Stock Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended	254 Months Ended
	Oct. 31, 2023	Oct. 31, 2023	Oct. 31, 2023	Aug. 19, 2002
Equity, Class of Treasury Stock [Line Items]
Cost of common stock repurchased	$ 4,814	$ 4,814
Class A Common Shares
Equity, Class of Treasury Stock [Line Items]
Common stock shares repurchased (in shares)		5,019,208
Cost of common stock repurchased		$ 30,400
Shares Stock Repurchase Plan, August 19, 2002 | Class A Common Shares
Equity, Class of Treasury Stock [Line Items]
Approved number of shares to be repurchased (in shares)				2,000,000
Common stock shares repurchased (in shares)			1,484,255
Cost of common stock repurchased		$ 4,800	$ 11,000