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Debt - Derivatives (Details)
3 Months Ended 9 Months Ended
Sep. 24, 2017
USD ($)
derivative
Sep. 25, 2016
USD ($)
Sep. 24, 2017
USD ($)
derivative
Sep. 25, 2016
USD ($)
Oct. 31, 2017
USD ($)
Interest rate swaps          
Weighted average interest rates on debt, including impact of interest rate swaps 2.70% 2.10% 2.40% 2.10%  
Interest paid $ 2,000,000 $ 1,900,000 $ 5,900,000 $ 5,300,000  
Interest rate swap          
Interest rate swaps          
Interest rate swap liabilities $ 2,500,000   2,500,000    
Interest rate swap | Interest expense          
Interest rate swaps          
Portion of derivative liability that would be reclassified into earnings     $ 210,000    
Estimate of period of time over which portion of derivative liability would be reclassified into earnings     12 months    
Interest rate swaps executed before 2015          
Interest rate swaps          
Number of derivatives held | derivative 2   2    
Interest rate swap agreement, notional amount $ 125,000,000   $ 125,000,000    
Interest rate swaps executed in 2015          
Interest rate swaps          
Number of derivatives held | derivative 3   3    
Interest rate swaps executed in October 2017 | Subsequent event          
Interest rate swaps          
Interest rate swap agreement, notional amount         $ 275,000,000
Interest rate swap, July 2013, 1.42% fixed          
Interest rate swaps          
Interest rate swap agreement, notional amount $ 75,000,000   $ 75,000,000    
Interest rate swap agreement, fixed interest rate 1.42%   1.42%    
Interest rate swap, December 2014, 1.36% fixed          
Interest rate swaps          
Interest rate swap agreement, notional amount $ 50,000,000   $ 50,000,000    
Interest rate swap agreement, fixed interest rate 1.36%   1.36%    
Interest rate swap, April 2018, 2.33% fixed          
Interest rate swaps          
Interest rate swap agreement, notional amount $ 55,000,000   $ 55,000,000    
Interest rate swap agreement, fixed interest rate 2.33%   2.33%    
Interest rate swap, April 2018, 2.36% fixed          
Interest rate swaps          
Interest rate swap agreement, notional amount $ 35,000,000   $ 35,000,000    
Interest rate swap agreement, fixed interest rate 2.36%   2.36%    
Interest rate swap, April 2018, 2.34% fixed          
Interest rate swaps          
Interest rate swap agreement, notional amount $ 35,000,000   $ 35,000,000    
Interest rate swap agreement, fixed interest rate 2.34%   2.34%    
Interest rate swap, January 2018, 1.99% fixed, $100 million notional amount | Subsequent event          
Interest rate swaps          
Interest rate swap agreement, notional amount         $ 100,000,000
Interest rate swap agreement, fixed interest rate         1.99%
Interest rate swap, January 2018, 1.99% fixed, $75 million notional amount | Subsequent event          
Interest rate swaps          
Interest rate swap agreement, notional amount         $ 75,000,000
Interest rate swap agreement, fixed interest rate         1.99%
Interest rate swap, January 2018, 2.00% fixed, $75 million notional amount | Subsequent event          
Interest rate swaps          
Interest rate swap agreement, notional amount         $ 75,000,000
Interest rate swap agreement, fixed interest rate         2.00%
Interest rate swap, January 2018, 1.99% fixed, $25 million notional amount | Subsequent event          
Interest rate swaps          
Interest rate swap agreement, notional amount         $ 25,000,000
Interest rate swap agreement, fixed interest rate         1.99%