Consolidated Statements of Other Comprehensive Income (Loss) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jul. 01, 2017	Jun. 30, 2018	Jul. 01, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 35,452	$ 46,778	$ 75,723	$ 53,206
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments, net of tax of $0	(56,135)	38,029	(36,621)	55,631
Interest rate hedge adjustments, net of tax (benefit) expense of ($350), ($75), ($350) and $887, respectively	873	(30)	1,392	2,105
Defined benefit pension plans, net of tax expense of $1,023, $980, $2,019 and $1,779, respectively	1,977	1,923	3,981	4,029
Total other comprehensive (loss) income, net of tax	(53,285)	39,922	(31,248)	61,765
Comprehensive (loss) income	$ (17,833)	$ 86,700	$ 44,475	$ 114,971