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Senior Notes - Additional Information (Detail) | Sep. 30, 2015 USD ($) | Sep. 30, 2014 USD ($) | Jul. 14, 2010 USD ($) Contract | May. 07, 2008 USD ($) Contract
--- | --- | --- | --- | ---
May 2008 senior notes |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors | $ 131,000,000 | $ 202,000,000 |  | $ 275,000,000
Number of series of Senior Notes issued | Contract |  |  |  | 4
Senior Notes issued in a private placement to a group of institutional investors, annual principal payment | 8,000,000 |  |  |
July 2010 senior notes |  |  |  |
Debt Disclosure [Line Items] |  |  |  |
Senior Notes issued in a private placement to a group of institutional investors | $ 245,000,000 | $ 245,000,000 | $ 245,000,000 |
Number of series of Senior Notes issued | Contract |  |  | 4 |

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