Derivative Financial Instruments and Fair Value Measurements (Schedule of Fair Value Measurements) (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 30, 2017	Apr. 01, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent Consideration	$ (8,904)	$ (11,320)	$ (15,130)	$ (15,279)
Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories Carried At Market	4,368	3,838
Contingent Consideration	(8,904)	(11,320)
Embedded Derivative	2,690	2,690
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset Notional Amount	(710)	(1,060)
Fair Value, Measurements, Recurring [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Flow Hedge Derivative Instrument Assets At Fair Value	575	(435)
Fair Value, Measurements, Recurring [Member] | Short [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	202	738
Unrealized Derivative Liability	(1,266)	(240)
Fair Value, Measurements, Recurring [Member] | Long [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	45	0
Unrealized Derivative Liability	(8)	(4)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories Carried At Market	0	0
Contingent Consideration	0	0
Embedded Derivative	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset Notional Amount	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Flow Hedge Derivative Instrument Assets At Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Short [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	0	0
Unrealized Derivative Liability	(56)	(35)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 1 [Member] | Long [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	0	0
Unrealized Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories Carried At Market	4,368	3,838
Contingent Consideration	0	0
Embedded Derivative	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset Notional Amount	(710)	(1,060)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Flow Hedge Derivative Instrument Assets At Fair Value	575	(435)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Short [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	202	738
Unrealized Derivative Liability	(1,210)	(205)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Long [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	45	0
Unrealized Derivative Liability	(8)	(4)
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Inventories Carried At Market	0	0
Contingent Consideration	(8,904)	(11,320)
Embedded Derivative	2,690	2,690
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] | Not Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Asset Notional Amount	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Foreign Exchange Forward [Member] | Designated as Hedging Instrument [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cash Flow Hedge Derivative Instrument Assets At Fair Value	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Short [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	0	0
Unrealized Derivative Liability	0	0
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 3 [Member] | Long [Member] | Future And Forward Contracts [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Unrealized Derivative Asset	0	0
Unrealized Derivative Liability	$ 0	$ 0