Goodwill and Other Intangibles (Details) - Schedule of activity in goodwill (USD $) In Millions, unless otherwise specified	3 Months Ended		12 Months Ended
	Aug. 31, 2014	Aug. 31, 2013	May 31, 2014
Schedule of activity in goodwill [Abstract]
Gross beginning balance	$ 178.7	$ 178.7	$ 178.7
Accumulated impairment	(34.2)	(20.8)	(20.8)
Beginning balance	144.5	157.9	157.9
Impairment charge	0	0	(13.4)
Foreign currency translation	0	0	0
Other	0	0	0
Gross ending balance	178.7	178.7	178.7
Accumulated impairment	(34.2)	(20.8)	(34.2)
Ending balance	$ 144.5	$ 157.9	$ 144.5