Shareholders' Equity - Additional Information (Details) $ / shares in Units, $ in Thousands	12 Months Ended			260 Months Ended
	Apr. 30, 2024 USD ($) plan $ / shares shares	Apr. 30, 2023 USD ($) $ / shares shares	Apr. 30, 2022 USD ($) $ / shares shares	Apr. 30, 2024 USD ($) plan $ / shares shares	Apr. 25, 2023 shares	Aug. 19, 2002 shares
Stock Based Compensation And Stockholders Equity [Line Items]
Number of stock option plans | plan	2			2
Weighted-average grant date fair value of stock options granted (in usd per share) | $ / shares	$ 3.85	$ 5.37	$ 6.86
Exercised (in shares) | shares	26,253	501,547	776,129
Total intrinsic value of options exercised	$ 0	$ 1,100	$ 10,000
Fair value of grants vested	5,100	$ 4,400	$ 2,800
Unrecognized compensation cost related to unvested stock option	$ 13,100			$ 13,100
Weighted average period for unrecognized compensation cost	1 year 7 months 20 days
Cost of common stock repurchased	$ 10,235
Shares Stock Repurchase Plan, August 19, 2002
Stock Based Compensation And Stockholders Equity [Line Items]
Approved number of shares to be repurchased (in shares) | shares						2,000,000
Cost of common stock repurchased	$ 10,200			16,400
All Share Repurchase Plans
Stock Based Compensation And Stockholders Equity [Line Items]
Cost of common stock repurchased				$ 35,800
Common stock shares repurchased (in shares) | shares				5,534,953
Restricted Stock Units (RSUs)
Stock Based Compensation And Stockholders Equity [Line Items]
Weighted average price, outstanding (in usd per share) | $ / shares	$ 11.82	$ 0	$ 0	$ 11.82
2020 Equity Compensation Plan
Stock Based Compensation And Stockholders Equity [Line Items]
Common stock reserved for future issuance (in shares) | shares					6,250,000
Options exercisable period, maximum	6 years
2020 Equity Compensation Plan | Restricted Stock Units (RSUs)
Stock Based Compensation And Stockholders Equity [Line Items]
Annual grant value	$ 120
2020 Equity Compensation Plan | Employee Stock Option
Stock Based Compensation And Stockholders Equity [Line Items]
Incentive and nonqualified options exercisable (in shares) | shares	2,725,704	1,818,957	1,315,604	2,725,704
Number of shares available for grant (in shares) | shares	248,930			248,930
Class A Common Shares
Stock Based Compensation And Stockholders Equity [Line Items]
Number of votes per share	0.10			0.10
Percentage of board of directors entitled to elect	25.00%
Ownership compared to both classes of common stock	10.00%			10.00%
Common stock dividends declared (in usd per share) | $ / shares	$ 0.05
Class B Common Shares
Stock Based Compensation And Stockholders Equity [Line Items]
Number of votes per share	1			1
Shareholder Holding More Than 10% of Outstanding Shares | 2020 Equity Compensation Plan
Stock Based Compensation And Stockholders Equity [Line Items]
Ownership compared to both classes of common stock	10.00%			10.00%
Options exercisable period, maximum	5 years