CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 27, 2015	Jun. 28, 2014	Jun. 27, 2015	Jun. 28, 2014
Statement of Comprehensive Income [Abstract]
Net income	$ 49,245	$ 35,816	$ 80,859	$ 68,174
Foreign currency translation adjustment and other	17,953	12,902	(14,716)	7,884
Cumulative translation adjustment related to intercompany loan forgiveness	0	0	(2,341)	0
Pension and other post-retirement benefit plans:
Amortization of net loss and prior service benefit included in net periodic pension cost	761	291	1,490	580
Comprehensive income, before income taxes	67,959	49,009	65,292	76,638
Income tax expense related to items of other comprehensive income (Note 10)	263	129	480	148
Comprehensive income, net of income taxes	67,696	48,880	64,812	76,490
Less: Comprehensive income related to noncontrolling interests	805	489	878	140
Comprehensive income attributable to common shareholders	$ 66,891	$ 48,391	$ 63,934	$ 76,350