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Debt (Tables)
 12 Months Ended
May 31, 2018
Debt Disclosure [Abstract]  
Schedule of debt
The following table summarizes the Company's debt as of May 31: 
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
2018
 
2017
 
 
 
 
 
 
 
 
Loan Agreement:
 

 
 

 
 

 
 

Revolving Loan
$
—

 
$
—

 
$
—

 
$
—

Unsecured Lines of Credit (weighted average interest rates of 2.9% and 4.1%, respectively)
7.9

 
7.9

 
6.2

 
6.2

Total debt
$
7.9


$
7.9


$
6.2


$
6.2

Less lines of credit and current portion of long-term debt
(7.9
)
 
(7.9
)
 
(6.2
)
 
(6.2
)
Total long-term debt
$
—


$
—


$
—


$
—