Accumulated Other Comprehensive Items - Reclassification Out of AOCI (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Oct. 01, 2016	Oct. 03, 2015	Oct. 01, 2016	Oct. 03, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Interest expense	$ (305)	$ (239)	$ (914)	$ (701)
Cost of revenues	(57,440)	(48,261)	(171,569)	(148,775)
Selling, general, and administrative expenses	(33,527)	(29,200)	(102,095)	(92,490)
Amortization of Prior Service Cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Income from Continuing Operations			(71)	(70)
Amortization of Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Income from Continuing Operations			(361)	(282)
Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Income from Continuing Operations			(364)	1,308
Reclassification out of Accumulated Other Comprehensive Items [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Income from Continuing Operations	(206)	20	(796)	956
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Amortization of Prior Service Cost [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Selling, general, and administrative expenses	(38)	(37)	(113)	(110)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Amortization of Actuarial Losses [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Selling, general, and administrative expenses	(145)	(144)	(551)	(433)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Pension and Other Post-retirement Plans [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Total (expense) income before income taxes	(183)	(181)	(664)	(543)
Income tax benefit (provision)	64	64	232	191
Income from Continuing Operations	(119)	(117)	(432)	(352)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Total (expense) income before income taxes	(134)	131	(363)	1,426
Income tax benefit (provision)	47	6	(1)	(118)
Income from Continuing Operations	(87)	137	(364)	1,308
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Cash Flow Hedges [Member] \| Interest Rate Swap [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Interest expense	(21)	(106)	(157)	(317)
Reclassification out of Accumulated Other Comprehensive Items [Member] \| Cash Flow Hedges [Member] \| Forward Currency-Exchange Contracts [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Items [Line Items]
Revenue	0	0	(24)	0
Cost of revenues	(113)	0	(182)	0
Selling, general, and administrative expenses	$ 0	$ 237	$ 0	$ 1,743

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Amount of the cost of borrowed funds accounted for as interest expense.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount before tax of reclassification adjustments of other comprehensive income (loss).

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Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

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