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Debt (Tables)
 9 Months Ended
Feb. 28, 2017
Debt Disclosure [Abstract]  
Schedule of Debt
The following table summarizes the carrying value of the Company's debt as of the dates indicated:
 
February 28, 2017
 
May 31, 2016
 
February 29, 2016
Loan Agreement:
 
 
 
 
 
Revolving Loan (interest rates of n/a)
$
—

 
$
—

 
$
—

Unsecured short term lines of credit (weighted average interest rates of 3.9%, 4.4% and 3.7%, respectively)
5.8

 
6.3

 
8.2

Total debt
$
5.8

 
$
6.3

 
$
8.2