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Employee Deferred Savings Plan - Company's Recorded Contributions To Plan (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2016
Dec. 31, 2015
Compensation and Retirement Disclosure [Abstract]        
Deferred savings plan contributions $ 1.4 $ 1.2 $ 3.0 $ 2.7