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Debt (Tables)
 9 Months Ended
Feb. 29, 2016
Debt Disclosure [Abstract]  
Schedule of Debt
The following table summarizes the carrying value of the Company's debt as of the dates indicated:
 
February 29, 2016
 
May 31, 2015
 
February 28, 2015
Loan Agreement:
 
 
 
 
 
   Revolving Loan (interest rates of n/a, n/a
    and 1.4%, respectively)
$
—

 
$
—

 
$
65.0

Unsecured lines of credit (weighted average interest
    rates of 3.7%, 3.8% and 2.7%, respectively)
8.2

 
6.0

 
19.1

Total debt
$
8.2

 
$
6.0

 
$
84.1

Less lines of credit, short-term debt and current
    portion of long-term debt
(8.2
)
 
(6.0
)
 
(19.1
)
Total long-term debt
$
—

 
$
—

 
$
65.0
Schedule of Maturities of Long-term Debt
The following table sets forth the maturities of the Company’s debt obligations as of February 29, 2016, for the twelve-month periods ending February 28,
2017
$
8.2

2018
—

2019
—

2020
—

2021 and thereafter
—

Total debt
$
8.2