Stock Repurchases (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended	257 Months Ended
	Jan. 31, 2024	Jan. 31, 2024	Jan. 31, 2024	Aug. 19, 2002
Equity, Class of Treasury Stock [Line Items]
Cost of common stock repurchased	$ 5,421	$ 10,235
Class A Common Shares
Equity, Class of Treasury Stock [Line Items]
Cost of common stock repurchased		$ 35,800
Common stock shares repurchased (in shares)		5,534,953
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
Cost of common stock repurchased		$ 10,200	$ 16,400
Common stock shares repurchased (in shares)			2,000,000