Note 8 - Other Intangible Assets, Net (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended		3 Months Ended		12 Months Ended
	Feb. 28, 2015	Feb. 28, 2014	Feb. 28, 2015	Feb. 28, 2014	Aug. 31, 2013	May 31, 2013	May 31, 2014
Note 8 - Other Intangible Assets, Net (Details) [Line Items]
Amortization of Intangible Assets	$ 13.6	$ 13.2	$ 40.9	$ 39.6
Off-Market Favorable Lease [Member]
Note 8 - Other Intangible Assets, Net (Details) [Line Items]
Finite-Lived Intangible Asset, Useful Life					8 years	6 years
In Process Research and Development [Member]
Note 8 - Other Intangible Assets, Net (Details) [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)							$ 0.2