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Service Revenue (Summary of Changes in Deferred Revenue Related to Material Rights Performance Obligations) (Details) - USD ($)
$ in Millions
12 Months Ended
May 31, 2024
May 31, 2023
Revenue from Contract with Customer [Abstract]    
Balance, beginning of period $ 62.0 $ 48.9
Deferral of revenue 46.7 42.1
Recognition of unearned revenue (33.8) (29.0)
Balance, end of period $ 74.9 $ 62.0