Valuation and Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	May 31, 2023	May 31, 2022	May 31, 2021
Allowance for deferred tax asset
Valuation and Qualifying Accounts
Balance at Beginning of Year	$ 20,203	$ 17,035	$ 13,114
Additions - Charged to costs and expenses	5,556	3,168	3,921
Deductions	0	0	0
Balance at End of Period	25,759	20,203	17,035
Allowance for sales returns and doubtful accounts
Valuation and Qualifying Accounts
Balance at Beginning of Year	1,939	1,919	2,150
Additions - Charged to costs and expenses	457	343	1,833
Deductions	(246)	(323)	(2,064)
Balance at End of Period	$ 2,150	$ 1,939	$ 1,919