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Income Taxes (Details)
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Income Taxes        
Effective income tax rate (as a percent) 31.00% 32.60% 32.50% 42.90%
Effective income tax rates as compared to the U.S. Federal income tax rate        
U.S. federal statutory rate (as a percent)     35.00%