Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
Allowances for Accounts Receivable
Allowance Rollforward
Balance at beginning of period	$ (9,346)	$ (6,282)	$ (5,141)
Provision / Additions charged to costs and expenses	(6,135)	(1,588)	(1,774)
Charged to other accounts	(1,971)	(2,714)	(477)
Deductions	3,816	1,238	1,110
Balance at end of period	(13,636)	(9,346)	(6,282)
Valuation Allowance on Deferred Tax Assets
Allowance Rollforward
Balance at beginning of period	(11,719)	(11,768)	(10,183)
Provision / Additions charged to costs and expenses	(443)	(1,248)	(1,585)
Deductions	454	1,297	0
Balance at end of period	$ (11,708)	$ (11,719)	$ (11,768)