Discontinued Operations (Details) - Schedule of operating results of the discontinued operations (USD $) In Millions, unless otherwise specified	12 Months Ended
	May 31, 2013	May 31, 2012	May 31, 2011
Schedule of operating results of the discontinued operations [Abstract]
Revenues	$ 6.2	$ 9.8	$ 28.5
Gain (loss) on sale	(1.1)		0.3
Earnings (loss) before income taxes	(7.2)	(7.2)	(7.6)
Income tax benefit (provision)	2.5	1.5	1.7
Earnings (loss) from discontinued operations, net of tax	$ (4.7)	$ (5.7)	$ (5.9)