Income Taxes (Details) - USD ($)	6 Months Ended
	Oct. 31, 2021	Oct. 31, 2020	Apr. 30, 2021
Income Tax Disclosure [Abstract]
Effective income tax rate (as a percent)	24.40%	24.30%
Valuation allowance	$ 12,200,000		$ 11,800,000
Reserve for uncertain tax positions	$ 0		$ 0