Summary of Business and Significant Accounting Policies (Details)	12 Months Ended
	Apr. 30, 2025 USD ($) operating_segment	Apr. 30, 2024 USD ($)	Apr. 30, 2023 USD ($)
Subsidiary, Sale of Stock [Line Items]
Restricted cash	$ 12,600,000	$ 12,600,000
Allowance for doubtful accounts	900,000	400,000
Unbilled receivables	40,200,000	62,300,000
Long-lived assets, impairment	0	0	$ 0
Goodwill, impairment	0	0	0
Capitalized software costs	4,300,000	4,300,000
Amortized capitalized software costs	$ 400,000	1,300,000	1,100,000
Term of pilot phase, up to (in months)	6 months
Deferred costs, sales commissions, amortization period (in years)	5 years
Accrued liabilities, warranties	$ 0	0
Advertising expenses	18,300,000	15,800,000	6,900,000
401(k) matching contributions	$ 0	$ 0	$ 0
Number of operating segments | operating_segment	1
Minimum
Subsidiary, Sale of Stock [Line Items]
Property and equipment, useful life (in years)	3 years
Maximum
Subsidiary, Sale of Stock [Line Items]
Property and equipment, useful life (in years)	5 years