Other Comprehensive Income Changes in accumulated other comprehensive income (Details) - USD ($) $ in Thousands		3 Months Ended
		Mar. 28, 2020	Mar. 30, 2019	Dec. 28, 2019
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (350,933)	$ (276,476)
Currency Translation Adjustment		(48,916)	10,683
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(58,060)	(4,724)
Reclassification from accumulated other comprehensive income, current period, net of tax		(1,267)	766
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(59,327)	(3,947)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(410,260)	(280,423)
Accumulated Other Comprehensive (income) Loss, Defined Benefit Plan, Tax		(45,500)		$ (38,100)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Tax		(15,300)		$ (600)
Other Comprehensive Income (Loss), Reclassification Adjustment from AOCI on Derivatives, Tax		(9,300)	(3,200)
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, Tax		3,100	(1,400)
Cumulative Effect of New Accounting Principle in Period of Adoption			(100)
Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(105,705)	(112,771)
Currency Translation Adjustment		(48,916)	10,683
Reclassification from accumulated other comprehensive income, current period, net of tax		0	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(48,916)	10,683
Accumulated Other Comprehensive Income (Loss), Net of Tax		(154,621)	(102,088)
Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(228,336)	(170,938)
Other Comprehensive (Income) Loss, Defined Benefit Plan, before Reclassification Adjustment and Tax		14,808	(5,263)
Reclassification from accumulated other comprehensive income, current period, net of tax		0	0
Other Comprehensive Income (Loss), before Reclassifications, before Tax		14,808	(5,263)
Accumulated Other Comprehensive Income (Loss), Net of Tax		(213,528)	(176,201)
Interest Rate Swap | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income [Roll Forward]
Accumulated Other Comprehensive Income (Loss), Net of Tax		(16,892)	7,233
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax		(23,952)	(10,144)
Reclassification from accumulated other comprehensive income, current period, net of tax		(1,267)	766
Other Comprehensive Income (Loss), before Reclassifications, before Tax		(25,219)	(9,367)
Accumulated Other Comprehensive Income (Loss), Net of Tax		$ (42,111)	(2,134)
Accounting Standards Update 2017-12
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), adopt of new accounting pronouncement	[1]		11
Cumulative Effect of New Accounting Principle in Period of Adoption			0
Accounting Standards Update 2017-12 | Accumulated Translation Adjustment [Member]
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), adopt of new accounting pronouncement	[1]		0
Accounting Standards Update 2017-12 | Accumulated Defined Benefit Plans Adjustment
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), adopt of new accounting pronouncement	[1]		0
Accounting Standards Update 2017-12 | Interest Rate Swap | Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent
Accumulated Other Comprehensive Income [Roll Forward]
Other comprehensive income (loss), adopt of new accounting pronouncement	[1]		$ 11

[1] As of December 30, 2018, the company adopted ASU No. 2017-12, "Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities" using the modified retrospective method. The adoption of this guidance resulted in the recognition of less than $(0.1) million as an adjustment to the opening balance of retained earnings.