Pension, Postretirement and Postemployment Benefits, End of Fair Value Measurement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 25, 2016	Dec. 27, 2015	Dec. 28, 2014
International Plans [Member]
Expected benefit payments under defined benefit pension plans and postretirement benefit plan for next five years [Abstract]
2017	$ 1,689
2018	1,910
2019	2,051
2020	2,219
2021	2,453
2022-2026	15,963
Projected benefit obligation	118,492	$ 112,799
Fair value of plan assets	85,678	$ 85,752
Expected amortization of unrecognized transition obligation in next fiscal year	$ 2
Pension [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Shared long-term total return goal on plan assets	6.75%	7.00%	7.00%
Components of net periodic cost [Abstract]
Service cost	$ 2,100	$ 1,918	$ 1,824
Interest cost	16,106	15,683	16,209
Expected return on assets	(17,013)	(18,538)	(18,631)
Amortization of prior service cost	0	65	98
Amortization of actuarial loss	7,361	7,468	3,351
Curtailment/settlement losses	0	781	0
Net periodic benefit cost	$ 8,554	$ 7,377	$ 2,851
Assumptions used to determine net periodic benefit cost of pension plan and postretirement plan [Abstract]
Weighted average discount rate	4.58%	4.22%	5.02%
Long-term rate of return on plan assets	6.75%	7.00%	7.00%
Expected benefit payments under defined benefit pension plans and postretirement benefit plan for next five years [Abstract]
2017	$ 20,034
2018	20,108
2019	20,520
2020	20,995
2021	21,694
2022-2026	116,258
Postretirement [Member]
Components of net periodic cost [Abstract]
Service cost	532	$ 567	$ 543
Interest cost	1,175	1,154	1,337
Amortization of actuarial loss	0	(304)	(457)
Curtailment/settlement losses	0	(3,842)	0
Net periodic benefit cost	$ 1,707	$ (2,425)	$ 1,423
Assumptions used to determine net periodic benefit cost of pension plan and postretirement plan [Abstract]
Weighted average discount rate	4.64%	4.49%	5.11%
Health care cost trend rate assumed for next year	7.00%	6.50%	7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00%	5.00%	5.00%
Year that the rate reaches the ultimate trend rate	2021	2020	2020
Effect of one percentage point increase in health care cost trend rate on accumulated postretirement benefit obligation and aggregate of benefits earned and interest cost	1.00%
Expected benefit payments under defined benefit pension plans and postretirement benefit plan for next five years [Abstract]
2017	$ 1,633
2018	1,593
2019	1,541
2020	1,497
2021	1,452
2022-2026	$ 6,829