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. 26, 2017	Feb. 28, 2016	Feb. 26, 2017	Feb. 28, 2016
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	$ 442.6		$ 442.6
Recognized pre-tax expenses	13.7	$ 109.1	47.6	$ 259.5
Cumulative pre-tax expenses	406.3		406.3
Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	119.9		119.9
Recognized pre-tax expenses	9.1		15.4
Cumulative pre-tax expenses	103.1		103.1
Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	43.8		43.8
Recognized pre-tax expenses	(1.1)		6.1
Cumulative pre-tax expenses	43.5		43.5
Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	2.5		2.5
Recognized pre-tax expenses	(0.3)		0.3
Cumulative pre-tax expenses	2.6		2.6
Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	7.9		7.9
Recognized pre-tax expenses			1.8
Cumulative pre-tax expenses	7.9		7.9
Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	268.5		268.5
Recognized pre-tax expenses	6.0		24.0
Cumulative pre-tax expenses	249.2		249.2
Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	97.2		97.2
Recognized pre-tax expenses	4.7		11.7
Cumulative pre-tax expenses	86.8		86.8
Total cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	73.8		73.8
Recognized pre-tax expenses	4.7		10.3
Cumulative pre-tax expenses	63.4		63.4
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		1.4
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
Recognized pre-tax expenses			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
Multi-employer pension costs
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	33.2		33.2
Recognized pre-tax expenses	2.0		2.0
Cumulative pre-tax expenses	33.3		33.3
Multi-employer pension costs | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	31.7		31.7
Recognized pre-tax expenses	2.0		2.0
Cumulative pre-tax expenses	31.8		31.8
Multi-employer 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		0.0
Cumulative pre-tax expenses	1.5		1.5
Multi-employer 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
Multi-employer pension costs | Reporting segments | Foodservice
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
Multi-employer 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	56.4		56.4
Recognized pre-tax expenses	2.3		7.2
Cumulative pre-tax expenses	47.2		47.2
Accelerated depreciation | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	36.6		36.6
Recognized pre-tax expenses	2.3		6.0
Cumulative pre-tax expenses	27.4		27.4
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		1.2
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		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
Recognized pre-tax expenses			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		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	7.6		7.6
Recognized pre-tax expenses	0.4		2.5
Cumulative pre-tax expenses	6.3		6.3
Other cost of goods sold | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	5.5		5.5
Recognized pre-tax expenses	0.4		2.3
Cumulative pre-tax expenses	4.2		4.2
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		0.2
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
Recognized pre-tax expenses			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	345.4		345.4
Recognized pre-tax expenses	9.0		35.9
Cumulative pre-tax expenses	319.5		319.5
Total selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	46.1		46.1
Recognized pre-tax expenses	4.4		5.1
Cumulative pre-tax expenses	39.7		39.7
Total selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	21.6		21.6
Recognized pre-tax expenses	(1.1)		4.7
Cumulative pre-tax expenses	21.3		21.3
Total selling, general and administrative expenses | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	2.5		2.5
Recognized pre-tax expenses	(0.3)		0.3
Cumulative pre-tax expenses	2.6		2.6
Total selling, general and administrative expenses | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	7.9		7.9
Recognized pre-tax expenses			1.8
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	267.3		267.3
Recognized pre-tax expenses	6.0		24.0
Cumulative pre-tax expenses	248.0		248.0
Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	146.7		146.7
Recognized pre-tax expenses	4.0		8.8
Cumulative pre-tax expenses	144.6		144.6
Severance and related costs, net | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	22.3		22.3
Recognized pre-tax expenses	0.6		1.2
Cumulative pre-tax expenses	21.8		21.8
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		(0.2)
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	2.4		2.4
Recognized pre-tax expenses	(0.3)		0.2
Cumulative pre-tax expenses	2.4		2.4
Severance and related costs, net | Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	7.9		7.9
Recognized pre-tax expenses			1.8
Cumulative pre-tax expenses	7.9		7.9
Severance and related costs, net | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	103.8		103.8
Recognized pre-tax expenses	3.7		5.8
Cumulative pre-tax expenses	102.2		102.2
Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	19.6		19.6
Recognized pre-tax expenses	0.6		6.0
Cumulative pre-tax expenses	17.6		17.6
Fixed asset impairment (net of gains on disposal) | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	8.7		8.7
Recognized pre-tax expenses	1.8		(0.3)
Cumulative pre-tax expenses	6.9		6.9
Fixed asset impairment (net of gains on disposal) | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	6.8		6.8
Recognized pre-tax expenses	(1.4)		3.2
Cumulative pre-tax expenses	6.8		6.8
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		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
Recognized pre-tax expenses			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	4.1		4.1
Recognized pre-tax expenses	0.2		3.1
Cumulative pre-tax expenses	3.9		3.9
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	4.1		4.1
Recognized pre-tax expenses	0.3		0.8
Cumulative pre-tax expenses	2.1		2.1
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		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
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.0		0.0
Accelerated depreciation | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	4.1		4.1
Recognized pre-tax expenses	0.3		0.8
Cumulative pre-tax expenses	2.1		2.1
Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	73.8		73.8
Recognized pre-tax expenses	1.2		8.7
Cumulative pre-tax expenses	71.7		71.7
Contract/lease cancellation 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		0.0
Cumulative pre-tax expenses	0.8		0.8
Contract/lease cancellation expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.6		0.6
Recognized pre-tax expenses	0.1		0.1
Cumulative pre-tax expenses	0.6		0.6
Contract/lease cancellation expenses | Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	0.0		0.0
Recognized pre-tax expenses	0.0		0.1
Cumulative pre-tax expenses	0.1		0.1
Contract/lease cancellation expenses | Reporting segments | Foodservice
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
Contract/lease cancellation expenses | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	72.3		72.3
Recognized pre-tax expenses	1.1		8.5
Cumulative pre-tax expenses	70.2		70.2
Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	54.1		54.1
Recognized pre-tax expenses			0.3
Cumulative pre-tax expenses	52.2		52.2
Consulting/professional fees | Reporting segments | Grocery & Snacks
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
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
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
Recognized pre-tax expenses			0.0
Cumulative pre-tax expenses	0.0		0.0
Consulting/professional fees | Corporate
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	53.0		53.0
Recognized pre-tax expenses			0.3
Cumulative pre-tax expenses	51.1		51.1
Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	47.1		47.1
Recognized pre-tax expenses	2.9		11.3
Cumulative pre-tax expenses	31.3		31.3
Other selling, general and administrative expenses | Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	13.6		13.6
Recognized pre-tax expenses	2.0		4.2
Cumulative pre-tax expenses	9.6		9.6
Other selling, general and administrative expenses | Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Anticipated pre-tax expenses	3.5		3.5
Recognized pre-tax expenses	0.2		1.6
Cumulative pre-tax expenses	3.2		3.2
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
Recognized pre-tax expenses			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	30.0		30.0
Recognized pre-tax expenses	0.7		5.5
Cumulative pre-tax expenses	$ 18.5		$ 18.5