v3.26.1
Stock-Based Compensation Plans (Other Information Pertaining to Performance-Based RSUs and RSAs) (Details) - Performance-Based RSUs and RSAs [Member] - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
May 31, 2026
May 31, 2025
May 31, 2024
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]      
Weighted-average grant-date fair value per share $ 139.40 $ 125.17 $ 114.23
Total grant-date fair value of shares vested $ 11.2 $ 14.6 $ 0.4