Earnings Per Common Share - Basic Earnings Per Common Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended
		Jul. 31, 2023	Jul. 31, 2022
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Total (in usd per share)	[1]	$ 0.08	$ 0.06
Basic weighted average common shares outstanding (in shares)		34,155	33,656
Class A Common Shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings (in usd per share)		$ 0.11	$ 0.11
Undistributed losses (in usd per share)		(0.03)	(0.05)
Total (in usd per share)		$ 0.08	$ 0.06
Distributed earnings		$ 3,558	$ 3,505
Undistributed losses		(956)	(1,488)
Total		$ 2,602	$ 2,017
Basic weighted average common shares outstanding (in shares)		32,333	31,834
Class B Common Shares
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Distributed earnings (in usd per share)		$ 0.11	$ 0.11
Undistributed losses (in usd per share)		(0.03)	(0.05)
Total (in usd per share)		$ 0.08	$ 0.06
Distributed earnings		$ 200	$ 201
Undistributed losses		(54)	(85)
Total		$ 146	$ 116
Basic weighted average common shares outstanding (in shares)		1,822	1,822

[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Class A shares are shown above. Diluted earnings per share for Class B shares under the two-class method are $0.08 and $0.06 for the three months ended July 31, 2023 and 2022, respectively. See Note D to the Condensed Consolidated Financial Statements.