Pension, Postretirement and Postemployment Benefits (Details) $ in Thousands	12 Months Ended
	Dec. 25, 2016 USD ($)	Dec. 27, 2015 USD ($)	Dec. 28, 2014 USD ($)	Dec. 25, 2016 USD ($)	Dec. 27, 2015 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	$ 45,200	$ 36,000	$ 34,300
Pension expense related to defined contribution plans	33,300	26,600	28,100
Defined benefit plan, number of major plans which principally cover non-union employees				2
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Defined benefit plan, number of major plans that are funded				1
Pension [Member]
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Weighted average discount rate				4.22%	4.58%
Change in Projected Benefit Obligation [Roll Forward]
Service cost	2,100	1,918	1,824
Interest cost	16,106	15,683	16,209
Reconciliation of Funded Status [Abstract]
Expected amortization of unrecognized net losses in next fiscal year	9,082
Pension [Member] | International Plans[Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	1,533	2,769	3,363
Reconciliation of Funded Status [Abstract]
Expected amortization of unrecognized net losses in next fiscal year	1,281
Expected amortization of unrecognized prior service cost in next fiscal year	(36)
Pension [Member] | United States [Member]
Change in Projected Benefit Obligation [Roll Forward]
Projected benefit obligation - beginning	361,060	383,068
Service cost	2,100	1,918
Interest cost	16,106	15,683
Actuarial (gain) loss	17,353	(17,968)
Curtailment	0	660
Benefits paid	22,508	20,202
Expenses paid	1,287	2,099
Projected benefit obligation - ending	372,824	361,060	383,068
Accumulated benefit obligation - ending				$ 372,824	$ 361,060
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	259,329	272,010
Actual return on plan assets	8,961	(3,414)
Employer contribution	64,885	13,034
Benefits paid	(22,508)	(20,202)
Expenses paid	(1,287)	(2,099)
Fair value of plan assets - ending	309,380	259,329	272,010
Reconciliation of Funded Status [Abstract]
Projected benefit obligation	(372,824)	(383,068)	(383,068)	(372,824)	(361,060)
Fair value of plan assets	$ 259,329	$ 259,329	272,010	309,380	259,329
Funded status				(63,444)	(101,731)
Unrecognized net loss (gain)				138,529	120,482
Unrecognized prior service cost				0	0
Net amount recognized				75,085	18,751
Accrued liabilities				(2,553)	(2,663)
Other liabilities				(60,891)	(99,068)
Accumulated other comprehensive earnings (loss)				138,529	120,482
Pension [Member] | United States [Member] | Funded [Member]
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Projected benefit obligations in excess of the fair value of the plans' assets				28,340	66,980
Pension [Member] | United States [Member] | Unfunded [Member]
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Projected benefit obligations in excess of the fair value of the plans' assets				$ 35,104	$ 34,751
Postretirement [Member]
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Weighted average discount rate				4.26%	4.64%
Health care cost trend rate assumed for next year	7.00%	7.00%
Rate to which the cost trend rate is assumed to decline (ultimate trend rate)	5.00%	5.00%
Year that the rate reaches the ultimate trend	2021	2021
Change in Projected Benefit Obligation [Roll Forward]
Service cost	$ 532	$ 567	543
Interest cost	1,175	1,154	1,337
Postretirement [Member] | United States [Member]
Change in Projected Benefit Obligation [Roll Forward]
Projected benefit obligation - beginning	26,247	28,017
Service cost	532	567
Interest cost	1,175	1,154
Actuarial (gain) loss	2,380	(741)
Curtailment	0	(746)
Benefits paid	1,850	2,004
Expenses paid	0	0
Projected benefit obligation - ending	28,484	26,247	28,017
Accumulated benefit obligation - ending				$ 28,484	$ 26,247
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	0	0
Actual return on plan assets	0	0
Employer contribution	0	0
Benefits paid	0	0
Expenses paid	0	0
Fair value of plan assets - ending	0	0	0
Reconciliation of Funded Status [Abstract]
Projected benefit obligation	(26,247)	(26,247)	(28,017)	(28,484)	(26,247)
Fair value of plan assets	$ 0	$ 0	$ 0	0	0
Funded status				(28,484)	(26,247)
Unrecognized net loss (gain)				2,420	41
Unrecognized prior service cost				0	0
Net amount recognized				(26,064)	(26,206)
Accrued liabilities				(1,599)	(1,800)
Other liabilities				(26,885)	(24,447)
Accumulated other comprehensive earnings (loss)				$ 2,420	$ 41