Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Apr. 30, 2022	Apr. 30, 2021	Apr. 30, 2020
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	$ 331	$ 472	$ 249
Additions (Reductions) Charged to Cost and Expenses	78	182	323
Other	0	0	0
Deductions	(183)	(323)	(100)
Balance at End of Year	226	331	472
Reserve for Cash Discounts [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	1,836	1,171	1,451
Additions (Reductions) Charged to Cost and Expenses	21,486	19,109	16,810
Other	0	0	0
Deductions	(21,349)	(18,444)	(17,090)
Balance at End of Year	1,973	1,836	1,171
Reserve for Sales Returns and Allowances [Member]
SEC Schedule, 12-09, Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at Beginning of Year	7,154	4,541	4,545
Additions (Reductions) Charged to Cost and Expenses	30,088	22,298	17,049
Other	0	0	0
Deductions	(27,703)	(19,685)	(17,053)
Balance at End of Year	$ 9,539	$ 7,154	$ 4,541