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Litigation And Other Related Contingencies (Details) $ in Thousands | 9 Months Ended |  |  |
--- | --- | --- | --- | ---
Jan. 31, 2018 USD ($) loan securities lawsuit | Apr. 30, 2017 USD ($) | Jan. 31, 2017 USD ($) | Apr. 30, 2016 USD ($)
Litigation And Related Contingencies [Abstract] |  |  |  |
Loss contingency accrual | $ 2,500 | $ 2,300 | $ 1,700 |
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 | $ 303,000 |  |  |
Scc |  |  |  |
Litigation And Related Contingencies [Abstract] |  |  |  |
Loss contingency accrual | 0 | $ 4,500 | $ 4,500 | $ 65,265
Loss Contingencies [Line Items] |  |  |  |
Original principal amount of loans securitized | 14,000,000 |  |  |
Scc | Claims with Knowledge of Outstanding Principal Amount |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Initial principal on loans securitized | $ 3,400,000 |  |  |
MGRID LLC v. Merrill Lynch Mortgage Lending Inc |  |  |  |
Loss Contingencies [Line Items] |  |  |  |
Number of lawsuits | lawsuit | 21 |  |  |

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