CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands		3 Months Ended				6 Months Ended
		Jul. 03, 2020		Jun. 28, 2019		Jul. 03, 2020		Jun. 28, 2019
Statement Of Income And Comprehensive Income [Abstract]
Consolidated net income		$ 11,660	[1]	$ 10,380	[2]	$ 23,607	[1]	$ 22,633	[2]
Other comprehensive income (loss):
Foreign currency translation adjustments, net of tax	[3]	1,498		(2,662)		(5,308)		(323)
Pension liability adjustments, net of tax	[4]	100		553		837		570
Total other comprehensive income (loss)		1,598		(2,109)		(4,471)		247
Total consolidated comprehensive income (loss)		$ 13,258		$ 8,271		$ 19,136		$ 22,880

[1] 71 thousand non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 thousand shares of restricted stock issued to the former Laser Quantum non-controlling interest shareholders are considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of July 3, 2020.

[2] 45 thousand non-GAAP EPS performance-based restricted stock units granted to certain members of the executive management team and 213 thousand shares of restricted stock issued to the former Laser Quantum non-controlling interest shareholders were considered contingently issuable shares and were excluded from the calculation of the denominator as the contingent conditions had not been met as of June 28, 2019.

[3] The tax effect on this component of comprehensive income was nominal for all periods presented.

[4] The tax effect on this component of comprehensive income was nominal for all periods presented. See Note 4 for the total amount of pension liability adjustments reclassified out of accumulated other comprehensive income (loss).