RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the SCAE Plan (Details) - SCAE Plan - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Feb. 25, 2018	Feb. 26, 2017	Feb. 25, 2018	Feb. 26, 2017
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	$ 463.1		$ 463.1
Recognized pre-tax expenses	14.7	$ 13.7	33.2	$ 47.6
Cumulative pre-tax expenses	455.5		455.5
Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	125.6		125.6
Recognized pre-tax expenses	0.4		10.6
Cumulative pre-tax expenses	123.6		123.6
Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	43.7		43.7
Recognized pre-tax expenses			0.1
Cumulative pre-tax expenses	43.7		43.7
Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	4.1		4.1
Recognized pre-tax expenses	0.2		1.1
Cumulative pre-tax expenses	4.3		4.3
Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	7.9		7.9
Cumulative pre-tax expenses	7.9		7.9
Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	281.8		281.8
Recognized pre-tax expenses	14.0		21.4
Cumulative pre-tax expenses	276.0		276.0
Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	99.7		99.7
Recognized pre-tax expenses	(0.1)		5.6
Cumulative pre-tax expenses	97.9		97.9
Total cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	76.3		76.3
Recognized pre-tax expenses	(0.1)		5.6
Cumulative pre-tax expenses	74.5		74.5
Total cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	22.2		22.2
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	22.2		22.2
Total cost of goods sold | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Total cost of goods sold | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Total cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	1.2		1.2
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	1.2		1.2
Pension costs
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	34.9		34.9
Recognized pre-tax expenses	(1.6)		0.5
Cumulative pre-tax expenses	34.9		34.9
Pension costs | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	33.4		33.4
Recognized pre-tax expenses	(1.6)		0.5
Cumulative pre-tax expenses	33.4		33.4
Pension costs | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	1.5		1.5
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	1.5		1.5
Pension costs | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Pension costs | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Pension costs | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	52.0		52.0
Recognized pre-tax expenses			1.2
Cumulative pre-tax expenses	52.0		52.0
Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	32.2		32.2
Recognized pre-tax expenses			1.2
Cumulative pre-tax expenses	32.2		32.2
Accelerated depreciation | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	18.6		18.6
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	18.6		18.6
Accelerated depreciation | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	1.2		1.2
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	1.2		1.2
Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	12.8		12.8
Recognized pre-tax expenses	1.5		3.9
Cumulative pre-tax expenses	11.0		11.0
Other cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	10.7		10.7
Recognized pre-tax expenses	1.5		3.9
Cumulative pre-tax expenses	8.9		8.9
Other cost of goods sold | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	2.1		2.1
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	2.1		2.1
Other cost of goods sold | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Other cost of goods sold | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Other cost of goods sold | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	363.4		363.4
Recognized pre-tax expenses	14.8		27.6
Cumulative pre-tax expenses	357.6		357.6
Total selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	49.3		49.3
Recognized pre-tax expenses	0.5		5.0
Cumulative pre-tax expenses	49.1		49.1
Total selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	21.5		21.5
Recognized pre-tax expenses			0.1
Cumulative pre-tax expenses	21.5		21.5
Total selling, general and administrative expenses | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	4.1		4.1
Recognized pre-tax expenses	0.2		1.1
Cumulative pre-tax expenses	4.3		4.3
Total selling, general and administrative expenses | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	7.9		7.9
Cumulative pre-tax expenses	7.9		7.9
Total selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	280.6		280.6
Recognized pre-tax expenses	14.0		21.4
Cumulative pre-tax expenses	274.8		274.8
Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	150.4		150.4
Recognized pre-tax expenses	0.3		3.6
Cumulative pre-tax expenses	149.7		149.7
Severance and related costs, net | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	25.4		25.4
Recognized pre-tax expenses	(0.1)		1.7
Cumulative pre-tax expenses	25.6		25.6
Severance and related costs, net | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	10.3		10.3
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	10.3		10.3
Severance and related costs, net | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	3.4		3.4
Recognized pre-tax expenses	0.2		1.1
Cumulative pre-tax expenses	3.6		3.6
Severance and related costs, net | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	7.9		7.9
Cumulative pre-tax expenses	7.9		7.9
Severance and related costs, net | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	103.4		103.4
Recognized pre-tax expenses	0.2		0.8
Cumulative pre-tax expenses	102.3		102.3
Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	24.0		24.0
Recognized pre-tax expenses			3.0
Cumulative pre-tax expenses	24.0		24.0
Fixed asset impairment (net of gains on disposal) | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	5.9		5.9
Recognized pre-tax expenses			(1.4)
Cumulative pre-tax expenses	5.9		5.9
Fixed asset impairment (net of gains on disposal) | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	6.9		6.9
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	6.9		6.9
Fixed asset impairment (net of gains on disposal) | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.0		0.0
Fixed asset impairment (net of gains on disposal) | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Fixed asset impairment (net of gains on disposal) | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	11.2		11.2
Recognized pre-tax expenses			4.4
Cumulative pre-tax expenses	11.2		11.2
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	4.2		4.2
Recognized pre-tax expenses	0.2		1.5
Cumulative pre-tax expenses	4.1		4.1
Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	4.2		4.2
Recognized pre-tax expenses	0.2		1.5
Cumulative pre-tax expenses	4.1		4.1
Contract/lease termination expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	86.9		86.9
Recognized pre-tax expenses	12.8		12.8
Cumulative pre-tax expenses	86.1		86.1
Contract/lease termination expenses | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.9		0.9
Recognized pre-tax expenses	0.0		0.1
Cumulative pre-tax expenses	0.9		0.9
Contract/lease termination expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.6		0.6
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.6		0.6
Contract/lease termination expenses | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.6		0.6
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.6		0.6
Contract/lease termination expenses | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Contract/lease termination expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	84.8		84.8
Recognized pre-tax expenses	12.8		12.7
Cumulative pre-tax expenses	84.0		84.0
Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	55.7		55.7
Recognized pre-tax expenses	0.2		0.9
Cumulative pre-tax expenses	53.5		53.5
Consulting/professional fees | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	1.1		1.1
Recognized pre-tax expenses	0.0		0.1
Cumulative pre-tax expenses	1.0		1.0
Consulting/professional fees | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.4		0.4
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.4		0.4
Consulting/professional fees | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.1		0.1
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.1		0.1
Consulting/professional fees | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Consulting/professional fees | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	54.1		54.1
Recognized pre-tax expenses	0.2		0.8
Cumulative pre-tax expenses	52.0		52.0
Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	42.2		42.2
Recognized pre-tax expenses	1.3		5.8
Cumulative pre-tax expenses	40.2		40.2
Other selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	16.0		16.0
Recognized pre-tax expenses	0.6		4.5
Cumulative pre-tax expenses	15.7		15.7
Other selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	3.3		3.3
Recognized pre-tax expenses			0.1
Cumulative pre-tax expenses	3.3		3.3
Other selling, general and administrative expenses | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Other selling, general and administrative expenses | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Cumulative pre-tax expenses	0.0		0.0
Other selling, general and administrative expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	22.9		22.9
Recognized pre-tax expenses	0.6		1.2
Cumulative pre-tax expenses	$ 21.2		$ 21.2