          
Debt Instrument [Line Items]          
Issuance costs 1,900,000        
Convertible Debt | Equity component          
Debt Instrument [Line Items]          
Issuance costs 300,000        
Exchange Transaction | Convertible Debt | 2023 Notes          
Debt Instrument [Line Items]          
Proceeds from issuance of senior convertible debt 155,500,000     $ 155,500,000  
Private Placement | Convertible Debt | 2023 Notes          
Debt Instrument [Line Items]          
Proceeds from issuance of senior convertible debt 69,500,000        
Proceeds from issuance of senior convertible debt, after issuance costs $ 67,300,000