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, 2025	Apr. 30, 2024	Apr. 30, 2023
Earnings Per Share [Abstract]
Net income	$ 99,456	$ 116,216	$ 93,723
Denominator for basic earnings per common share - weighted-average shares	15,190	16,139	16,614
Stock options and restricted stock units	109	121	71
Denominator for diluted earnings (loss) per common share - weighted-average shares and assumed conversions	15,299	16,260	16,685
Net earnings (loss) per share, Basic (usd per share)	$ 6.55	$ 7.20	$ 5.64
Net earnings (loss) per share, Diluted (usd per share)	$ 6.50	$ 7.15	$ 5.62