Commitments And Contingencies (Narrative) (Details)	12 Months Ended
	Apr. 30, 2020 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2020 CAD ($)
Commitments and Contingencies Disclosure [Abstract]
POM Maximum per Tax Return	$ 10,000
Standard guarantee accrual amount	9,400,000	$ 9,900,000
Contingent business acquisition obligation	14,200,000	11,100,000
Commitments And Contingencies [Line Items]
Lines of credit, total obligation	41,000,000.0
Remaining franchise equity lines of credit-undrawn commitment	26,000,000.0
Obligation under deferred compensation plans	$ 15,100,000	19,900,000
Percentage of participation interest, at par	90.00%
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
SCC
Commitments And Contingencies [Line Items]
Loss contingency accrual		0
Axos | Financial Guarantee | Refund Advance
Commitments And Contingencies [Line Items]
Limited guarantee (up to)	7,500,000
Loss contingency accrual	2,500,000	1,600,000
Amount paid		$ 1,500,000
Estimate of possible loss	57,000,000
Loans Prior To IRS Acceptance | Axos | Financial Guarantee | Refund Advance
Commitments And Contingencies [Line Items]
Loss contingency accrual	$ 2,900,000