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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 | Mar. 31, 2012 | Mar. 31, 2011
--- | --- | --- | ---
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated foreign currency translation adjustments | $ 410 | $ 375 | $ 300
Pension plans, defined benefit |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated pension benefit adjustments/Accumulated other postretirement benefit adjustments | (8,283) | (8,515) | (5,418)
Other postretirement benefit plans |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Accumulated pension benefit adjustments/Accumulated other postretirement benefit adjustments | $ (160) | $ (20) | $ 106

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