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Income Taxes (Details)
3 Months Ended 6 Months Ended 9 Months Ended 12 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2019
Mar. 31, 2018
Jun. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]            
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent     35.00% 21.00%   28.10%
Effective income tax rate (as a percent) 18.20% 23.70%   14.70% (41.50%)