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Long-Term Debt (Narrative) (Details) - USD ($)
3 Months Ended 9 Months Ended
Mar. 10, 2015
Sep. 29, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 29, 2018
Dec. 30, 2017
Debt Instrument [Line Items]            
Principal amount   $ 278,908,000     $ 278,908,000  
Line of Credit | Term Loan            
Debt Instrument [Line Items]            
Principal amount $ 350,000,000 278,908,000     278,908,000 $ 306,791,000
Proceeds from debt 346,500,000          
Debt instrument, unamortized discount 3,500,000 $ 3,769,000     $ 3,769,000 $ 5,616,000
Payment of debt issuance cost $ 8,300,000          
Debt instrument, interest rate, effective percentage   7.03%     7.03%  
Debt instrument, periodic payment   $ 900,000 $ 900,000 $ 900,000 $ 900,000  
Required annual excess cash flow payment     200,000      
Debt instrument, payment, percentage         75.00%  
Debt principal payment   $ 15,000,000 $ 10,000,000      
Line of Credit | Term Loan | London Interbank Offered Rate (LIBOR)            
Debt Instrument [Line Items]            
Debt instrument, variable interest floor rate         1.00%  
Debt instrument, basis spread on variable rate         4.25%  
Minimum | Line of Credit | Term Loan            
Debt Instrument [Line Items]            
Debt instrument, payment, percentage         0.00%  
Maximum | Line of Credit | Term Loan            
Debt Instrument [Line Items]            
Debt instrument, payment, percentage         75.00%