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Convertible Senior Notes - Narrative (Details)
$ / shares in Units, shares in Millions
1 Months Ended 9 Months Ended
Jun. 01, 2018
USD ($)
Sep. 30, 2018
USD ($)
d
Sep. 29, 2018
USD ($)
$ / shares
shares
Sep. 30, 2017
USD ($)
Sep. 26, 2015
USD ($)
Jun. 30, 2018
Jun. 29, 2018
$ / shares
May 31, 2018
Dec. 30, 2017
USD ($)
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Proceeds from issuance of debt, net     $ 391,431,000   $ 0        
Payment of capped call     $ 48,880,000 $ 0          
Closing price of common stock (in usd per share) | $ / shares             $ 7.30    
2.125% Convertible Senior Notes Due September 1, 2024                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Proceeds from issuance of debt, net   $ 391,400,000              
Payment of capped call   $ 48,900,000              
Strike price (in dollars per share) | $ / shares     $ 9.87            
Cap price (in dollars per share) | $ / shares     $ 15.19            
Number of shares covered by capped transactions (in shares) | shares     40.8            
Conversion ratio   101.2812              
Debt instrument, convertible, if-converted value in excess of principal   $ 1,000              
Conversion price (in dollars per share) | $ / shares     $ 9.87            
Purchase price as a percentage on principal amount of the notes upon the occurrence of a fundamental change   100.00%              
Net equity component carrying amount     $ 128,700,000            
Deferred tax liability     $ 30,900,000            
Additional effective rate of interest to be used on amortized carrying value     10.07%            
Fair value of convertible debt     $ 403,500,000            
Debt instrument interest percentage     2.125%            
2.125% Convertible Senior Notes, Circumstance 1                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Threshold trading days | d   20              
Threshold consecutive trading days | d   30              
Convertible threshold minimum percentage   130.00%              
2.125% Convertible Senior Notes, Circumstance 2                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Debt instrument, convertible, if-converted value in excess of principal   $ 1,000              
Threshold trading days | d   5              
Threshold consecutive trading days | d   5              
Convertible, threshold maximum percentage   98.00%              
1.75% Convertible Senior Notes Due June 1, 2018                  
Accounts, Notes, Loans and Financing Receivable [Line Items]                  
Repayment of debt $ 150,000,000                
Net equity component carrying amount                 $ 43,300,000
Additional effective rate of interest to be used on amortized carrying value       10.23%   10.23%      
Repayment of final coupon interest $ 1,300,000                
Debt instrument interest percentage     1.75% 1.75%       1.75%