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Segment Data - Additional Information (Detail) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2015 USD ($) | Jun. 30, 2014 USD ($) | Jun. 30, 2015 USD ($) Segment | Jun. 30, 2014 USD ($)
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges | $ 113.9 | $ (0.3) | $ 613.4 | $ 82.5
Number of reporting segments |  |  | 4 |
Insurance Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges | $ 16.2 |  | $ 58.6 |
Asset Management segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | 72.2 |
Radioshack [Member] | Insurance Segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | 40.0 |
Radioshack [Member] | Asset Management segment [Member] |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Asset Impairment Charges |  |  | $ 24.8 |

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- Definition Amount of write-down of assets recognized in the income statement. Includes, but is not limited to, losses from tangible assets, intangible assets and goodwill. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 360 -SubTopic 10 -Section 45 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=51824106&loc=d3e2420-110228 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 28 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3602-108585 + Details
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