Earnings Per Common Share - Diluted Earnings per Share for Class A Common Shares Using If-Converted Method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Jan. 31, 2024	Jan. 31, 2023	Jan. 31, 2024	Jan. 31, 2023
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Basic weighted average common shares outstanding (in shares)		33,292	33,759	33,842	33,711
Class A common shares diluted (in shares)		33,337	33,965	33,866	34,006
Basic EPS (in usd per share)	[1]	$ 0.12	$ 0.09	$ 0.27	$ 0.22
Diluted EPS (in usd per share)	[1]	$ 0.12	$ 0.09	$ 0.27	$ 0.22
Class A Common Shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Undistributed and distributed earnings		$ 3,864	$ 3,043	$ 8,704	$ 6,987
Undistributed and distributed earnings, class B conversion		224	174	495	399
Diluted EPS, Net earnings		$ 4,088	$ 3,217	$ 9,199	$ 7,386
Basic weighted average common shares outstanding (in shares)		31,470	31,937	32,020	31,890
Common stock equivalents (in shares)		44	206	24	294
Weighted average shares including common stock equivalents, diluted (in shares)		31,514	32,143	32,044	32,184
Class B common share conversion (in shares)		1,822	1,822	1,822	1,822
Class A common shares diluted (in shares)		33,336	33,965	33,866	34,006
Basic EPS (in usd per share)		$ 0.12	$ 0.09	$ 0.27	$ 0.22
Diluted EPS (in usd per share)		$ 0.12	$ 0.09	$ 0.27	$ 0.22

[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 $0.12 and $0.09 for the three months ended January 31, 2024 and 2023, and $0.27 and $0.22 for the nine months ended January 31, 2024 and 2023. See Note D to the condensed consolidated financial statements.