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Geographic Assets - Composition of Long-Lived Asset (Details) - USD ($)
$ in Thousands
Sep. 26, 2025
Dec. 27, 2024
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net $ 72,605 $ 84,889
Finance lease right-of-use assets, net 0 37
Operating lease right-of-use assets, net 31,339 36,850
Total 103,944 121,776
UNITED STATES    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 54,948 68,318
Finance lease right-of-use assets, net   37
Operating lease right-of-use assets, net 22,420 27,754
Total 77,368 96,109
SWITZERLAND    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 17,213 16,084
Operating lease right-of-use assets, net 5,633 6,414
Total 22,846 22,498
Other [Member]    
Revenues from External Customers and Long-Lived Assets [Line Items]    
Property, plant and equipment, net 444 487
Operating lease right-of-use assets, net 3,286 2,682
Total $ 3,730 $ 3,169