RESTRUCTURING ACTIVITIES (Consolidated Amounts) (Details) - SCAE Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 28, 2016	Feb. 22, 2015	Feb. 28, 2016	Feb. 22, 2015
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	$ 525.3		$ 525.3
Recognized pre-tax expense	109.1	$ 9.9	259.5	$ 35.9
Cumulative pre-tax expense	338.5		338.5
Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	362.8		362.8
Recognized pre-tax expense	60.9		195.1
Cumulative pre-tax expense	212.7		212.7
Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	154.4		154.4
Recognized pre-tax expense	48.2		64.3
Cumulative pre-tax expense	117.7		117.7
Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	8.1		8.1
Recognized pre-tax expense	0.0		0.1
Cumulative pre-tax expense	8.1		8.1
Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	97.1		97.1
Recognized pre-tax expense	35.9		45.4
Cumulative pre-tax expense	71.5		71.5
Total cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	1.2		1.2
Recognized pre-tax expense	0.0		0.2
Cumulative pre-tax expense	1.2		1.2
Total cost of goods sold | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	95.9		95.9
Recognized pre-tax expense	35.9		45.2
Cumulative pre-tax expense	70.3		70.3
Total cost of goods sold | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Multi-employer pension costs
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	31.3		31.3
Recognized pre-tax expense	29.8
Cumulative pre-tax expense	31.3		31.3
Multi-employer pension costs | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Multi-employer pension costs | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	31.3		31.3
Recognized pre-tax expense	29.8		29.8
Cumulative pre-tax expense	31.3		31.3
Multi-employer pension costs | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	56.9		56.9
Recognized pre-tax expense	4.9		14.0
Cumulative pre-tax expense	36.5		36.5
Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	1.2		1.2
Recognized pre-tax expense	0.0		0.2
Cumulative pre-tax expense	1.2		1.2
Accelerated depreciation | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	55.7		55.7
Recognized pre-tax expense	4.9		13.8
Cumulative pre-tax expense	35.3		35.3
Accelerated depreciation | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	8.9		8.9
Recognized pre-tax expense	1.2		1.6
Cumulative pre-tax expense	3.7		3.7
Other cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Other cost of goods sold | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	8.9		8.9
Recognized pre-tax expense	1.2		1.6
Cumulative pre-tax expense	3.7		3.7
Other cost of goods sold | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0
Cumulative pre-tax expense	0.0		0.0
Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	428.2		428.2
Recognized pre-tax expense	73.2		214.1
Cumulative pre-tax expense	267.0		267.0
Total selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	361.6		361.6
Recognized pre-tax expense	60.9		194.9
Cumulative pre-tax expense	211.5		211.5
Total selling, general and administrative expenses | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	58.5		58.5
Recognized pre-tax expense	12.3		19.1
Cumulative pre-tax expense	47.4		47.4
Total selling, general and administrative expenses | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	8.1		8.1
Recognized pre-tax expense	0.0		0.1
Cumulative pre-tax expense	8.1		8.1
Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	219.8		219.8
Recognized pre-tax expense	39.2		99.8
Cumulative pre-tax expense	137.2		137.2
Severance and related costs, net | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	177.2		177.2
Recognized pre-tax expense	33.6		89.0
Cumulative pre-tax expense	96.8		96.8
Severance and related costs, net | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	34.5		34.5
Recognized pre-tax expense	5.6		10.7
Cumulative pre-tax expense	32.3		32.3
Severance and related costs, net | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	8.1		8.1
Recognized pre-tax expense	0.0		0.1
Cumulative pre-tax expense	8.1		8.1
Fixed asset impairment/Net gain on disposal
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	7.1		7.1
Recognized pre-tax expense	6.1		6.0
Cumulative pre-tax expense	7.1		7.1
Fixed asset impairment/Net gain on disposal | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Fixed asset impairment/Net gain on disposal | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	7.1		7.1
Recognized pre-tax expense	6.1		6.0
Cumulative pre-tax expense	7.1		7.1
Fixed asset impairment/Net gain on disposal | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	1.5		1.5
Recognized pre-tax expense	0.2		0.3
Cumulative pre-tax expense	1.1		1.1
Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	1.5		1.5
Recognized pre-tax expense	0.2		0.3
Cumulative pre-tax expense	1.1		1.1
Accelerated depreciation | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Accelerated depreciation | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Contract/Lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	61.4		61.4
Recognized pre-tax expense	7.2		58.3
Cumulative pre-tax expense	60.0		60.0
Contract/Lease cancellation expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	60.2		60.2
Recognized pre-tax expense	7.2		59.0
Cumulative pre-tax expense	59.3		59.3
Contract/Lease cancellation expenses | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	1.2		1.2
Recognized pre-tax expense	0.0		(0.7)
Cumulative pre-tax expense	0.7		0.7
Contract/Lease cancellation expenses | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Consulting/Professional fees
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	65.3		65.3
Recognized pre-tax expense	17.8		43.0
Cumulative pre-tax expense	46.8		46.8
Consulting/Professional fees | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	64.2		64.2
Recognized pre-tax expense	17.7		42.9
Cumulative pre-tax expense	45.7		45.7
Consulting/Professional fees | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	1.1		1.1
Recognized pre-tax expense	0.1		0.1
Cumulative pre-tax expense	1.1		1.1
Consulting/Professional fees | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	0.0		0.0
Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	73.1		73.1
Recognized pre-tax expense	2.7		6.7
Cumulative pre-tax expense	14.8		14.8
Other selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	58.5		58.5
Recognized pre-tax expense	2.2		3.7
Cumulative pre-tax expense	8.6		8.6
Other selling, general and administrative expenses | Consumer Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	14.6		14.6
Recognized pre-tax expense	0.5		3.0
Cumulative pre-tax expense	6.2		6.2
Other selling, general and administrative expenses | Commercial Foods | Reporting segments
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expense	0.0		0.0
Recognized pre-tax expense	0.0		0.0
Cumulative pre-tax expense	$ 0.0		$ 0.0