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Litigation And Related Contingencies (Details) $ in Millions | 12 Months Ended | 35 Months Ended |
--- | --- | --- | ---
Apr. 30, 2018 USD ($) lawsuit | Nov. 30, 2007 item | Apr. 30, 2017 USD ($)
Loss Contingencies [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
Accrued obligations under indemnifications | $ 2.7 |  | $ 2.3
Document Period End Date | Apr. 30, 2018 |  |
Number of lawsuits | lawsuit | 21 |  |
Securitization transactions | item |  | 39 |
Principal Assets of SCC | $ 300.0 |  |
Pending Litigation |  |  |
Loss Contingencies [Line Items] |  |  |
Initial principal on loans securitized | 14,000.0 |  |
Principal outstanding on loans securitized | $ 3,400.0 |  |

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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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- Definition Amount of loss contingency liability expected to be resolved after one year or beyond the normal operating cycle, if longer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14326-108349 + Details
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