Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 29, 2018	Jun. 30, 2017	Jun. 29, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net earnings	$ 15,094	$ 13,458	$ 29,160	$ 19,749
Other comprehensive income (loss), net of tax:
Foreign currency translation adjustments	(11,969)	13,777	(5,956)	16,374
Unrealized gain on derivative instruments, net of tax expense of $0 and $5 and $1 and $115, respectively	0	7	1	191
Change in pension and post-retirement benefit plan liabilities, net of tax expense of $703 and $1,335 and $1,413 and $2,670, respectively	2,203	2,159	4,420	4,368
Other comprehensive income (loss)	(9,766)	15,943	(1,535)	20,933
Comprehensive income	$ 5,328	$ 29,401	$ 27,625	$ 40,682