Inventories (Tables)

3 Months Ended

Mar. 31, 2018

Notes To Financial Statements [Abstract]

Schedule of Inventory, Current

Inventories at March 31, 2018 and December 30, 2017 are as follows: 

	Mar 31, 2018		Dec 30, 2017
	(in thousands)
Raw materials and parts	$	193,565	$	180,559
Work-in-process	49,065		38,917
Finished goods	216,521		205,163
	$	459,151	$	424,639