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Investments - Other-than-Temporary Impairments (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Dec. 31, 2013 | Dec. 31, 2012
Document Period End Date | Dec. 31, 2013 |
Change-of-intent, and non-credit losses in other comprehensive income |  | $ 1.5

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Definition Non Credit Related Losses Recognized In Other Comprehensive Income + References No definition available. + Details
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