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Loss Contingencies Arising From Representations and Warranties of Our Discontinued Mortgage Operations (Narrative) (Details) $ in Thousands | 12 Months Ended | 35 Months Ended | 36 Months Ended | 60 Months Ended | 108 Months Ended |
--- | --- | --- | --- | --- | --- | ---
Apr. 30, 2018 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2016 USD ($) | Nov. 30, 2007 item | Apr. 30, 2007 | Apr. 30, 2013 USD ($) | Apr. 30, 2017 USD ($) | Apr. 30, 2015 USD ($)
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Percentage of fraud on originated loans |  |  |  |  | 68.00% |  |  |
Claims received for loans |  |  |  |  |  |  | $ 2,600,000 |
Document Fiscal Year Focus | 2018 |  |  |  |  |  |  |
Principal Assets of SCC | $ 300,000 |  |  |  |  |  |  |
Securitization transactions | item |  |  |  | 39 |  |  |  |
SCC |  |  |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |  |  |
Claims received for loans |  |  |  |  |  | $ 1,900,000 |  |
Loss Contingency Accrual, Payments | 4,500 | $ 61,000 | $ 88,500 |  |  |  |  |
Accrued liability | $ 0 | $ 4,500 | $ 65,265 |  |  |  | $ 4,500 | $ 149,765

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