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Debt and Credit Arrangements - Effect on Financial Statements (Details) - USD ($)
12 Months Ended
Dec. 27, 2015
Dec. 28, 2014
Dec. 29, 2013
Debt and Credit Arrangements      
Weighted average interest rate for Credit Facility borrowings, including the impact of interest rate swaps 2.00% 1.70% 1.40%
Interest paid $ 5,300,000 $ 3,700,000 $ 2,000,000
Interest rate swap      
Debt and Credit Arrangements      
Amount of Gain or (Loss) Recognized in AOCI on Derivative (Effective Portion) (1,163,000) (164,000) (32,000)
Interest rate swap liabilities 2,300,000    
Interest expense | Interest rate swap      
Debt and Credit Arrangements      
Amount of Gain or (Loss) Reclassified from AOCI into Income (Effective Portion) (1,563,000) (996,000) (501,000)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion and Amount Excluded from Effectiveness Testing) 0 $ 0 $ 0
Portion of derivative liability that would be reclassified into earnings $ 470,000    
Estimate of period of time over which portion of derivative liability would be reclassified into earnings 12 months