Commitments And Contingencies (Narrative) (Details) - USD ($)	12 Months Ended
	Apr. 30, 2019	Apr. 30, 2018	Apr. 30, 2017
Commitments and Contingencies Disclosure [Abstract]
POM Maximum per Tax Return	$ 10,000
Standard guarantee accrual amount	9,900,000	$ 9,400,000
Contingent business acquisition obligation	11,100,000	12,100,000
Commitments And Contingencies [Line Items]
Lines of credit, total obligation	30,400,000
Remaining franchise equity lines of credit-undrawn commitment	13,100,000
Obligation under deferred compensation plans	$ 19,900,000	23,300,000
Percentage of participation interest, at par	90.00%
Rent expense	$ 255,000,000	245,900,000	$ 236,200,000
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
SCC
Commitments And Contingencies [Line Items]
Loss contingency accrual	0	0
Axos | Financial Guarantee | Refund Advance
Commitments And Contingencies [Line Items]
Limited guarantee (up to)	7,500,000.0
Loss contingency accrual	1,600,000	1,600,000
Amount paid		$ 1,500,000
Estimate of possible loss	$ 57,000,000
Average
Commitments And Contingencies [Line Items]
Term of operating leases, years	4 years