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Accumulated Other Comprehensive Items - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands | 12 Months Ended
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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)

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