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Income Taxes (Details)
3 Months Ended 6 Months Ended
Sep. 30, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Income Tax Disclosure [Line Items]        
Effective income tax rate 32.90% 34.60% 29.80% 33.80%
U.S. federal statutory income tax rate 35.00% 35.00% 35.00% 35.00%