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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) | 12 Months Ended
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Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair Value Assets, level 1 to level 2 transfers | $ 0 |  |  |  | $ 0 |
Net transfer In (Out) of Level 3 (a) | 5,200,000 | [1] | $ 19,100,000 | [2] | 0 |
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 | [1]
Asset Backed Securities and Corporate Securities [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Available-for-sale Securities, Amortized Cost Basis | 15,500,000 |  | 4,800,000 |  | 13,100,000 |
Available-for-sale Securities | $ 8,100,000 |  | $ 2,500,000 |  | $ 10,100,000 |
Front Street Future Policyholder Benefits Reserve [Member] | Minimum [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Risk margin for uncertainty |  |  | 0.50% |  |  |
Front Street Future Policyholder Benefits Reserve [Member] | Maximum |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Risk margin for uncertainty |  |  | 1.00% |  |  |
[1] | (a) During Fiscal 2016, the net transfer to Level 3 was exclusively from Level 2. The transfers into Level 3 were related to changes in the primary pricing source and changes in the observability of external information used in determining the fair value.
[2] | (a) During Fiscal 2015, the net transfer to Level 3 was related to a loan receivable previously classified as a related party loan.

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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=66048111&loc=d3e19207-110258 + Details
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