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Fair Value of Financial Instruments - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Percentage of male contract holder	50.00%
Percentage of female contract holder	50.00%
Asset Backed Securities Corporate Debt Securities Hybrids And Municipals [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net transfer out of Level 3 related to non-agency residential mortgage-backed securities and corporate securities	$ 794,012
Asset Backed Securities Corporate Debt Securities And Hybrid [Member]
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Net transfer out of Level 3 related to non-agency residential mortgage-backed securities and corporate securities		17,703
Net transfer in to Level 3 related to asset-backed securities, corporates and municipal securities	$ 3,712

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- Definition

Percentage of female contract holder.

+ References

No definition available.

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- Definition

Percentage of male contract holder.

+ References

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X

- Definition

Transfers into 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

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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

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