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Accounts Receivable (Details) - USD ($)
$ in Millions
Feb. 28, 2026
May 31, 2025
Accounts Receivable    
Total accounts receivable $ 426.2 $ 354.8
U.S. Government contracts    
Accounts Receivable    
Trade receivables 42.7 26.6
Unbilled receivables 6.0 13.4
Total accounts receivable 48.7 40.0
All other customers    
Accounts Receivable    
Trade receivables 346.5 283.4
Unbilled receivables 31.0 31.4
Total accounts receivable $ 377.5 $ 314.8