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Capital Stock and Stock-Based Awards - Schedule of stock option activity for the Class A Stock and Common Stock plans (Details)
$ / shares in Units, $ in Millions
 12 Months Ended
May 31, 2025
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Beginning balance, Outstanding (in shares) | shares 2,942,293
Granted (Shares) | shares 16,773
Exercised (Shares) | shares (64,050)
Expired, cancellations and forfeited (Shares) | shares (231,218)
Ending balance, Outstanding (in shares) | shares 2,663,798
Exercisable (Shares) at May 31, 2016 | shares 2,398,086
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price [Abstract]  
Beginning balance, Outstanding (in dollars per share) | $ / shares $ 30.99
Granted (in dollars per share) | $ / shares 36.40
Exercised (in dollars per share) | $ / shares 21.21
Expired, cancellations and forfeited (in dollars per share) | $ / shares 35.16
Ending balance, Outstanding at (in dollars per share) | $ / shares 30.90
Weighted Average Exercise Price, Exercisable at period end (in dollars per share) | $ / shares $ 30.05
Average Remaining Contractual Term (in years), Outstanding period end 3 years 1 month 6 days
Average Remaining Contractual Term (in years), Exercisable at period end 2 years 9 months 18 days
Aggregate Intrinsic Value, Outstanding at period end | $ $ 0.0
Aggregate Intrinsic Value, Exercisable at period end | $ $ 0.0