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Litigation And Other Related Contingencies (Details) $ in Thousands | 3 Months Ended |  |  |
--- | --- | --- | --- | ---
Jul. 31, 2017 USD ($) loan securities lawsuit | Apr. 30, 2017 USD ($) | Jul. 31, 2016 USD ($) | Apr. 30, 2016 USD ($)
Litigation And Related Contingencies [Abstract] |  |  |  |
Loss Contingency Accrual | $ 1,700 | $ 2,300 | $ 2,300 |
Number of loans sold to the trust | loan | 96 |  |  |
Loans Sold To Trust, With Claims of Breach of Contract and Indemnity | loan | 649 |  |  |
Loss Contingencies [Line Items] |  |  |  |
Securitization Transactions | securities | 39 |  |  |
Principal Assets of SCC | $ 315,000 |  |  |
SCC [Member] |  |  |  |
Litigation And Related Contingencies [Abstract] |  |  |  |
Loss Contingency Accrual | 4,500 | $ 4,500 | $ 25,500 | $ 65,265
Loss Contingencies [Line Items] |  |  |  |
Original Principal Amount of Loans Securitized | 14,000,000 |  |  |
SCC [Member] | Claims with Knowledge of Outstanding Principal Amount [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Initial principal on loans securitized | $ 3,600,000 |  |  |
MGRID LLC v. Merrill Lynch Mortgage Lending Inc [Member] |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number Of Lawsuits | lawsuit | 21 |  |  |

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