Earnings Per Share (Schedule Of Earnings (Loss) Per Share, Basic And Diluted) (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Apr. 30, 2024	Apr. 30, 2023	Apr. 30, 2022
Earnings Per Share [Abstract]
Net income (loss)	$ 116,216	$ 93,723	$ (29,722)
Denominator for basic earnings per common share - weighted-average shares	16,139	16,614	16,592
Stock options and restricted stock units	121	71	0
Denominator for diluted earnings (loss) per common share - weighted-average shares and assumed conversions	16,260	16,685	16,592
Net earnings (loss) per share, Basic (usd per share)	$ 7.20	$ 5.64	$ (1.79)
Net earnings (loss) per share, Diluted (usd per share)	$ 7.15	$ 5.62	$ (1.79)