Debt (Tables)

3 Months Ended

Aug. 31, 2014

Debt Disclosure [Abstract]

Schedule of Debt [Table Text Block]

The following table summarizes the carrying value of the Company's debt as of the dates indicated:

	August 31, 2014			May 31, 2014			August 31, 2013
Loan Agreement:
Revolving Loan (interest rates of 1.4%, 1.3%       and 1.4%, respectively)	$	185.0		$	120.0		$	15.0
Unsecured lines of credit (weighted average interest      rates of 2.3%, 2.3% and 3.6%, respectively)	$	13.9		$	15.8		$	14.2
Total debt	$	198.9		$	135.8		$	29.2
Less lines of credit, short-term debt and current     portion of long-term debt	(13.9		)	(15.8		)	(29.2		)
Total long-term debt	$	185.0		$	120.0		$	—

Schedule of Maturities of Long-term Debt [Table Text Block]

The following table sets forth the maturities of the Company’s debt obligations as of August 31, 2014, for the twelve-month periods ending August 31,

2015	$	13.9
2016	$	—
2017	$	—
2018	$	185.0
Total debt	$	198.9