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Pension, Postretirement and Postemployment Benefits (Details) $ in Thousands | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 25, 2016 USD ($) | Dec. 27, 2015 USD ($) | Dec. 31, 2017 USD ($) | Dec. 25, 2016 USD ($)
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Pension expense | $ 45,900 | $ 45,200 | $ 36,000 |  |
Pension expense related to defined contribution plans | 36,000 | 33,300 | 26,600 |  |
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 |
Reconciliation of Funded Status [Abstract] |  |  |  |  |
Expected amortization of unrecognized net losses in next fiscal year |  |  |  | $ 8,445 |
Pension [Member] |  |  |  |  |
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract] |  |  |  |  |
Weighted average discount rate |  |  |  | 3.71% | 4.22%
Change in Projected Benefit Obligation [Roll Forward] |  |  |  |  |
Service cost | 1,290 | 2,100 | 1,918 |  |
Interest cost | 15,303 | 16,106 | 15,683 |  |
Pension [Member] | International Plans[Member] |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |
Pension expense | 3,473 | 1,533 | 2,769 |  |
Reconciliation of Funded Status [Abstract] |  |  |  |  |
Expected amortization of unrecognized net losses in next fiscal year |  |  |  | $ 1,026 |
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 | 372,824 | 361,060 |  |  |
Service cost | 1,290 | 2,100 |  |  |
Interest cost | 15,303 | 16,106 |  |  |
Actuarial (gain) loss | 27,670 | 17,353 |  |  |
Curtailment | 0 | 0 |  |  |
Benefits paid | 22,579 | 22,508 |  |  |
Expenses paid | 1,141 | 1,287 |  |  |
Projected benefit obligation - ending | 393,367 | 372,824 | 361,060 |  |
Accumulated benefit obligation - ending |  |  |  | 393,367 | $ 372,824
Change in Plan Assets [Roll Forward] |  |  |  |  |
Fair value of plan assets - beginning | 309,380 | 259,329 |  |  |
Actual return on plan assets | 44,562 | 8,961 |  |  |
Employer contribution | 52,767 | 64,885 |  |  |
Benefits paid | (22,579) | (22,508) |  |  |
Expenses paid | (1,141) | (1,287) |  |  |
Fair value of plan assets - ending | 382,989 | 309,380 | 259,329 |  |
Reconciliation of Funded Status [Abstract] |  |  |  |  |
Projected benefit obligation | (393,367) | (361,060) | (361,060) | (393,367) | (372,824)
Fair value of plan assets | $ 309,380 | $ 309,380 | 259,329 | 382,989 | 309,380
Funded status |  |  |  | (10,378) | (63,444)
Unrecognized net loss (gain) |  |  |  | 132,088 | 138,529
Unrecognized prior service cost |  |  |  | 0 | 0
Net amount recognized |  |  |  | 121,710 | 75,085
Accrued liabilities |  |  |  | (2,448) | (2,553)
Other liabilities |  |  |  | (7,930) | (60,891)
Accumulated other comprehensive earnings (loss) |  |  |  | 132,088 | 138,529
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 |  |  |  | (25,603) | 28,340
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 |  |  |  | $ 35,981 | $ 35,104
Postretirement [Member] |  |  |  |  |
Assumptions used to determine year-end pension and postretirement benefit obligations [Abstract] |  |  |  |  |
Weighted average discount rate |  |  |  | 3.74% | 4.26%
Health care cost trend rate assumed for next year | 6.50% | 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 | 2024 | 2021 |  |  |
Change in Projected Benefit Obligation [Roll Forward] |  |  |  |  |
Service cost | $ 691 | $ 532 | 567 |  |
Interest cost | 1,179 | 1,175 | 1,154 |  |
Postretirement [Member] | United States [Member] |  |  |  |  |
Change in Projected Benefit Obligation [Roll Forward] |  |  |  |  |
Projected benefit obligation - beginning | 28,484 | 26,247 |  |  |
Service cost | 691 | 532 |  |  |
Interest cost | 1,179 | 1,175 |  |  |
Actuarial (gain) loss | 3,432 | 2,380 |  |  |
Curtailment | 0 | 0 |  |  |
Benefits paid | 1,633 | 1,850 |  |  |
Expenses paid | 0 | 0 |  |  |
Projected benefit obligation - ending | 32,153 | 28,484 | 26,247 |  |
Accumulated benefit obligation - ending |  |  |  | $ 32,153 | $ 28,484
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 | (28,484) | (28,484) | (26,247) | (32,153) | (28,484)
Fair value of plan assets | $ 0 | $ 0 | $ 0 | 0 | 0
Funded status |  |  |  | (32,153) | (28,484)
Unrecognized net loss (gain) |  |  |  | 5,853 | 2,420
Unrecognized prior service cost |  |  |  | 0 | 0
Net amount recognized |  |  |  | (26,300) | (26,064)
Accrued liabilities |  |  |  | (1,630) | (1,599)
Other liabilities |  |  |  | (30,523) | (26,885)
Accumulated other comprehensive earnings (loss) |  |  |  | $ 5,853 | $ 2,420

X
- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References No definition available. + Details
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- Definition The ultimate trend rate for health care costs. + References No definition available. + Details
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- Definition The amount of payments for benefits made for which participants are entitled under a pension plan and for settlements that relieve the employer (or the plan) of primary responsibility for a benefit obligation and eliminate significant risks related to the obligation and the assets used to effect the settlement. + References No definition available. + Details
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- Definition Number of major defined benefit plans which cover non-union employees and are funded. + References No definition available. + Details
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- Definition Amount of actuarial present value of benefits attributed to employee service rendered, excluding assumptions about future compensation level. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 10A -Subparagraph (i-k) -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669646-108580 + Details
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- Definition Amount, before tax, of accumulated other comprehensive (income) loss for cost (credit) of benefit change attributable to participants' prior service from plan amendment or plan initiation of defined benefit plan, that has not been recognized in net periodic benefit cost (credit). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=84228862&loc=SL7669686-108580 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (j) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of increase (decrease) in plan assets of defined benefit plan from actual return (loss) determined by change in fair value of plan assets adjusted for contributions, benefit payments, and other expenses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of asset (liability), recognized in statement of financial position, for defined benefit pension and other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount included in accumulated other comprehensive (income) loss for prior service cost (credit) expected to be recognized in net periodic benefit cost (credit) for fiscal year following most recent annual statement of financial position. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Fair value of assets that have been segregated and restricted to provide pension or postretirement benefits. Assets include, but are not limited to, stocks, bonds, other investments, earnings from investments, and contributions by the employer and employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=64852052&loc=d3e1703-114919 + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit from event reducing expected years of future service of present employees or eliminating accrual of defined benefits for some or all future services of present employees. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(7) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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