(Loss) Earnings Per Common Share - Diluted Earnings per Share for Class B Common Shares Using Two-Class Method (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Jan. 31, 2025	Jan. 31, 2024	Jan. 31, 2025	Jan. 31, 2024
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Undistributed and distributed earnings		$ (2,758)	$ 4,088	$ (2,723)	$ 9,199
Basic weighted average common shares outstanding (in shares)		33,680	33,292	33,507	33,842
Diluted EPS for class B common shares (in shares)		33,680	33,337	33,518	33,866
Basic EPS (in usd per share)	[1]	$ (0.08)	$ 0.12	$ (0.08)	$ 0.27
Class B Common Shares
Earnings Per Share, Diluted, by Common Class, Including Two Class Method [Line Items]
Undistributed and distributed earnings			$ 224	$ (63)	$ 495
Reallocation of undistributed earnings			0	0	0
Diluted EPS, Net earnings			$ 224	$ (63)	$ 495
Basic weighted average common shares outstanding (in shares)			1,822	786	1,822
Diluted EPS for class B common shares (in shares)			1,822	786	1,822
Basic EPS (in usd per share)			$ 0.12	$ (0.08)	$ 0.27
Diluted EPS (in usd per share)		$ 0.00	$ 0.12	$ (0.08)	$ 0.27

[1] Basic per share amounts are the same for Class A and Class B shares. Diluted per share amounts for Common Stock is shown above. Diluted earnings per share for Class B shares under the two-class method are $0.00 and $0.12 for the three months ended January 31, 2025 and 2024, and $(0.08) and $0.27 for the Nine months ended January 31, 2025 and 2024. See Note D to the condensed consolidated financial statements.