Fair Value - Fair Value of Assets and Liabilities (Details) - USD ($) $ in Thousands	Sep. 24, 2016	Dec. 26, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash equivalents	$ 14	$ 190
Other current assets:
Mutual funds		4,509
Foreign currency forward contracts		15
Other assets:
Life insurance policies	21,521	20,364
Total assets measured at fair value	21,535	25,078
Other current liabilities:
Contingent consideration	4,126	1,172
Other long-term liabilities:
Contingent consideration		198
Redeemable noncontrolling interest		28,008
Total liabilities and redeemable noncontrolling interest measured at fair value	4,126	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		4,509
Foreign currency forward contracts		0
Other assets:
Life insurance policies	0	0
Total assets measured at fair value	0	4,509
Other current liabilities:
Contingent consideration	0	0
Other long-term liabilities:
Contingent consideration		0
Redeemable noncontrolling interest		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	14	190
Other current assets:
Mutual funds		0
Foreign currency forward contracts		15
Other assets:
Life insurance policies	21,521	20,364
Total assets measured at fair value	21,535	20,569
Other current liabilities:
Contingent consideration	0	0
Other long-term liabilities:
Contingent consideration		0
Redeemable noncontrolling interest		0
Total liabilities and redeemable noncontrolling interest measured at fair value	0	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
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	4,126	1,172
Other long-term liabilities:
Contingent consideration		198
Redeemable noncontrolling interest		28,008
Total liabilities and redeemable noncontrolling interest measured at fair value	$ 4,126	$ 29,378