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Fair Value - Fair Value of Assets and Liabilities (Details) - USD ($)
$ in Thousands
Mar. 26, 2016
Dec. 26, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents $ 221 $ 190
Other current assets:    
Mutual funds 4,552 4,509
Foreign currency forward contracts   15
Other assets:    
Life insurance policies 19,889 20,364
Total assets measured at fair value 24,662 25,078
Other current liabilities:    
Contingent consideration 1,114 1,172
Foreign currency forward contracts 25  
Other long-term liabilities:    
Contingent consideration 200 198
Redeemable noncontrolling interest 28,744 28,008
Total liabilities and redeemable noncontrolling interest measured at fair value 30,083 29,378
Level 1    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other current assets:    
Mutual funds 4,552 4,509
Foreign currency forward contracts   0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 4,552 4,509
Other current liabilities:    
Contingent consideration 0 0
Foreign currency forward contracts 0  
Other long-term liabilities:    
Contingent consideration 0 0
Redeemable noncontrolling interest 0 0
Total liabilities and redeemable noncontrolling interest measured at fair value 0 0
Level 2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 221 190
Other current assets:    
Mutual funds 0 0
Foreign currency forward contracts   15
Other assets:    
Life insurance policies 19,889 20,364
Total assets measured at fair value 20,110 20,569
Other current liabilities:    
Contingent consideration 0 0
Foreign currency forward contracts 25  
Other long-term liabilities:    
Contingent consideration 0 0
Redeemable noncontrolling interest 0 0
Total liabilities and redeemable noncontrolling interest measured at fair value 25 0
Level 3    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Cash equivalents 0 0
Other current assets:    
Mutual funds 0 0
Foreign currency forward contracts   0
Other assets:    
Life insurance policies 0 0
Total assets measured at fair value 0 0
Other current liabilities:    
Contingent consideration 1,114 1,172
Foreign currency forward contracts 0  
Other long-term liabilities:    
Contingent consideration 200 198
Redeemable noncontrolling interest 28,744 28,008
Total liabilities and redeemable noncontrolling interest measured at fair value $ 30,058 $ 29,378