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Inventories (Tables)
3 Months Ended
Aug. 31, 2020
Inventories  
Summary of inventories

    

August 31, 

    

May 31, 

2020

2020

Aircraft and engine parts, components and finished goods

$

536.8

$

556.6

Raw materials and parts

 

40.1

 

45.9

Work-in-process

20.8

20.6

$

597.7

$

623.1