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Income Taxes - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2015
Dec. 31, 2014
Income Tax Disclosure [Abstract]        
Income tax expense $ 14.7 $ 13.9 $ 31.6 $ 23.8
Approximate rate on pre-tax income 33.00% 37.00% 36.00% 37.00%
U.S. federal statutory rate 35.00%   35.00%  
Non-current deferred tax assets $ 13.5   $ 13.5