Financial Instruments - Additional Information (Detail) - USD ($)	3 Months Ended		9 Months Ended		12 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Dec. 31, 2015
Financial Instruments and Fair Value [Line Items]
Available-for-sale securities, realized loss	$ 100,000		$ 400,000	$ 200,000
Available-for-sale securities, realized gain	700,000	$ 400,000	1,200,000	1,400,000
Available-for-sale marketable securities, Fair Market Value of Investments with Unrealized Losses	458,774,000		458,774,000		$ 601,660,000
Fair market value of investments with unrealized losses greater than one year	3,100,000		3,100,000		900,000
Aggregate loss of investments with unrealized losses greater than one year			200,000		500,000
Fair market value of investments with unrealized losses less than one year	455,700,000		455,700,000		600,800,000
Aggregate loss of investments with unrealized losses less than one year			400,000		3,600,000
Gains (losses) on foreign currency transactions	1,900,000	100,000	12,200,000	2,300,000
Realized gain(loss) on foreign currency contracts	(700,000)	$ (800,000)	(10,800,000)	$ (2,700,000)
Universal Robots
Financial Instruments and Fair Value [Line Items]
Maximum payment per earn-out			25,000,000
Avionics Interface Technologies, LLC
Financial Instruments and Fair Value [Line Items]
Maximum payment per earn-out			1,050,000
Foreign Currency Forward Contracts
Financial Instruments and Fair Value [Line Items]
Notional amount of foreign currency forward contracts	$ 76,500,000		76,500,000		114,100,000
Gains (losses) on foreign currency transactions			$ 400,000		$ 0