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Fair Value of Financial Instruments - Schedule of Unobservable Inputs Used for Level Three Fair Value Measurements of Financial Instruments on Recurring Basis (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 30, 2012 | Sep. 30, 2012
Assets |  |
Assets | 313.5 | 206.0
Assets | 313.5 | 206.0
Liabilities | 1,680.1 | 1,782.8
Asset-backed securities [Member] |  |
Assets |  |
Assets | 5.3 | 15.9
Assets | 5.3 | 15.9
Commercial mortgage-backed securities [Member] |  |
Assets |  |
Assets | 6.1 | 5.0
Assets | 6.1 | 5.0
Corporates [Member] |  |
Assets |  |
Assets | 32.7 | 32.0
Assets | 32.7 | 32.0
Hybrids [Member] |  |
Assets |  |
Assets | 5.0 |
Assets | 5.0 |
Broker-quoted [Member] | Asset-backed securities [Member] |  |
Assets |  |
Valuation Technique | Broker-quoted |
Broker-quoted [Member] | Commercial mortgage-backed securities [Member] |  |
Assets |  |
Valuation Technique | Market pricing |
Broker-quoted [Member] | Corporates [Member] |  |
Assets |  |
Valuation Technique | Broker-quoted |
Broker-quoted [Member] | Hybrids [Member] |  |
Assets |  |
Valuation Technique | Market pricing |
Market pricing [Member] | Corporates [Member] |  |
Assets |  |
Assets | 223.4 | 103.3
Assets | 223.4 | 103.3
Valuation Technique | Broker-quoted |
Market pricing [Member] | Hybrids [Member] |  |
Assets |  |
Assets |  | 8.8
Assets |  | 8.8
Valuation Technique | Broker-quoted |
Contingent purchase price reduction receivable [Member] |  |
Assets |  |
Assets | 41.0 | 41.0
Assets | 41.0 | 41.0
Contingent purchase price reduction receivable [Member] | Discounted cash flow [Member] |  |
Assets |  |
Valuation Technique | Discounted cash flow |
FIA embedded derivatives, included in contractholder funds [Member] |  |
Assets |  |
Liabilities | 1,517.0 | 1,550.8
FIA embedded derivatives, included in contractholder funds [Member] | Discounted cash flow [Member] |  |
Assets |  |
Valuation Technique | Discounted cash flow |
Equity conversion feature of preferred stock [Member] |  |
Assets |  |
Liabilities | 163.1 | 232.0
Equity conversion feature of preferred stock [Member] | Monte Carlo simulation / Option model [Member] |  |
Assets |  |
Valuation Technique | Monte Carlo simulation / Option model |
Minimum [Member] | Asset-backed securities [Member] |  |
Assets |  |
Offered quotes |  | 100.00%
Minimum [Member] | Corporates [Member] |  |
Assets |  |
Quoted prices | 0.00% | 0.00%
Offered quotes | 88.00% | 88.00%
Minimum [Member] | Hybrids [Member] |  |
Assets |  |
Quoted prices |  | 0.00%
Minimum [Member] | Contingent purchase price reduction receivable [Member] |  |
Assets |  |
Probability of collection | 88.00% | 88.00%
Minimum [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |
Assets |  |
Market value of option | 0.00% | 0.00%
SWAP rates | 0.86% | 0.76%
Surrender rates | 0.50% | 2.00%
Non-performance spread | 0.25% | 0.25%
Minimum [Member] | Equity conversion feature of preferred stock [Member] |  |
Assets |  |
Annualized volatility of equity | 44.00% | 41.00%
Discount yield | 11.00% | 12.00%
Calibration adjustment | 17.00% | 10.00%
Maximum [Member] | Asset-backed securities [Member] |  |
Assets |  |
Offered quotes | 109.00% | 110.00%
Maximum [Member] | Commercial mortgage-backed securities [Member] |  |
Assets |  |
Offered quotes |  | 101.00%
Maximum [Member] | Corporates [Member] |  |
Assets |  |
Quoted prices | 149.00% | 141.00%
Offered quotes | 149.00% | 158.00%
Maximum [Member] | Hybrids [Member] |  |
Assets |  |
Quoted prices |  | 103.00%
Maximum [Member] | Contingent purchase price reduction receivable [Member] |  |
Assets |  |
Probability of collection | 96.00% | 96.00%
Expected term | 9 months | 9 months
Discount rate | 0.62% | 0.72%
Credit insurance risk premium | 12.00% | 12.00%
Maximum [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |
Assets |  |
Market value of option | 30.00% | 31.00%
SWAP rates | 2.00% | 2.00%
Mortality multiplier | 80.00% | 70.00%
Surrender rates | 75.00% | 50.00%
Non-performance spread | 0.25% | 0.25%
Maximum [Member] | Equity conversion feature of preferred stock [Member] |  |
Assets |  |
Discount yield |  | 13.00%
Non-cash accretion rate | 0.00% | 0.00%
Calibration adjustment | 19.00% | 13.00%
Weighted average [Member] | Asset-backed securities [Member] |  |
Assets |  |
Offered quotes |  | 103.00%
Weighted average [Member] | Commercial mortgage-backed securities [Member] |  |
Assets |  |
Offered quotes | 102.00% |
Weighted average [Member] | Corporates [Member] |  |
Assets |  |
Quoted prices | 80.00% | 69.00%
Offered quotes | 95.00% | 98.00%
Weighted average [Member] | Hybrids [Member] |  |
Assets |  |
Quoted prices |  | 25.00%
Offered quotes | 100.00% |
Weighted average [Member] | Contingent purchase price reduction receivable [Member] |  |
Assets |  |
Probability of collection | 92.00% | 92.00%
Weighted average [Member] | FIA embedded derivatives, included in contractholder funds [Member] |  |
Assets |  |
Market value of option | 2.00% | 4.00%
SWAP rates | 1.00% | 1.00%
Surrender rates | 7.00% | 7.00%
Non-performance spread | 0.25% | 0.25%
Weighted average [Member] | Equity conversion feature of preferred stock [Member] |  |
Assets |  |
Discount yield |  | 12.00%
Calibration adjustment | 18.00% | 11.00%

X
- Definition Fair value inputs market value of option. + References No definition available. + Details
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- Definition Fair value measurements annualized volatility of equity. + References No definition available. + Details
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- Definition Fair value measurements calibration adjustment. + References No definition available. + Details
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- Definition Credit insurance risk premium. + References No definition available. + Details
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- Definition Discount yield. + References No definition available. + Details
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- Definition Mortality multiplier. + References No definition available. + Details
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- Definition Non-cash accretion rate. + References No definition available. + Details
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- Definition Non-performance spread. + References No definition available. + Details
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- Definition Offered quotes. + References No definition available. + Details
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- Definition Fair value measurements probability of collection. + References No definition available. + Details
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- Definition Fair value measurements quoted prices. + References No definition available. + Details
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- Definition Surrender rates. + References No definition available. + Details
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- Definition Fair value measurements swap rates. + References No definition available. + Details
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- Definition This element represents the aggregate of the assets reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Period the instrument, asset or liability is expected to be outstanding, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days. + 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 (e) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Interest rate used to find the present value of an amount to be paid or received in the future as an input to measure fair value. For example, but not limited to, weighted average cost of capital (WACC), cost of capital, cost of equity and cost of debt. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Description of the inputs and valuation technique(s) used to measure fair value. + 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 (bbb) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition This element represents the aggregate of the liabilities reported on the balance sheet at period end measured at fair value by the entity. This element is intended to be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. + 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 (a) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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