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Restructuring and Other - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Apr. 01, 2012
Restructuring Cost and Reserve
Business acquisition, contingent consideration		$ 1.9
Remaining accrual for lease payments	0.8
Lease expiration date	Oct. 31, 2013
Accrual Severnce and benefits	0.2
Unoccupied Space Subleased	20.00%
Quarter One Two Thousand Thirteen Activity | Systems Test Group
Restructuring Cost and Reserve
Severance benefit and charges	$ 0.4
Reduction in employees head count	2
Quarter One Two Thousand Thirteen Activity | Semiconductor Test
Restructuring Cost and Reserve
Reduction in employees head count	2

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- Definition

Change Of Business Acquisition Contingent Consideration At Fair Value

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Remaining accrual for lease payments.

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The company has subleased approximately 53% of its unoccupied space

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- Definition

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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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

-Number 43

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-Publisher AICPA

-Name Accounting Research Bulletin (ARB)

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-Section A

-Paragraph 8

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Date which lease or group of leases is set to expire, in CCYY-MM-DD format.

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- Definition

The number of positions eliminated during the period as a result of restructuring activities.

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- Definition

The charge against earnings in the period for known and estimated costs of termination benefits provided to current employees that are involuntarily terminated under a benefit arrangement associated with exit from or disposal of business activities or restructurings pursuant to a duly authorized plan, excluding costs or losses pertaining to an entity newly acquired in a business combination or a discontinued operation as defined by generally accepted accounting principles and costs associated with one-time termination benefits.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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