Retirement Plans (Details)	12 Months Ended
	Apr. 30, 2023
Supplemental Executive Retirement Plan
Defined Benefit Plan Disclosure [Line Items]
Term of supplemental retirement benefits	10 years
Minimum
Defined Benefit Plan Disclosure [Line Items]
Employee retirement age limit under retirement plans	60 years
Maximum
Defined Benefit Plan Disclosure [Line Items]
Employee retirement age limit under retirement plans	65 years