Retirement Benefits (Other Tabular Disclosures) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 26, 2014	Dec. 27, 2013	Dec. 28, 2012
Change in plan assets
Fair value, beginning of year	$ 280,607
Fair value, end of year	277,208	280,607
Amounts recognized in consolidated balance sheets
Non-current liabilities	136,812	94,705
Information for plans with accumulated benefit obligation in excess of plan assets
Projected benefit obligation	389,692	352,271
Accumulated benefit obligation	360,945	326,030
Fair value of plan assets	277,208	280,607
Amounts recognized in other comprehensive (income) loss
Total	39,164	(46,955)	6,171
Pension Benefits
Change in benefit obligation
Obligation, beginning of year	352,271	359,701
Service cost	6,846	7,447	6,414
Interest cost	15,944	14,149	13,729
Actuarial loss (gain)	44,290	(15,653)
Plan changes	0	3,197
Benefit payments	(23,593)	(10,762)
Settlements	0	(7,430)
Exchange rate changes	(6,066)	1,622
Obligation, end of year	389,692	352,271	359,701
Change in plan assets
Fair value, beginning of year	280,607	246,606
Actual return on assets	21,622	40,280
Employer contributions	1,814	10,728
Benefit payments	(23,593)	(10,762)
Settlements	0	(7,241)
Exchange rate changes	(3,242)	996
Fair value, end of year	277,208	280,607	246,606
Funded status	(112,484)	(71,664)
Amounts recognized in consolidated balance sheets
Current liabilities	1,308	1,116
Non-current liabilities	111,176	70,548
Total liabilities	112,484	71,664
Components of net periodic benefit cost
Service cost-benefits earned during the period	6,846	7,447	6,414
Interest cost on projected benefit obligation	15,944	14,149	13,729
Expected return on assets	(21,253)	(18,508)	(15,907)
Amortization of prior service cost (credit)	320	8	(5)
Amortization of net loss (gain)	4,929	10,456	10,814
Cost of pension plans which are not significant and have not adopted ASC 715	80	94	121
Net periodic benefit cost	6,866	13,646	15,166
Amounts recognized in other comprehensive (income) loss
Net loss (gain) arising during the period	42,733	(37,284)
Prior service cost (credit) arising during the period	0	3,197
Amortization of net gain (loss)	(4,929)	(10,456)
Amortization of prior service credit (cost)	(320)	(8)
Total	37,484	(44,551)
Amounts recognized in accumulated ther comprehensive income
Prior service cost (credit)	2,658	3,271
Net loss	111,298	73,200
Net before income taxes	113,956	76,471
Income taxes	(39,011)	(26,903)
Net	74,945	49,568
Expected to be recognized in following year
Prior service cost (credit)	295
Net loss (gain)	8,922
Net before income taxes	9,217
Income taxes	(3,318)
Net	5,899
Estimated future benefit payments
2015	15,290
2016	17,085
2017	16,299
2018	17,417
2019	18,248
Years 2020 - 2024	105,418
U.S. Plans
Assumptions used to determine benefit obligations
Discount rate	4.20%	5.00%
Rate of compensation increase	3.00%	3.00%
Assumptions used to determine net periodic benefit cost
Discount rate	5.00%	4.20%	4.60%
Rate of compensation increase	3.00%	3.00%	3.00%
Expected return on assets	8.50%	8.50%	8.50%
Non-U.S. Plans
Assumptions used to determine benefit obligations
Discount rate	1.50%	2.50%
Rate of compensation increase	1.30%	1.30%
Assumptions used to determine net periodic benefit cost
Discount rate	2.50%	2.30%	2.90%
Rate of compensation increase	1.30%	1.20%	1.20%
Expected return on assets	2.00%	3.00%	3.00%
Postretirement Medical Benefits
Change in benefit obligation
Obligation, beginning of year	21,342	23,472
Service cost	486	626	589
Interest cost	981	961	986
Actuarial loss (gain)	1,037	(2,582)
Plan changes	0	0
Benefit payments	(1,082)	(1,135)
Settlements	0	0
Exchange rate changes	0	0
Obligation, end of year	22,764	21,342	23,472
Change in plan assets
Fair value, beginning of year	0	0
Actual return on assets	0	0
Employer contributions	1,082	1,135
Benefit payments	(1,082)	(1,135)
Settlements	0	0
Exchange rate changes	0	0
Fair value, end of year	0	0	0
Funded status	(22,764)	(21,342)
Amounts recognized in consolidated balance sheets
Current liabilities	1,165	1,256
Non-current liabilities	21,599	20,086
Total liabilities	22,764	21,342
Components of net periodic benefit cost
Service cost-benefits earned during the period	486	626	589
Interest cost on projected benefit obligation	981	961	986
Expected return on assets	0	0	0
Amortization of prior service cost (credit)	(658)	(658)	(658)
Amortization of net loss (gain)	15	480	395
Net periodic benefit cost	824	1,409	1,312
Amounts recognized in other comprehensive (income) loss
Net loss (gain) arising during the period	1,037	(2,582)
Prior service cost (credit) arising during the period	0	0
Amortization of net gain (loss)	(15)	(480)
Amortization of prior service credit (cost)	658	658
Total	1,680	(2,404)
Amounts recognized in accumulated ther comprehensive income
Prior service cost (credit)	(1,786)	(2,444)
Net loss	4,347	3,325
Net before income taxes	2,561	881
Income taxes	(922)	(317)
Net	1,639	564
Expected to be recognized in following year
Prior service cost (credit)	(676)
Net loss (gain)	271
Net before income taxes	(405)
Income taxes	146
Net	(259)
Assumptions used to determine benefit obligations
Discount rate	4.20%	5.00%
Assumptions used to determine net periodic benefit cost
Discount rate	5.00%	4.20%	4.60%
Estimated future benefit payments
2015	1,165
2016	1,259
2017	1,310
2018	1,373
2019	1,440
Years 2020 - 2024	$ 7,873

