Income Taxes - Additional Information (Details) - USD ($)	12 Months Ended
	Apr. 30, 2021	Apr. 30, 2020	Apr. 30, 2019
Income Tax Contingency [Line Items]
Deferred tax assets valuation allowance	$ 241,000	$ 0
Effective tax rate	24.20%	10.80%	(8.40%)
Effective tax rate excluding impact of non-cash goodwill impairment charges		17.40%	45.60%
Undistributed earnings of foreign subsidiary	$ 171,000
Gross tax-effected unrecognized tax benefits	0	$ 0
Federal
Income Tax Contingency [Line Items]
Net operating loss carryforwards	0	0
Credits	0	0
State
Income Tax Contingency [Line Items]
Net operating loss carryforwards	0	0
Credits	$ 0	$ 0