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Accumulated Other Comprehensive Items - Reclassification Out of AOCI (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 28, 2019
Dec. 29, 2018
Dec. 30, 2017
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net $ (6,359) $ (2,417) $ (872)
Interest expense (12,755) (7,032) (3,547)
Cost of revenues (410,884) (355,505) (283,886)
Total (expense) income before income taxes 68,922 79,528 57,653
Income tax benefit (provision) (16,358) (18,482) (26,070)
Net Income 52,564 61,046 31,583
Reclassification out of Accumulated Other Comprehensive Income      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Net Income (6,727) (1,700) (548)
Reclassification out of Accumulated Other Comprehensive Income | Retirement Benefit Plans      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total (expense) income before income taxes (5,963) (2,257) (710)
Income tax benefit (provision) (641) 549 246
Net Income (6,604) (1,708) (464)
Reclassification out of Accumulated Other Comprehensive Income | Amortization of net actuarial loss      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net (70) (740) (563)
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 (6) (92) (147)
Reclassification out of Accumulated Other Comprehensive Income | Settlement and curtailment losses      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Other expense, net (5,887) (1,425) 0
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Total (expense) income before income taxes (177) 11 (127)
Income tax benefit (provision) 54 (3) 43
Net Income (123) 8 (84)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Interest rate swap agreements      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Interest expense (8) (11) (30)
Reclassification out of Accumulated Other Comprehensive Income | Cash Flow Hedges | Forward Currency-Exchange Contracts      
Reclassification Adjustment Out Of Accumulated Other Comprehensive Items [Line Items]      
Cost of revenues $ (169) $ 22 $ (97)