Consolidated Statements Of Equity (Parenthetical) (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Pension liability adjustment, tax	$ (1,415)	$ 4,975	$ (760)
Cash flow hedges, tax	$ (763)	$ 318	$ 563
Cash dividend declared, per share	$ 0.52	$ 0.48	$ 0.40