Annual report pursuant to Section 13 and 15(d)

Employee Benefit Plans (Details 14)

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Employee Benefit Plans (Details 14) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Decrease in accumulated other comprehensive (income) loss, net of income tax      
Total $ (92) $ 3,223 $ 707
Other postretirement benefit plans [Member]
     
Decrease in accumulated other comprehensive (income) loss, net of income tax      
Net actuarial loss arising during the year 61 43  
Amortization of actuarial loss (28) (24)  
Amortization of prior service cost 107 107  
Total $ 140 $ 126