Income Taxes income Taxes (Change in Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022
Change in Unrecognized Tax Benefits
Balance at beginning of year	$ 2,070	$ 1,491
Additions based on tax positions related to the current year	0	49
Additions based on tax positions of prior years	1,568	1,286
Statute of limitations lapses	0	(756)
Reductions for tax positions of prior years settlements	(746)	0
Balance at end of year	$ 2,892	$ 2,070