Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2023	Apr. 30, 2022	Apr. 30, 2021
SEC Schedule, 12-09, Allowance, Credit Loss [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	$ 226	$ 331	$ 472
Additions (Reductions) Charged to Cost and Expenses	420	78	182
Other	0	0	0
Deductions	(197)	(183)	(323)
Balance at End of Year	449	226	331
Reserve for Cash Discounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,973	1,836	1,171
Additions (Reductions) Charged to Cost and Expenses	21,540	21,486	19,109
Other	0	0	0
Deductions	(21,760)	(21,349)	(18,444)
Balance at End of Year	1,753	1,973	1,836
Reserve for Sales Returns and Allowances [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	9,539	7,154	4,541
Additions (Reductions) Charged to Cost and Expenses	26,043	30,088	22,298
Other	0	0	0
Deductions	(26,292)	(27,703)	(19,685)
Balance at End of Year	$ 9,290	$ 9,539	$ 7,154