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Investments - Schedule of Credit Quality of Asset-Based Loan Portfolio (Detail) (USD $) In Millions, unless otherwise specified | Mar. 31, 2013 | Sep. 30, 2012
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Asset-based loans, by credit quality rating |  |
Total asset-backed loans | $ 244.4 | $ 181.5
Total asset-backed loans, percent | 100.00% | 100.00%
Asset-based loans, by credit quality Rating 1 [Member] | Credit Rating AAA/AA/A [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | 18.0 | 75.8
Total asset-backed loans, percent | 7.40% | 41.70%
Asset-based loans, by credit quality Rating 2 [Member] | Credit Rating BBB [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | 200.2 | 94.9
Total asset-backed loans, percent | 81.90% | 52.30%
Asset-based loans, by credit quality Rating 3 [Member] | Credit Rating B [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans |  | 10.8
Total asset-backed loans, percent |  | 6.00%
Asset-based loans, by credit quality Rating 4 [Member] | Credit Rating B [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans |  |
Total asset-backed loans, percent |  |
Asset-based loans, by credit quality Rating 5 [Member] | Credit Rating CCC [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans | 26.2 |
Total asset-backed loans, percent | 10.70% |
Not Rated [Member] |  |
Asset-based loans, by credit quality rating |  |
Total asset-backed loans |  |
Total asset-backed loans, percent |  |

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- Details
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- Definition Asset Backed Loans And Other Invested Assets Gross + References No definition available. + Details
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- Definition Financing Receivable Credit Quality Percentage + References No definition available. + Details
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