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Income Taxes (Details)
3 Months Ended 6 Months Ended
Dec. 22, 2017
Dec. 21, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2017
Dec. 31, 2016
Reconciliation to income tax at the statutory rate:            
Effective income tax rate (as a percent)     4.10% 41.40% 233.30% 26.80%
U.S. Federal tax at statutory rates (as a percent) 21.00% 35.00%