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Long-Term Obligations - Second Amended and Restated Credit Agreement (Details) - Line of Credit - Revolving Credit Facility - Fifth Third Bank - USD ($)
6 Months Ended
Dec. 30, 2014
Jun. 30, 2018
Line of Credit Facility [Line Items]    
Weighted average interest rate (as percent)   4.90%
Prime Rate | United States of America, Dollars    
Line of Credit Facility [Line Items]    
Variable rate description U.S. dollar prime rate  
London Interbank Offered Rate (LIBOR) | United States of America, Dollars    
Line of Credit Facility [Line Items]    
Variable rate description LIBOR  
Canadian prime rate | Canada, Dollars    
Line of Credit Facility [Line Items]    
Variable rate description Canadian dollar prime rate  
Canadian Dealer Offered Rate (CDOR) | Canada, Dollars    
Line of Credit Facility [Line Items]    
Variable rate description Canadian Dealer Offered Rate  
Second Amended and Restated Credit Agreement    
Line of Credit Facility [Line Items]    
Maximum lender commitment $ 700,000,000.00  
Maximum amount under accordion feature $ 800,000,000.0  
Commitment fee (as percent)   0.50%
Principal amount of Holdings Note   $ 102,000,000
Outstanding borrowings   493,900,000
Letters of credit outstanding   0
Unused credit commitment   $ 206,100,000