Accumulated Other Comprehensive Income (Loss) (Reclassifications Out of Accumulated Other Comprehensive Income (Loss)) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	May 31, 2014
Equity [Abstract]
Amortization of interest rate locks	$ (3,130)
Tax benefit	1,178
Amortization of interest rate locks, net of tax	$ (1,952)