Derivatives - Fair Value (Details) - USD ($) $ in Thousands	Dec. 30, 2017	Dec. 31, 2016
Derivatives Designated as Hedging Instruments | Interest rate swap agreements | Other Long-Term Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	$ 126	$ 62
Derivative Asset, Notional Amount	10,000	10,000
Derivatives Designated as Hedging Instruments | Forward Currency-Exchange Contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	0	(41)
Derivative Liability, Notional Amount	0	2,380
Derivatives Not Designated as Hedging Instruments | Forward Currency-Exchange Contracts | Other Current Liabilities
Derivatives, Fair Value [Line Items]
Derivative Liability, Fair Value, Gross Liability	(16)	(237)
Derivative Liability, Notional Amount	2,049	17,185
Derivatives Not Designated as Hedging Instruments | Forward Currency-Exchange Contracts | Other Current Assets
Derivatives, Fair Value [Line Items]
Derivative Asset, Fair Value, Gross Asset	17	2
Derivative Asset, Notional Amount	$ 1,244	$ 227