Presentation and Summary of Significant Accounting Policies - Additional Information (Details)	12 Months Ended
	Apr. 30, 2023 USD ($) segment group plan $ / shares	Apr. 30, 2022 USD ($)	Apr. 30, 2021 USD ($)
Accounting Policies [Line Items]
Number of reportable segments | segment	3
Number of major product and service groups | group	6
Number of major business segments | segment	3
Amounts received for reimbursement of travel and other out-of-pocket expenses	$ 328,000	$ 171,000	$ 26,000
Revenue recognized and included in deferred revenue	41,000,000
Remaining performance obligations	124,000,000
Deferred commissions	3,000,000	3,400,000
Amortization of sales commissions	1,700,000	2,100,000	2,000,000
Impairment loss	0	0	0
Unbilled license fees	300,000	1,000,000
Unbilled services revenue	2,300,000	2,000,000
Cash equivalents	81,400,000	98,500,000
Total amounts of expense/(recovery) to operations for doubtful accounts	0	0	0
Depreciation and amortization expense	1,200,000	700,000	600,000
Amortization of acquisition-related intangibles	$ 106,000	212,000	212,000
Number of stock compensation plans | plan	1
Stock-based compensation expense	$ 5,183,000	3,956,000	2,546,000
Income tax benefit (shortfall)	$ 70,000	1,700,000	600,000
Share conversion ratio	1
Advertising expense	$ 2,700,000	3,000,000	2,100,000
Liability for warranty agreements	$ 0	0
Class A Common Shares
Accounting Policies [Line Items]
Dividends preference (in usd per share) | $ / shares	$ 0.05
Operating Expense
Accounting Policies [Line Items]
Amortization of acquisition-related intangibles	$ 100,000	$ 200,000	200,000
Subscription Fees
Accounting Policies [Line Items]
Amortization of acquisition-related intangibles	$ 700,000
Cost of License Fees
Accounting Policies [Line Items]
Amortization of acquisition-related intangibles			600,000
Capitalized Software
Accounting Policies [Line Items]
Intangible assets amortized period (in years)	3 years
Finite-Lived Intangible Assets
Accounting Policies [Line Items]
Amortization of acquisition-related intangibles	$ 800,000		$ 800,000
Computers Equipment And Software
Accounting Policies [Line Items]
Estimated useful lives of assets	3 years
Office furniture and equipment
Accounting Policies [Line Items]
Estimated useful lives of assets	7 years
Buildings and leasehold improvements
Accounting Policies [Line Items]
Estimated useful lives of assets	15 years
Buildings
Accounting Policies [Line Items]
Estimated useful lives of assets	30 years
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction, Start Date [Axis]: 2023-05-01
Accounting Policies [Line Items]
Revenue recognition of remaining performance obligations	52.00%
Revenue recognition in next twelve months	12 months
Minimum
Accounting Policies [Line Items]
Contractual period of maintenance contract	1 year
Minimum | Other Intangible Assets
Accounting Policies [Line Items]
Intangible assets amortized period (in years)	1 year
Maximum
Accounting Policies [Line Items]
Contractual period of maintenance contract	3 years
Maximum | Other Intangible Assets
Accounting Policies [Line Items]
Intangible assets amortized period (in years)	8 years