Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Aug. 31, 2023	May 31, 2023
Condensed Consolidated Balance Sheets
Accounts receivable, allowances	$ 14.1	$ 13.4
Property, plant, and equipment, net of accumulated depreciation	272.8	268.8
Intangible assets, net of accumulated amortization	$ 7.1	$ 6.0
Preferred stock, par value (in dollars per share)	$ 1.00	$ 1.00
Preferred stock, shares authorized	250,000	250,000
Preferred stock, shares issued	0	0
Common stock, par value (in dollars per share)	$ 1.00	$ 1.00
Common stock, shares authorized	100,000,000	100,000,000
Common stock, shares issued	45,300,786	45,300,786
Treasury stock, shares issued	10,005,789	10,385,237