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Share-Based Compensation (Stock Option Valuation Assumptions) (Details) - Stock Options - USD ($)
6 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Expected volatility 37.80% 40.20%
Expected dividends $ 0 $ 0
Expected term in years 6 years 6 years
Risk-free rate 1.70% 1.70%