Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	May 31, 2024	May 31, 2023	May 31, 2022
Statement of Financial Position [Abstract]
Receivables, allowances	$ 343	$ 803
Other intangible assets, accumulated amortization	$ 83,242	$ 73,308
Preferred shares, without par value
Preferred shares, shares authorized	1,000,000	1,000,000
Preferred shares, shares issued	0	0
Preferred shares, shares outstanding	0	0
Common stock, without par value
Common shares, authorized	150,000,000	150,000,000
Common shares, shares issued	49,512,937	48,659,323
Common shares, shares outstanding	49,512,937	48,659,323
Accumulated other comprehensive income (loss), taxes	$ (911)	$ (5)