Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 25, 2021	Dec. 26, 2020
Net income (loss)	$ 96,847	$ 167,325	$ (13,801)
Other comprehensive income (loss), net of tax
Foreign currency translation adjustments	(17,950)	(22,956)	27,321
Adjustments related to postretirement benefits, net of tax	5,894	2,602	2,383
Change in unrealized gain/loss on investments	(694)	(67)	0
Reclassification due to sale of PBC Test Business, net of tax	0	(2,515)	0
Other comprehensive income (loss), net of tax	(12,750)	(22,936)	29,704
Comprehensive income	$ 84,097	$ 144,389	$ 15,903