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Debt - 2.125% Convertible Senior Notes (Details)
$ / shares in Units, $ in Thousands, shares in Millions
1 Months Ended
Mar. 28, 2020
USD ($)
$ / shares
shares
Sep. 30, 2018
USD ($)
d
Mar. 27, 2020
$ / shares
Dec. 28, 2019
USD ($)
Sep. 27, 2019
$ / shares
Debt Instrument [Line Items]          
Deferred tax liability $ 7,505     $ 8,700  
Closing price of common stock (in usd per share) | $ / shares     $ 5.14   $ 5.14
2.125% Convertible Senior Notes          
Debt Instrument [Line Items]          
Debt instrument interest percentage 2.125%        
Proceeds from issuance of debt, net   $ 391,400      
Payment of capped call   $ 48,900      
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   0.1012812      
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%      
Convertible debt, remaining discount amortization period 54 months        
Carrying amount of equity component $ 128,700        
Deferred tax liability $ 30,900        
Additional effective rate of interest to be used on amortized carrying value 9.92%        
Fair value of convertible debt $ 334,100        
2.125% Convertible Senior Notes, Circumstance 1          
Debt Instrument [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          
Debt Instrument [Line Items]          
Threshold trading days | d   5      
Threshold consecutive trading days | d   5      
Convertible, threshold maximum percentage   98.00%