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Loss Contingencies Arising From Representations And Warranties of Our Discontinued Mortgage Operations (Contingency Rollforward) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Apr. 30, 2018 | Apr. 30, 2017 | Apr. 30, 2016
Loss Contingencies [Line Items] |  |  |
Document Fiscal Year Focus | 2018 |  |
SCC |  |  |
Loss Contingency Accrual [Roll Forward] |  |  |
Balance, beginning of the year | $ 4,500 | $ 65,265 | $ 149,765
Loss provisions | 0 | 235 | 4,000
Payments | (4,500) | (61,000) | (88,500)
Balance, end of the year | $ 0 | $ 4,500 | $ 65,265

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