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Inventories (Details) - USD ($)
$ in Millions
Aug. 31, 2023
May 31, 2023
Inventories    
Aircraft and engine parts, components and finished goods $ 534.1 $ 488.9
Raw materials and parts 52.4 59.6
Work-in-process 27.7 25.6
Total inventories $ 614.2 $ 574.1