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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]    
Beginning balance $ 195.3 $ 177.2
Acquisitions 116.3 17.7
Adjustments to acquisitions 3.6 0.6
Translation adjustments 0.9 (0.2)
Ending balance $ 316.1 $ 195.3