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ESOP Compensation Expense (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]      
Length of service requirement 1 year 0 months 0 days 1 year 0 months 0 days 1 year 0 months 0 days
Employee stock ownership plan (ESOP), compensation expense $ 6.6 $ 5.0 $ 4.4