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Acquired Intangibles - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Goodwill And Intangible Assets Disclosure [Abstract]        
Acquired intangibles amortization $ 14.0 $ 17.7 $ 45.2 $ 55.6