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Debt (Tables)
 3 Months Ended
Aug. 31, 2015
Debt Disclosure [Abstract]  
Schedule of Debt
The following table summarizes the carrying value of the Company's debt as of the dates indicated:
 
August 31, 2015
 
May 31, 2015
 
August 31, 2014
Loan Agreement:
 
 
 
 
 
   Revolving Loan (interest rates of n/a, n/a
      and 1.4%, respectively)
$
—

 
$
—

 
$
185.0

Unsecured lines of credit (weighted average interest
     rates of 3.5%, 3.8% and 2.3%, respectively)
$
5.7

 
$
6.0

 
$
13.9

Total debt
$
5.7

 
$
6.0

 
$
198.9

Less lines of credit, short-term debt and current
    portion of long-term debt
(5.7
)
 
(6.0
)
 
(13.9
)
Total long-term debt
$
—

 
$
—

 
$
185.0
Schedule of Maturities of Long-term Debt
The following table sets forth the maturities of the Company’s debt obligations as of August 31, 2015, for the twelve-month periods ending August 31,
2016
$
5.7

2017
—

2018
—

2019
—

Total debt
$
5.7