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The net of tax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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Amount, net of tax effect, included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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The tax effect of the aggregate amount in accumulated other comprehensive income expected to be recognized as a component of net periodic benefit cost over the fiscal year that follows the most recent annual statement of financial position presented, including the net gain (loss), net prior service cost or credit, and net transition asset or obligation.

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The pretax total of net gain (loss), prior service cost (credit), and transition assets (obligations), as well as minimum pension liability if still remaining, included in accumulated other comprehensive income associated with a defined benefit pension or other postretirement plan(s) because they have yet to be recognized as components of net periodic benefit cost.

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The pretax net amount of gains and losses that are not yet recognized as a component of net periodic benefit cost, and that are recognized as increases or decreases in other comprehensive income as they arise. Gains and losses are due to changes in the value of either the benefit obligation or the plan assets resulting from experience different from that assumed or from a change in an actuarial assumption, or the consequence of a decision to temporarily deviate from the substantive plan.

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Amount related to the pretax cost of benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation, which has not yet been recognized as components of net periodic benefit cost.

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The difference between fair value of plan assets at the end of the period and the fair value at the beginning of the period, adjusted for contributions and payments of benefits during the period, and after adjusting for taxes and other expenses, as applicable.

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Amount of gain (loss) related to change in benefit obligation resulting from changes in actuarial assumptions, for example, but not limited to, interest, mortality, employee turnover, salary, and temporary deviation from the substantive plan.

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The amount of gains or losses recognized in net periodic benefit cost.

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The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation.

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Amount included in accumulated other comprehensive income (AOCI) expected to be recognized as components of net periodic benefit cost for the fiscal year that follows the most recent annual statement of financial position, including gain (loss), prior service cost (credit), and transition asset (obligation).

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The interest rate used to adjust for the time value of money for the plan.

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Expected rate of compensation increases (for pay-related plans).

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The interest rate used to adjust for the time value of money.

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An assumption as to the rate of return on plan assets reflecting the average rate of earnings expected on the funds invested or to be invested to provide for the benefits included in the benefit obligation.

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Expected rate of compensation increases (for pay-related plans).

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1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date.

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The amount of payments made for which participants are entitled under a pension plan, including pension benefits, death benefits, and benefits due on termination of employment. Also includes payments made under a postretirement benefit plan, including prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. This item represents a periodic decrease to the plan obligations and a decrease to plan assets.

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The increase in the fair value of plan assets from contributions made by the employer.

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Amount of benefits expected to be paid in the five fiscal years after the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the next fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fifth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the fourth fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the third fiscal year following the latest fiscal year from a defined benefit plan.

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Amount of benefits expected to be paid in the second fiscal year following the latest fiscal year from a defined benefit plan.

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An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets.

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The amount of increase or decrease in plan assets attributed to foreign currency changes. The effects of foreign currency exchange rate changes that are to be disclosed are those applicable to plans of a foreign operation whose functional currency is not the reporting currency.

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Changes in the defined benefit obligation, not otherwise separately disclosed in the financial statements.

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Amount of other defined benefit plan costs.

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If aggregate disclosures are presented, the aggregate pension accumulated benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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If aggregate disclosures are presented, the aggregate projected benefit obligation for pension plans with accumulated benefit obligations in excess of plan assets as of the measurement date of each statement of financial position presented.

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The actuarial present value of benefits attributed by the pension benefit formula to services rendered by employees during the period. The portion of the expected postretirement benefit obligation attributed to employee service during the period. The service cost component is a portion of the benefit obligation and is unaffected by the funded status of the plan.

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Amount before tax of cost (credit) of benefit changes attributable to plan participants' prior service resulting from a plan amendment or plan initiation that has not been recognized in net periodic benefit cost (credit).

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