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Statements of Operations (Parenthetical) (Detail) (USD $) | 3 Months Ended | 12 Months Ended | 3 Months Ended |  |  |  | 3 Months Ended
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Sep. 30, 2012 Employee | Dec. 31, 2011 | Sep. 30, 2011 | Jun. 30, 2011 | Mar. 31, 2011 | Dec. 31, 2012 | Dec. 31, 2011 | Jun. 30, 2012 Semiconductor Test Employee | Jun. 30, 2011 Semiconductor Test Employee | Mar. 31, 2011 Semiconductor Test Employee | Dec. 31, 2011 Litepoint Corporation | Sep. 30, 2011 Litepoint Corporation | Dec. 31, 2012 Litepoint Corporation | Jun. 30, 2012 Litepoint Corporation | Mar. 31, 2012 Litepoint Corporation | Sep. 30, 2012 Systems Test Group Employee | Sep. 30, 2012 Wireless Test Employee
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Pension settlement charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ (400,000) | $ (6,500,000) | $ (1,800,000) |  |
Severance benefit and charges | 700,000 |  |  |  |  |  |  |  |  | 200,000 |  | 300,000 | 300,000 | 800,000 |  |  |  |  |  | 500,000 | 200,000
Reduction in employees headcount | 9 |  |  |  |  |  |  |  |  |  |  | 10 | 2 | 5 |  |  |  |  |  | 7 | 2
Gain on disposal of discontinued operations, tax |  | 4,578,000 | [1],[2] | 4,578,000 | [3] | 4,578,000 | [4] | 4,578,000 | [5] |  | 4,578,000 |  |  |  |  |  |  |  |  |  |
Early exit of leased facility |  |  |  |  |  |  |  |  |  |  |  |  |  | (400,000) |  |  |  |  |  |  |
Pension settlement charges |  |  |  |  |  |  |  |  |  |  |  |  | 700,000 |  | 3,300,000 |  |  |  |  |  |
Acquisition charges |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 500,000 | $ 1,400,000 |  |  |  |  |
[1] | Restructuring and other, net includes $0.5 million of charges related to pension settlement and $3.3 million to the acquisition of LitePoint.
[2] | In the fourth quarter ended December 31, 2011, the change in recognizing pension and postretirement benefit plans expense, as a result of the mark-to-market adjustments, decreased gross profit and net income by $2.4 million and $6.1 million, respectively. See Note B: "Accounting Policies" for a discussion of our accounting policy.
[3] | Restructuring and other, net includes $1.4 million of charges related to the acquisition of LitePoint.
[4] | Restructuring and other, net includes $0.3 million of severance charges related to headcount reductions of approximately 2 people in Semiconductor Test and $0.7 million related to pension settlement charges.
[5] | Restructuring and other, net includes $0.8 million of severance charges related to headcount reductions of approximately 5 people in Semiconductor Test and $(0.4) million credit related to early exit of previously impaired leased facilities in Westford and North Reading, Massachusetts.

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