Property and Equipment (Details) - USD ($) $ in Thousands	Apr. 30, 2023	Apr. 30, 2022
Property, Plant and Equipment [Line Items]
Gross property plant and equipment	$ 38,815	$ 34,894
Accumulated depreciation and amortization	(32,371)	(31,240)
Net property plant and equipment	6,444	3,654
Buildings and leasehold improvements
Property, Plant and Equipment [Line Items]
Gross property plant and equipment	19,714	17,448
Computer equipment and purchased software
Property, Plant and Equipment [Line Items]
Gross property plant and equipment	13,788	12,443
Office furniture and equipment
Property, Plant and Equipment [Line Items]
Gross property plant and equipment	$ 5,312	$ 5,003