Schedule of Changes in Fair Value of Level 3 Contingent Consideration (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 02, 2016	Oct. 04, 2015	Oct. 02, 2016	Oct. 04, 2015	Jun. 11, 2015
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration			$ 11,697
Increase(decrease)in contingent consideration	$ 8,000		10,451	$ (2,600)
Universal Robots
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Payments of contingent consideration			$ 15,000
EBITDA contingent consideration amount, percentage	100.00%		100.00%
Increase(decrease)in contingent consideration	$ 8,000		$ 9,900
Contingent consideration					$ 31,600
Avionics Interface Technologies, LLC
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase(decrease)in contingent consideration		$ (1,000)	$ 600	(1,000)
ZTEC Instruments, Inc.
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Increase(decrease)in contingent consideration				(1,600)
Contingent consideration		$ 0		$ 0