CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 26, 2021	Jun. 27, 2020	Jun. 26, 2021	Jun. 27, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 89,916	$ 67,668	$ 153,851	$ 118,505
Other comprehensive income (loss):
Foreign currency translation adjustment	20,827	6,750	30,656	(38,105)
Amortization of net loss and prior service benefit included in net periodic cost for pension and other post-retirement benefit plans	993	1,365	1,981	2,739
Comprehensive income, before income taxes related to items of other comprehensive income	111,736	75,783	186,488	83,139
Less: Income tax expense (benefit) related to items of other comprehensive income	2,449	1,862	1,424	(177)
Comprehensive income, net of income taxes	109,287	73,921	185,064	83,316
Less: Comprehensive income (loss) related to noncontrolling interests, net of income taxes	1,843	284	4,233	(192)
Comprehensive income attributable to common shareholders, net of income taxes	$ 107,444	$ 73,637	$ 180,831	$ 83,508