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Accounts Receivable (Tables)
3 Months Ended
Aug. 31, 2021
Accounts Receivable  
Schedule of accounts receivable

August 31, 

May 31, 

    

2021

    

2021

U.S. Government contracts:

 

  

 

  

Trade receivables

$

23.0

$

24.1

Unbilled receivables

 

21.2

 

25.2

 

44.2

 

49.3

All other customers:

 

 

  

Trade receivables

 

120.5

 

104.9

Unbilled receivables

 

16.1

 

12.5

 

136.6

 

117.4

$

180.8

$

166.7