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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Income Tax Disclosure [Abstract]        
Income tax expense $ 6.2 $ 7.9 $ 11.4 $ 21.1
Approximate rate on pre-tax income 51.20% 17.60% 70.80% 23.80%
U.S. federal statutory rate     35.00%