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Accounts Receivable (Tables)
3 Months Ended
Aug. 31, 2020
Accounts Receivable  
Schedule of accounts receivable

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August 31,

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May 31,

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2020

    

2020

U.S. Government contracts:

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Trade receivables

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$

36.1

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$

33.9

Unbilled receivables

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33.4

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27.4

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69.5

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61.3

All other customers:

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Trade receivables

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77.7

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81.7

Unbilled receivables

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19.5

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28.9

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97.2

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110.6

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$

166.7

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$

171.9

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