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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) | 12 Months Ended
--- | ---
Sep. 30, 2014 | Sep. 30, 2013 | Sep. 30, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Document Period End Date | Sep. 30, 2014 |  |  |  |
Impairment of proved oil and natural gas properties | $ 81,000,000 | $ 54,300,000 |  | $ 0 |
Percentage of female contractholder | 50.00% |  |  |  |
Percentage of male contractholder | 50.00% |  |  |  |
Fair Value Assets, level 1 to level 2 transfers | 0 | 0 |  | 0 |
Net transfer In (Out) of Level 3 (a) | (23,900,000) | (53,000,000) |  | (731,800,000) | [1]
Transfers, assets, level 2 to 1 | 0 | 0 |  |  |
Transfers, liabilities, level 1 to 2 | 0 | 0 |  |  |
Transfers, liabilities, level 2 to 1 | 0 | 0 |  |  |
Net transfer level 3 | 0 | 30,900,000 | [2] |  |
United States Government and government agencies and authorities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value Assets, level 1 to level 2 transfers | 79,300,000 |  |  |  |
Asset-backed and Hybrid Securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value Assets, unobservable inputs, transfers out of level 3 | 23,900,000 |  |  |  |
Corporate and Non-Agency Residential Mortgage-Backed Securities |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Fair Value Assets, unobservable inputs, transfers out of level 3 |  |  |  | (53,000,000) |
Commercial Mortgage Loan [Member] |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |
Loans Receivable, Fair Value Disclosure | $ 135,400,000 |  |  |  |
[1] | (a)The net transfers in and out of Level 3 during Fiscal 2012 was exclusively to or from Level 2.
[2] | (a)The net transfers in and out of Level 3 during Fiscal 2013 was exclusively to or from Level 2.

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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 Amount of transfers of assets measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 1 of the fair value hierarchy into Level 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of liabilities measured on a recurring basis out of Level 2 of the fair value hierarchy into Level 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (bb) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Glossary Loan -URI http://asc.fasb.org/extlink&oid=6517073 + Details
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