CONDENSED CONSOLIDATED BALANCE SHEETS (Parentheticals) - $ / shares	Nov. 30, 2022	May 31, 2022	Nov. 30, 2021
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
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)	32,400,000	32,500,000	32,900,000
Treasury stock (in shares)	10,600,000	10,400,000	10,000,000.0
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