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Debt (2019 Notes) (Details) - USD ($)
$ in Thousands
4 Months Ended 12 Months Ended
Nov. 30, 2016
Dec. 30, 2016
Dec. 29, 2017
Jul. 31, 2016
Jan. 01, 2016
Debt Instrument [Line Items]          
Aggregate principal amount of debt converted   $ 189,122 $ 0    
Issuance of common stock in settlement of convertible notes   253,080      
Senior subordinated notes [Member] | 2019 Notes [Member]          
Debt Instrument [Line Items]          
Aggregate principal amount of debt converted       $ 287,500  
Number of shares issued pursuant to conversion (in shares) 54,009,279        
Redemption of convertible debt $ 600        
Inducements in conversion 6,000        
Cash inducements 2,400 2,394      
Repayments of interest required upon a conversion under the terms of the indenture that were not repaid under the terms of the exchange agreements 3,600 $ 3,572      
Issuance of common stock in settlement of convertible notes 592,700        
Reduction of additional paid-in capital resulting from conversion $ 342,700        
Stated interest rate         4.25%