Fair Value of Financial Instruments - Summary of Financial Assets and Liabilities Measured at Fair Value on Recurring Basis - Additional Information (Detail) - USD ($) $ in Millions		Jun. 30, 2016	Jun. 30, 2015
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
MMDA account balances	[1]	$ 121.0	$ 65.5
MMDA Account [Member]
Fair Value Of Assets And Liabilities Measured On Non Recurring Basis [Line Items]
MMDA account balances		$ 91.0	$ 34.0

[1] Money market funds include MMDA account balances of $91.0 million and $34.0 million as of June 30, 2016 and 2015, respectively.