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

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August 31, 

    

May 31, 

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2020

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2020

Aircraft and engine parts, components and finished goods

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$

536.8

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$

556.6

Raw materials and parts

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40.1

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45.9

Work-in-process

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20.8

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20.6

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$

597.7

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$

623.1