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