GOODWILL AND OTHER IDENTIFIABLE INTANGIBLE ASSETS (Narrative) (Details) $ in Millions	3 Months Ended	12 Months Ended
	May. 31, 2015 USD ($)	May. 31, 2015 USD ($) reporting_unit	May. 25, 2014 USD ($) brand	May. 26, 2013 USD ($)
Indefinite-lived Intangible Assets [Line Items]
Fair Value Inputs, Discount Rate		8.00%
Fair Value Inputs, Long-term Revenue Growth Rate		3.00%
Impairment		$ 1,527.9	$ 602.2
Goodwill	$ 6,300.3	6,300.3	7,828.5	$ 8,418.7
Noncurrent assets held for sale	0.0	0.0	198.9
Long-lived asset impairment charge		$ (627.3)	(116.6)	0.0
Weighted average life in years of amortizing intangible assets		21 years
Recognized amortization expense		$ 108.5	111.4	55.7
Average amortization expense	107.9	107.9
Amortization expense year one	109.0	109.0
Amortization expense year five	106.1	106.1
Retail Bakery
Indefinite-lived Intangible Assets [Line Items]
Impairment	174.4		55.4
Goodwill	535.5	535.5
Condiments
Indefinite-lived Intangible Assets [Line Items]
Impairment		136.1
Pasta
Indefinite-lived Intangible Assets [Line Items]
Impairment	157.1		94.2
Goodwill	588.2	588.2
Snacks
Indefinite-lived Intangible Assets [Line Items]
Impairment	536.5		231.6
Goodwill	276.5	$ 276.5
Private Brands
Indefinite-lived Intangible Assets [Line Items]
Number of reporting units | reporting_unit		6
Impairment	1,530.0	$ 1,527.9	602.2
Number of reporting units with fair value substantially less than carrying value | reporting_unit		4
Goodwill	1,669.5	$ 1,669.5	3,214.6	3,793.2
Impairment of Intangible Assets (Excluding Goodwill)		43.7	$ 3.2
Number of brands impaired | brand			2
Private Brands | Goodwill
Indefinite-lived Intangible Assets [Line Items]
Noncurrent assets held for sale	17.5	17.5
Long-lived asset impairment charge		17.5
Private Brands | Amortizing Intangible Assets
Indefinite-lived Intangible Assets [Line Items]
Noncurrent assets held for sale	14.4	14.4
Long-lived asset impairment charge		7.9
Consumer Foods
Indefinite-lived Intangible Assets [Line Items]
Impairment		0.0	$ 0.0
Goodwill	3,743.1	3,743.1	3,748.5	3,760.5
Impairment of Intangible Assets (Excluding Goodwill)		4.8	72.5
Commercial Foods
Indefinite-lived Intangible Assets [Line Items]
Impairment		0.0	0.0
Goodwill	887.7	887.7	865.4	$ 865.0
Impairment of Intangible Assets (Excluding Goodwill)		0.3
Cereal
Indefinite-lived Intangible Assets [Line Items]
Impairment	195.1		154.6
Goodwill	269.3	$ 269.3
Corporate
Indefinite-lived Intangible Assets [Line Items]
Impairment of Intangible Assets (Excluding Goodwill)			3.2
Bars and Coordinated
Indefinite-lived Intangible Assets [Line Items]
Impairment	$ 328.7		$ 66.4