CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Feb. 29, 2024	May 31, 2023	Feb. 28, 2023
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
Treasury stock (in shares)	15,100,000	12,900,000	11,500,000
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)	3,200,000	4,000,000.0	4,000,000.0
Common stock, shares issued (in shares)	800,000	1,700,000	1,700,000
Common stock, shares outstanding (in shares)	800,000	1,700,000	1,700,000
Common Class
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)	27,800,000	30,000,000.0	31,400,000