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Debt (Tables)
 6 Months Ended
Nov. 30, 2015
Debt Disclosure [Abstract]  
Schedule of Debt
The following table summarizes the carrying value of the Company's debt as of the dates indicated:
 
November 30, 2015
 
May 31, 2015
 
November 30, 2014
Loan Agreement:
 
 
 
 
 
   Revolving Loan (interest rates of n/a, n/a
      and 1.4%, respectively)
$
—

 
$
—

 
$
95.0

Unsecured lines of credit (weighted average interest
     rates of 3.3%, 3.8% and 3.9%, respectively)
12.0

 
6.0

 
9.2

Total debt
$
12.0

 
$
6.0

 
$
104.2

Less lines of credit, short-term debt and current
    portion of long-term debt
(12.0
)
 
(6.0
)
 
(9.2
)
Total long-term debt
$
—

 
$
—

 
$
95.0
Schedule of Maturities of Long-term Debt
The following table sets forth the maturities of the Company’s debt obligations as of November 30, 2015, for the twelve-month periods ending November 30,
2016
$
12.0

2017
—

2018
—

2019
—

2020 and thereafter
—

Total debt
$
12.0