Schedule of Amortizable Intangible Assets (Parenthetical) (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Jul. 03, 2016	Oct. 02, 2016		Dec. 31, 2015
Finite-Lived Intangible Assets
Gross Carrying Amount		$ 497,547	[1]	$ 546,388	[2]
Accumulated Amortization		382,428	[1],[3]	303,227	[2]
Net Carrying Amount		114,146		239,831
Intangible assets impairment		83,339
Wireless Test
Finite-Lived Intangible Assets
Net Carrying Amount	$ 5,800
Intangible assets impairment	$ 83,000	83,339
Fully Amortized Intangibles
Finite-Lived Intangible Assets
Gross Carrying Amount		48,000		98,200
Accumulated Amortization		48,000		98,200
Net Carrying Amount		$ 0		$ 0

[1] In 2016, $48 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.

[2] In 2015, $98.2 million of amortizable intangible assets became fully amortized and have been eliminated from the gross carrying amount and accumulated amortization.

[3] Includes an $83 million impairment of Wireless Test amortizable intangible assets.