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Investments - Portfolio of Asset-Backed Loans and Other Invested Assets (Detail) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
--- | --- | ---
Jun. 30, 2013 | Sep. 30, 2012
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |
Document Period End Date | Jun. 30, 2013 |
Asset-backed loans, by major industry: |  |
Total asset-backed loans | $ 433.3 | $ 181.5
Less: Allowance for credit losses | 3.1 | 1.4
Total asset-backed loans, net | 430.2 | 180.1
Wholesale [Member] |  |
Asset-backed loans, by major industry: |  |
Total asset-backed loans | 23.0 | 77.2
Apparel [Member] |  |
Asset-backed loans, by major industry: |  |
Total asset-backed loans | 177.5 | 70.1
Jewelry [Member] |  |
Asset-backed loans, by major industry: |  |
Total asset-backed loans | 59.8 | 27.9
Other [Member] |  |
Asset-backed loans, by major industry: |  |
Total asset-backed loans | $ 173.0 | $ 6.3

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- Definition The end date of the period reflected on the cover page if a periodic report. For all other reports and registration statements containing historical data, it is the date up through which that historical data is presented. If there is no historical data in the report, use the filing date. The format of the date is CCYY-MM-DD. + References No definition available. + Details
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- Details
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