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Fair Value of Financial Instruments - Additional Information (Detail) $ in Millions | 3 Months Ended
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Dec. 31, 2015 USD ($)
Front Street Future Policyholder Benefits Reserve [Member] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |
Change In Fair Value Of Derivatives | $ 7.0

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- Definition Change in fair value of derivatives. + References No definition available. + Details
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Balance Type: | credit
Period Type: | duration

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |