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ESOP Total Amount Contributed to the Plan Trust (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Mar. 31, 2012
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]      
Employee stock ownership plan (ESOP), cash contributions to ESOP $ 0.7 $ 1.7 $ 2.0
Unallocated common stock dividend, debt repayment $ 0.6