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Goodwill and Intangible Assets - Summary of Changes to Goodwill Balance (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Goodwill [Line Items]    
Beginning balance $ 169.2 $ 56.9
Acquisitions 8.1 112.3
Translation adjustments (0.1)  
Ending balance $ 177.2 $ 169.2