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Goodwill and Intangible Assets - Amortization on Intangible Assets (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Goodwill And Intangible Assets Disclosure [Abstract]      
Amortization of intangible assets $ 37.3 $ 33.3 $ 12.7