Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Nov. 30, 2021	May 31, 2021
Statement of Financial Position [Abstract]
Trade accounts receivable, allowances	$ 50,932	$ 55,922
Preferred stock, par value	$ 0.01	$ 0.01
Preferred stock, authorized	50,000,000	50,000,000
Preferred stock, issued	0	0
Common stock, par value	$ 0.01	$ 0.01
Common stock, authorized	300,000,000	300,000,000
Common stock, issued	144,666,000	144,199,000
Common stock, outstanding	129,677,000	129,573,000