Goodwill and Other Intangible Assets (Schedule of at-risk brand intangible assets) (Details) - USD ($) $ in Millions	9 Months Ended
	Feb. 28, 2016	May. 31, 2015
Indefinite-lived Intangible Assets [Line Items]
Carrying Value	$ 4,509.8	$ 4,677.0
Mountain High Brand [Member]
Indefinite-lived Intangible Assets [Line Items]
Carrying Value	$ 35.4
Excess Fair Value Above Carrying Value, Percentage	20.00%
Uncle Toby's Brand [Member]
Indefinite-lived Intangible Assets [Line Items]
Carrying Value	$ 52.2
Excess Fair Value Above Carrying Value, Percentage	11.00%