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Employee Deferred Savings Plan - Company's Recorded Contributions To Plan (Detail) - USD ($)
$ in Millions
12 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2015
Compensation And Retirement Disclosure [Abstract]      
Deferred savings plan Company contributions $ 6.6 $ 5.5 $ 5.1