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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) | 3 Months Ended | 6 Months Ended
--- | --- | ---
Mar. 31, 2013 | Apr. 01, 2012 | Mar. 31, 2013 | Apr. 01, 2012
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Percentage of male contractholder |  |  |  | 50.00% |  |
Percentage of female contractholder |  |  |  | 50.00% |  |
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount |  | $ 0 |  |  | $ 0 |
Transfers, assets, level 2 to 1 | 0 | 0 |  | 0 | 0 |
Transfers, liabilities, level 1 to 2 | 0 | 0 |  | 0 | 0 |
Transfers, liabilities, level 2 to 1 | 0 | 0 |  | 0 | 0 |
Net transfer level 3 | 0 | 10,900,000 | [1] | 0 | 10,900,000 | [1]
Asset-backed and Hybrid Securities [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 | 38,900,000 |  |  | 53,000,000 |  |
Corporate and Non-Agency Residential Mortgage-Backed Securities [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |  |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Transfers out of Level 3 |  | $ 2,300,000 |  |  | $ 12,600,000 |
[1] | The net transfers in and out of Level 3 during the three and six months ended April 1, 2012 was exclusively to or from Level 2.

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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=7578670&loc=d3e19207-110258 + Details
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- Definition Transfers out of assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. + 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=7578670&loc=d3e19207-110258 + Details
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