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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Income Tax Disclosure [Abstract]        
Income tax expense $ 3.8 $ 8.6 $ 15.2 $ 29.7
Approximate rate on pre-tax income 47.50% 20.00% 63.10% 22.60%
U.S. federal statutory rate     35.00%