Geographic Assets - Composition of Long-Lived Assets (Details) - USD ($) $ in Thousands		Dec. 27, 2024	Dec. 29, 2023	Dec. 30, 2022
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net		$ 84,889	$ 66,835
Finance lease ROU assets, net		37	183
Operating lease ROU assets, net		36,850	34,387	$ 34,387
Total		121,776	101,405
U.S.
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net		68,318	55,851
Finance lease ROU assets, net		37	182
Operating lease ROU assets, net		27,754	26,501
Total		96,109	82,534
SWITZERLAND
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net		16,084	10,632
Finance lease ROU assets, net
Operating lease ROU assets, net		6,414	6,343
Total		22,498	16,975
Other
Revenues From External Customers And Long Lived Assets [Line Items]
Property, plant and equipment, net	[1]	487	352
Finance lease ROU assets, net	[1]	0	1
Operating lease ROU assets, net	[1]	2,682	1,543
Total	[1]	$ 3,169	$ 1,896

[1] No other location individually exceeds 10% of each category of long-lived assets.