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Goodwill and Intangible Assets - Amortization on Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2013
Finite-Lived Intangible Assets [Line Items]      
Amortization on intangible assets $ 12.7 $ 4.6 $ 0.9