Pension, Postretirement and Postemployment Benefits, End of Fair Value Measurement (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2015	Dec. 28, 2014	Dec. 29, 2013
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Fair value measurements, level 3 activity, purchases	$ 7,600	$ 0
International Plans [Member]
Expected benefit payments under defined benefit pension plans and postretirement benefit plan for next five years [Abstract]
2015	1,647
2016	1,792
2017	1,974
2018	2,122
2019	2,251
2020-2024	14,493
Projected benefit obligation	112,799	147,528
Fair value of plan assets	85,752	$ 102,375
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]
Fair value measurements, level 3 activity, purchases	200
Fair value measurement, level 3 activity, capital distributions	59,800
Fair value measurement, level 3 activity, unrealized gain on plan assets still held	740
Fair Value Measurement With Unobservable Inputs Reconciliation Asset Gain Loss On Assets Sold	$ 3,600
Shared long-term total return goal on plan assets	7.00%	7.00%	7.00%
Components of net periodic cost [Abstract]
Service cost	$ 1,918	$ 1,824	$ 2,579
Interest cost	15,683	16,209	15,597
Expected return on assets	(18,538)	(18,631)	(17,761)
Amortization of prior service cost	65	98	98
Amortization of actuarial loss	7,468	3,351	7,070
Curtailment/settlement losses	781	0	6,993
Net periodic benefit cost	$ 7,377	$ 2,851	$ 14,576
Assumptions used to determine net periodic benefit cost of pension plan and postretirement plan [Abstract]
Weighted average discount rate	4.22%	5.02%	4.49%
Long-term rate of return on plan assets	7.00%	7.00%	7.00%
Expected benefit payments under defined benefit pension plans and postretirement benefit plan for next five years [Abstract]
2015	$ 19,501
2016	20,036
2017	20,576
2018	20,955
2019	21,249
2020-2024	115,117
Postretirement [Member]
Components of net periodic cost [Abstract]
Service cost	567	$ 543	$ 750
Interest cost	1,154	1,337	1,380
Amortization of actuarial loss	(304)	(457)	(264)
Curtailment/settlement losses	(3,842)	0	0
Net periodic benefit cost	$ (2,425)	$ 1,423	$ 1,866
Assumptions used to determine net periodic benefit cost of pension plan and postretirement plan [Abstract]
Weighted average discount rate	4.49%	5.11%	4.34%
Health care cost trend rate assumed for next year	6.50%	7.00%	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	2020	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]
2015	$ 1,850
2016	1,657
2017	1,615
2018	1,552
2019	1,504
2020-2024	$ 6,934