Derivative Instruments and Hedging Activities - Notional and Fair Value (Details) $ in Thousands, € in Millions	12 Months Ended
	Oct. 01, 2016 USD ($)	Dec. 31, 2016 USD ($)	Aug. 01, 2016 EUR (€)	Aug. 01, 2016 USD ($)	Oct. 03, 2015 USD ($)
Derivatives, Fair Value [Line Items]
Forward contracts period of maturities	7 months
Short-term Bank Loans and Notes Payable				$ 750,000
unrealized loss on forward contracts purchased at Rofin acquisition	$ 2,200
Euro
Derivatives, Fair Value [Line Items]
forward contract purchased for the term loan | €			€ 670.0
Forecast
Derivatives, Fair Value [Line Items]
Net gain settled from hedges placed at Rofin acquisition		$ 3,100
Realized gain from settlement of hedges placed at Rofin acquisition		$ 5,300
Purchase | Derivatives not designated as hedging instruments | Euro
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	91,108				$ 52,699
Derivative Asset, Fair Value	162				33
Purchase | Derivatives not designated as hedging instruments | South Korean Won
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	31,248				253
Derivative Asset, Fair Value	413				0
Purchase | Derivatives not designated as hedging instruments | Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	0				558
Derivative Asset, Fair Value	0				8
Purchase | Other foreign currency hedge contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	6,033				3,283
Derivative Liability, Fair Value	4				49
Sell | Derivatives not designated as hedging instruments | Euro
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(750,454)				0
Derivative Liability, Fair Value	2,234				0
Sell | Derivatives not designated as hedging instruments | South Korean Won
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(37,929)				(17,747)
Derivative Asset, Fair Value					30
Derivative Liability, Fair Value	152
Sell | Derivatives not designated as hedging instruments | Chinese currency
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(25,237)				(10,900)
Derivative Liability, Fair Value	91				106
Sell | Derivatives not designated as hedging instruments | Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(36,450)				(15,804)
Derivative Liability, Fair Value	343				84
Sell | Designated as hedging instruments | Japanese Yen
Derivatives, Fair Value [Line Items]
Derivative Asset, Notional Amount	0				41
Derivative Liability, Notional Amount	0				(2,903)
Sell | Other foreign currency hedge contracts | Derivatives not designated as hedging instruments
Derivatives, Fair Value [Line Items]
Derivative Liability, Notional Amount	(1,775)				(5,835)
Derivative Asset, Fair Value	$ 38				$ 146