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Fair Value of Financial Instruments - Additional Information (Detail) - USD ($) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Jun. 30, 2015 | Jun. 30, 2014 | [2] | Jun. 30, 2015 | Jun. 30, 2014 | [4] | Sep. 30, 2014
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Document Period End Date |  |  |  |  | Jun. 30, 2015 |  |  |
Percentage of male contractholder |  |  |  |  | 50.00% |  |  |
Percentage of female contractholder |  |  |  |  | 50.00% |  |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  | $ 0 |  |  | $ 0 |  |  |
Net transfer In (Out) of Level 3 (a) |  | 18,100,000 | [1] | $ (18,900,000) | (15,400,000) | [3] | $ (23,900,000) |
Asset Backed Securities and Corporate Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) | [4] |  |  |  | (34,500,000) |  |  |
Asset-backed Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Net transfer In (Out) of Level 3 (a) |  | (1,000,000) | [3] | $ (4,800,000) | (10,400,000) | [3] | $ (3,800,000) |
Fixed Maturities Available For Sale [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities |  | 17,723,600,000 |  |  | 17,723,600,000 |  |  | $ 17,211,500,000
Fixed Maturities Available For Sale [Member] | Asset-backed Securities [Member] |  |  |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |  |  |
Available-for-sale Securities, Debt Securities |  | $ 1,887,500,000 |  |  | $ 1,887,500,000 |  |  | $ 1,792,900,000
[1] | (a) During the three months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[2] | (a) The net transfers out of Level 3 for the three months ended June 30, 2014 were exclusively to Level 2.
[3] | (a) During the nine months ended June 30, 2015, the net transfers out of Level 3 were exclusively to Level 2 and the net transfer to Level 3 was related to a loan receivable previously eliminated upon consolidation.
[4] | (a) The net transfers out of Level 3 for the nine months ended June 30, 2014 were exclusively to Level 2. There was a $6.0 transfer to asset-backed securities from commercial mortgage-backed securities, the remaining transfers were from Level 3 to Level 2.

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