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Accumulated Other Comprehensive Items - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 29, 2018
Dec. 30, 2017
Dec. 31, 2016
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net $ (2,417) $ (872) $ (1,069)
Interest expense (7,032) (3,547) (1,293)
Cost of revenues (355,505) (283,886) (225,587)
Amortization of actuarial losses      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total Reclassifications (559)    
Amortization of prior service costs      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total Reclassifications (1,149)    
Cash Flow Hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total Reclassifications 8    
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total Reclassifications (1,700) (548) (964)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of actuarial losses      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net (740) (563) (701)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of prior service costs      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net (92) (147) (147)
Reclassification out of Accumulated Other Comprehensive Income | Curtailment loss      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net (1,425) 0 0
Reclassification out of Accumulated Other Comprehensive Income | Pension and Other Post-retirement Plans      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total income (expense) before income taxes (2,257) (710) (848)
Income tax (provision) benefit 549 246 295
Total Reclassifications (1,708) (464) (553)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total income (expense) before income taxes 11 (127) (374)
Income tax (provision) benefit (3) 43 (37)
Total Reclassifications 8 (84) (411)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Interest Rate Swap      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Interest expense (11) (30) (174)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Forward Currency-Exchange Contracts      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Revenues 0 0 (14)
Cost of revenues $ 22 $ (97) $ (186)