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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Goodwill and Intangible Assets Disclosure [Abstract]    
Beginning balance $ 177.2 $ 169.2
Acquisitions 17.7 8.1
Translation adjustments (0.2) (0.1)
Measurement period adjustments 0.6 (0.1)
Ending balance $ 195.3 $ 177.2