Annual report pursuant to Section 13 and 15(d)

Pension and Other Post-retirement Benefit Plans (Details 5)

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Pension and Other Post-retirement Benefit Plans (Details 5) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Mar. 31, 2011
Savings Plan      
Matched contribution of the entity $ 2,500 $ 2,200 $ 1,700
Maximum
     
Savings Plan      
Company matched contribution (as a percent) 6.00%