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Basis of Presentation - Additional Information (Detail) - Forward Contracts [Member] $ in Millions, ¥ in Billions	3 Months Ended		6 Months Ended
	Dec. 31, 2015 USD ($) ¥ / $	Dec. 31, 2014 USD ($)	Dec. 31, 2015 USD ($) ¥ / $	Dec. 31, 2014 USD ($)	Dec. 31, 2015 JPY (¥) ¥ / $
Basis Of Presentation [Line Items]
Net gain (loss) on foreign currency transactions	$ 0.1	$ 15.1	$ (3.0)	$ 14.9
Foreign currency forward contracts outstanding amount	$ 60.5		$ 60.5		¥ 7.3
Average exchange rate of foreign currency forward contracts | ¥ / $	120.51		120.51		120.51
Foreign currency transaction gain (loss) unrealized	$ (0.4)		$ 1.2

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