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Consolidated Statements of Changes in Stockholders' Equity (Parenthetical) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Mar. 31, 2010
Pension and other postretirement benefits adjustments, net of income tax $ 1,726 $ 502 $ 1,289
Accumulated foreign currency translation adjustments 375 300 219
Accumulated pension benefit adjustment (8,515) (5,418) (4,845)
Accumulated other postretirement benefit adjustment (20) 106 240
Accumulated Other Comprehensive Loss
      
Pension and other postretirement benefits adjustments, net of income tax 1,726 502 1,289
Accumulated foreign currency translation adjustments 375 300 219
Accumulated pension benefit adjustment (8,515) (5,418) (4,845)
Accumulated other postretirement benefit adjustment $ (20) $ 106 $ 240