Employee Benefit and Retirement Plans (Reconciliation Of Benefit Obligations, Plan Assets, And Funded Status) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
Retirement Benefits [Abstract]
Projected benefit obligation at beginning of year	$ 196,537	$ 191,184
Interest cost	3,147	4,662	$ 5,974
Acturial (gains) and losses	(3,738)	6,759
Benefits paid	(4,214)	(6,068)
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement	191,732	0
Projected benefit obligation at end of year	0	196,537	191,184
Fair value of plan assets at beginning of year	193,552	190,743
Actual return on plan assets	3,373	8,877
Benefits paid	(4,214)	(6,068)
Defined Benefit Plan, Plan Assets, Payment for Settlement	191,732	0
Fair value of plan assets at end of year	979	193,552	$ 190,743
Funded status of the plan	$ 979	$ (2,985)