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Business Acquisitions - Pro Forma Results of Acquisitions (Detail) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Business Combinations [Abstract]    
Revenue $ 781.3 $ 806.4
Income from operations 41.2 88.8
Net income $ 1.2 $ 63.7
Net income per share, basic $ 0.02 $ 0.91
Net income per share, diluted $ 0.02 $ 0.87