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Employee Deferred Savings Plan - Company's Recorded Contributions To Plan (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Compensation And Retirement Disclosure [Abstract]        
Deferred savings plan contributions $ 1.8 $ 1.4 $ 4.8 $ 4.1