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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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