CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	12 Months Ended
	Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ (20,208)	$ 21,347	$ 39,665
Defined benefit plans:
Net change in plan assets	(1,830)	(3,946)	6,509
Reclassification into other income (expense), net	(77)	(357)	187
Investments available for sale:
Change in unrealized gain (loss)	28	363	(406)
Reclassification into other income (expense), net	3
Foreign currency translation loss	(1,775)	(1,095)	(2,090)
Tax effect	733	766	4
Other comprehensive income (loss), net of tax	(2,918)	(4,269)	4,204
Comprehensive income (loss)	$ (23,126)	$ 17,078	$ 43,869