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Debt (Tables)
 12 Months Ended
May. 31, 2015
Debt Disclosure [Abstract]  
Schedule of debt
The following table summarizes debt as of May 31: 
 
Carrying
Value
 
Fair
Value
 
Carrying
Value
 
Fair
Value
 
2015
 
2014
Loan Agreement:
 

 
 

 
 

 
 

Revolving Loan (interest rate of n/a and 1.3%, respectively)
$
—

 
$
—

 
$
120.0

 
$
120.0

Unsecured Lines of Credit (weighted average interest
    rates of 3.8% and 2.3%, respectively)
$
6.0

 
$
6.0

 
$
15.8

 
$
15.8

Total debt
$
6.0


$
6.0


$
135.8


$
135.8

Less lines of credit and current portion of long-term
   debt
(6.0
)
 
(6.0
)
 
(15.8
)
 
(15.8
)
Total long-term debt
$
—


$
—


$
120.0


$
120.0
Schedule of maturities of long-term debt
The following table sets forth the maturities of the carrying values of the Company’s debt obligations as of May 31, 2015 for the fiscal years ending May 31: 
2016
$
6.0

2017
—

2018
—

2019
—

2020
—

Thereafter
—

Total debt
$
6.0