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Earnings Per Common Share (Narrative) (Details)
In Millions, unless otherwise specified
12 Months Ended
Mar. 31, 2015
Mar. 31, 2014
Mar. 31, 2013
Earnings Per Share [Abstract]      
Potentially dilutive shares excluded from diluted earnings per share 1us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount 2us-gaap_AntidilutiveSecuritiesExcludedFromComputationOfEarningsPerShareAmount