Pension, Postretirement and Postemployment Benefits (Details) $ in Thousands	12 Months Ended
	Dec. 27, 2015 USD ($)	Dec. 28, 2014 USD ($)	Dec. 29, 2013 USD ($)	Dec. 27, 2015 USD ($) Plan	Dec. 28, 2014 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	$ 36,000	$ 34,300	$ 35,900
Pension expense related to defined contribution plans	26,600	28,100	23,000
Defined benefit plan, number of major plans which principally cover non-union employees | Plan				2
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Defined benefit plan, number of major plans that are funded | Plan				1
Pension [Member]
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Weighted average discount rate				4.58%	4.19%
Change in Projected Benefit Obligation [Roll Forward]
Service cost	1,918	1,824	2,579
Interest cost	15,683	16,209	15,597
Reconciliation of Funded Status [Abstract]
Expected amortization of unrecognized net losses in next fiscal year	7,361
Pension [Member] | International Plans[Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Pension expense	2,769	3,363	4,085
Reconciliation of Funded Status [Abstract]
Expected amortization of unrecognized net losses in next fiscal year	1,077
Expected amortization of unrecognized prior service cost in next fiscal year	(39)
Pension [Member] | United States [Member]
Change in Projected Benefit Obligation [Roll Forward]
Projected benefit obligation - beginning	383,068	332,774
Service cost	1,918	1,824
Interest cost	15,683	16,209
Actuarial (gain) loss	(17,968)	59,640
Curtailment	660	0
Plan amendment	0	0
Benefits paid	(20,202)	(25,690)
Settlements	0	0
Expenses paid	(2,099)	(1,689)
Projected benefit obligation - ending	361,060	383,068	332,774
Accumulated benefit obligation - ending				$ 361,060	$ 383,068
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	272,010	273,337
Actual return on plan assets	(3,414)	20,385
Employer contribution	13,034	5,667
Benefits paid	(20,202)	(25,690)
Settlements	0	0
Expenses paid	(2,099)	(1,689)
Fair value of plan assets - ending	259,329	272,010	273,337
Reconciliation of Funded Status [Abstract]
Projected benefit obligation	(383,068)	(332,774)	(332,774)	(361,060)	(383,068)
Fair value of plan assets	$ 272,010	$ 272,010	273,337	259,329	272,010
Funded status				(101,731)	(111,058)
Unrecognized net loss (gain)				120,482	123,968
Unrecognized prior service cost				0	187
Net amount recognized				18,751	13,097
Accrued liabilities				(2,663)	(2,990)
Other liabilities				(99,068)	(108,068)
Accumulated other comprehensive earnings (loss)				120,482	124,155
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				66,980	73,398
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				$ 34,751	$ 37,660
Postretirement [Member]
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract]
Weighted average discount rate				4.64%	4.23%
Health care cost trend rate assumed for next year	7.00%	6.50%
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	2020
Change in Projected Benefit Obligation [Roll Forward]
Service cost	$ 567	$ 543	750
Interest cost	1,154	1,337	1,380
Reconciliation of Funded Status [Abstract]
Expected amortization of unrecognized prior service cost in next fiscal year	0
Postretirement [Member] | United States [Member]
Change in Projected Benefit Obligation [Roll Forward]
Projected benefit obligation - beginning	28,017	27,174
Service cost	567	543
Interest cost	1,154	1,337
Actuarial (gain) loss	(741)	796
Curtailment	(746)	0
Plan amendment	0	0
Benefits paid	(2,004)	(1,833)
Settlements	0	0
Expenses paid	0	0
Projected benefit obligation - ending	26,247	28,017	27,174
Accumulated benefit obligation - ending				$ 26,247	$ 28,017
Change in Plan Assets [Roll Forward]
Fair value of plan assets - beginning	0
Actual return on plan assets	0	0
Employer contribution	0	0
Benefits paid	0	0
Settlements	0	0
Expenses paid	0	0
Fair value of plan assets - ending	0	0
Reconciliation of Funded Status [Abstract]
Projected benefit obligation	(28,017)	(27,174)	$ (27,174)	(26,247)	(28,017)
Fair value of plan assets	$ 0	$ 0		0	0
Funded status				(26,247)	(28,017)
Unrecognized net loss (gain)				41	782
Unrecognized prior service cost				0	(3,401)
Net amount recognized				(26,206)	(30,636)
Accrued liabilities				(1,800)	(2,100)
Other liabilities				(24,447)	(25,917)
Accumulated other comprehensive earnings (loss)				$ 41	$ (2,619)