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Commitments And Contingencies (Narrative) (Details) | 12 Months Ended |  |
--- | --- | --- | ---
Apr. 30, 2021 USD ($) | Apr. 30, 2021 CAD ($) | Apr. 30, 2020 USD ($)
Commitments and Contingencies Disclosure [Abstract] |  |  |
POM Maximum per Tax Return | $ 10,000 |  |
Standard guarantee accrual amount | 12,200,000 |  | $ 9,400,000
Contingent business acquisition obligation | 17,600,000 |  | 14,200,000
Commitments And Contingencies [Line Items] |  |  |
Lines of credit, total obligation | 14,200,000 |  |
Remaining franchise equity lines of credit-undrawn commitment | 6,100,000 |  |
Obligation under deferred compensation plans | $ 15,000,000.0 |  | 15,100,000
Percentage of participation interest, at par | 90.00% |  |
Contingent business acquisition obligation | $ 17,600,000 |  | 14,200,000
Social security tax, employer subsidy received, COVID 19 | 15,900,000 |  |
U.S. clients |  |  |
Commitments And Contingencies [Line Items] |  |  |
Additional tax assessment limit per client | 6,000 |  |
Canadian clients |  |  |
Commitments And Contingencies [Line Items] |  |  |
Additional tax assessment limit per client |  | $ 3,000 |
Axos |  |  |
Commitments And Contingencies [Line Items] |  |  |
Loss contingency accrual |  |  | $ 5,400,000
Loss contingency accrual, payments | 2,100,000 |  |
Axos | Financial Guarantee | Refund Advance |  |  |
Commitments And Contingencies [Line Items] |  |  |
Limited guarantee (up to) | 18,000,000.0 |  |
Loss contingency accrual | $ 2,600,000 |  |

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