Restructuring and Other - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
Sep. 29, 2013 Employee	Sep. 30, 2012 Employee
Restructuring Cost and Reserve
Severance benefit and charges	$ 1.3	$ 0.7
Reduction in employees head count	40	9
Change in estimated exit costs related to leased facility	(0.4)
Accrual for severance and benefits	0.5
Business acquisition, contingent consideration	8.4
System Test
Restructuring Cost and Reserve
Severance benefit and charges	1.0	0.5
Reduction in employees head count		7
Wireless Test
Restructuring Cost and Reserve
Severance benefit and charges		0.2
Reduction in employees head count		2
Semiconductor Test
Restructuring Cost and Reserve
Severance benefit and charges	$ 0.3

Carrying value as of the balance sheet date of obligations, excluding pension and other postretirement benefits, incurred through that date and payable for perquisites provided to employees pertaining to services received from them. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Includes, but is not limited to, one-time termination benefits, termination of an operating lease or other contract, consolidating or closing facilities, and relocating employees, and termination benefits associated with an ongoing benefit arrangement. Excludes expenses associated with special or contractual termination benefits, a discontinued operation or an asset retirement obligation.

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- Definition

Amount of expenses for special or contractual termination benefits provided to current employees involuntarily terminated under a benefit arrangement associated exit or disposal activities pursuant to an authorized plan. Excludes expenses related to one-time termination benefits, a discontinued operation or an asset retirement obligation.

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