CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Nov. 30, 2023	May 31, 2023	Nov. 30, 2022
Preferred stock at par value per share (in dollars per share)	$ 1.00	$ 1.00	$ 1.00
Preferred stock, shares authorized (in shares)	2,000,000.0	2,000,000.0	2,000,000.0
Preferred stock, shares issued (in shares)	0	0	0
Preferred stock, shares outstanding (in shares)	0	0	0
Common Stock, par value per share (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	70,000,000.0	70,000,000.0	70,000,000.0
Common stock, shares issued (in shares)	42,900,000	42,900,000	42,900,000
Common stock, shares outstanding (in shares)	28,200,000	30,000,000.0	32,400,000
Treasury stock (in shares)	14,700,000	12,900,000	10,600,000
Common Class A
Common Stock, par value per share (in dollars per share)	$ 0.01	$ 0.01	$ 0.01
Common stock, shares authorized (in shares)	4,000,000.0	4,000,000.0	4,000,000.0
Common stock, shares issued (in shares)	1,700,000	1,700,000	1,700,000
Common stock, shares outstanding (in shares)	1,700,000	1,700,000	1,700,000