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Intangible Assets - Other Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 26, 2021	Dec. 25, 2020
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Total Cost	$ 274,257	$ 274,080
Total Foreign Currency Translation	(10,098)	(6,354)
Finite Life
Accumulated amortization	(111,367)	(107,057)
Total Book Value	152,792	160,669
Trade Names
Indefinite Life
Cost	61,920	61,920
Indefinite-lived Intangible Assets, Foreign Currency Translation Gain (Loss)	(1,812)	188
Book value	60,108	62,108
Customer Relationships
Finite Life
Cost	186,073	186,073
Accumulated amortization	(97,426)	(93,832)
Foreign currency translation	(7,625)	(6,004)
Book value	$ 81,022	$ 86,237
Weighted average life in years	13 years	13 years
Patents and Proprietary Technology
Finite Life
Cost	$ 25,364	$ 25,187
Accumulated amortization	(13,603)	(12,924)
Foreign currency translation	(661)	(538)
Book value	$ 11,100	$ 11,725
Weighted average life in years	10 years	10 years
Trademarks, Trade Names and Other
Finite Life
Cost	$ 900	$ 900
Accumulated amortization	(338)	(301)
Foreign currency translation	0	0
Book value	$ 562	$ 599
Weighted average life in years	5 years	5 years

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