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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2014 | Jun. 30, 2013 | Jun. 30, 2014 | Jun. 30, 2013
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Between Asset Classification | $ 6,000,000 |  |  |  | $ 6,000,000 |  |  |
Percentage of male contractholder |  |  |  |  | 50.00% |  |  |
Percentage of female contractholder |  |  |  |  | 50.00% |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount | 0 |  | 79,300,000 |  | 0 |  | 79,300,000 |
Net transfer In (Out) of Level 3 (a) | (18,900,000) | [1],[2] |  | [2] | (23,900,000) | [1],[2] | (53,000,000) | [2]
Asset-backed securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | $ (4,800,000) | [1] |  | [2] | $ (3,800,000) | [1] | $ (10,500,000) | [2]
[1] | This includes a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from level 3 to level 2.
[2] | (a)The net transfers in and out of Level 3 during the nine months ended June 30, 2013 were exclusively to or from Level 2.

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- Definition Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers Between Asset Classification + 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 transfer of financial instrument classified as an asset into (out of) level 3 of the fair value hierarchy. + References No definition available. + Details
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