Annual report pursuant to Section 13 and 15(d)

Debt - Term Loan Facility (Details)

v3.10.0.1
Debt - Term Loan Facility (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 27, 2018
Dec. 28, 2017
Sep. 30, 2016
Debt Instrument [Line Items]      
Total debt at par value $ 149,000 $ 193,500  
Term Loan Facility      
Debt Instrument [Line Items]      
Total debt at par value 149,000 $ 152,500 $ 350,000
Quarterly repayment amount $ 875    
Term Loan Facility | Base Rate [Member]      
Debt Instrument [Line Items]      
Variable interest rate (as a percent) 1.50%    
Term Loan Facility | London Interbank Offered Rate (LIBOR) [Member]      
Debt Instrument [Line Items]      
Variable interest rate (as a percent) 2.50%    
Term Loan Facility | One Month LIBOR      
Debt Instrument [Line Items]      
Variable interest rate (as a percent) 1.00%    
Term Loan Facility | Federal Funds Rate [Member]      
Debt Instrument [Line Items]      
Variable interest rate (as a percent) 0.50%