Net Earnings Per Share (Schedule of Earnings Per Share, Basic and Diluted) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Jul. 31, 2024	Jul. 31, 2023
Earnings Per Share [Abstract]
Net income	$ 29,633	$ 37,850
Denominator for basic net earnings per common share - weighted-average shares	15,550,517	16,490,408
Effect of dilutive securities:
Stock options and restricted stock units	123,000	99,000
Diluted (in shares)	15,673,570	16,589,481
Earnings Per Share, Basic [Abstract]
Basic (in usd per share)	$ 1.91	$ 2.30
Earnings Per Share, Diluted [Abstract]
Diluted (in usd per share)	$ 1.89	$ 2.28
Stock excluded from the calculation of net earnings per share (shares)	0	0
Document Period End Date	Jul. 31, 2024