Fair Value Measurements and Disclosures - Notional Amounts and Fair Values of Outstanding Derivative Instruments (Details) - Forward Foreign Currency Contracts [Member] - Not Designated as Hedging Instrument [Member] - USD ($)	Jun. 30, 2018	Dec. 30, 2017
Purchase [Member]
Derivatives Fair Value [Line Items]
Notional Amount	$ 13,700,000	$ 27,500,000
Fair Value Asset	0	0
Fair Value Liability	0	100,000
Sell [Member]
Derivatives Fair Value [Line Items]
Notional Amount	24,900,000	16,800,000
Fair Value Asset	0	100,000
Fair Value Liability	$ 0	$ 0