RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the SCAE Plan (Details) - SCAE Plan - USD ($) $ in Millions	12 Months Ended
	May 28, 2017	May 29, 2016	May 31, 2015
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	$ 446.2
Pre-tax expenses recognized	63.6	$ 281.8	$ 47.7
Cumulative pre-tax expenses recognized	422.3
Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	101.2
Pre-tax expenses recognized	17.2
Cumulative pre-tax expenses recognized	92.3
Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	34.4
Pre-tax expenses recognized	3.1
Cumulative pre-tax expenses recognized	34.4
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	58.7
Pre-tax expenses recognized	10.8
Cumulative pre-tax expenses recognized	50.8
Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	8.1
Pre-tax expenses recognized	3.3
Cumulative pre-tax expenses recognized	7.1
Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	345.0
Pre-tax expenses recognized	46.4
Cumulative pre-tax expenses recognized	330.0
Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	147.7
Pre-tax expenses recognized	10.3
Cumulative pre-tax expenses recognized	146.1
Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	21.0
Pre-tax expenses recognized	9.4
Cumulative pre-tax expenses recognized	21.0
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	4.1
Pre-tax expenses recognized	1.3
Cumulative pre-tax expenses recognized	2.6
Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	74.6
Pre-tax expenses recognized	10.3
Cumulative pre-tax expenses recognized	73.3
Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	54.2
Pre-tax expenses recognized	0.7
Cumulative pre-tax expenses recognized	52.6
Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	43.4
Pre-tax expenses recognized	14.4
Cumulative pre-tax expenses recognized	34.4
Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	125.3
Pre-tax expenses recognized	25.3
Cumulative pre-tax expenses recognized	113.0
Reporting segments | Grocery & Snacks | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	77.8
Pre-tax expenses recognized	15.8
Cumulative pre-tax expenses recognized	68.9
Reporting segments | Grocery & Snacks | Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	32.9
Pre-tax expenses recognized	3.1
Cumulative pre-tax expenses recognized	32.9
Reporting segments | Grocery & Snacks | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	38.9
Pre-tax expenses recognized	9.6
Cumulative pre-tax expenses recognized	31.0
Reporting segments | Grocery & Snacks | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	6.0
Pre-tax expenses recognized	3.1
Cumulative pre-tax expenses recognized	5.0
Reporting segments | Grocery & Snacks | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	47.5
Pre-tax expenses recognized	9.5
Cumulative pre-tax expenses recognized	44.1
Reporting segments | Grocery & Snacks | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	24.9
Pre-tax expenses recognized	3.3
Cumulative pre-tax expenses recognized	23.9
Reporting segments | Grocery & Snacks | Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	7.3
Pre-tax expenses recognized	0.1
Cumulative pre-tax expenses recognized	7.3
Reporting segments | Grocery & Snacks | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Grocery & Snacks | Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.8
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.8
Reporting segments | Grocery & Snacks | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	1.0
Pre-tax expenses recognized	0.3
Cumulative pre-tax expenses recognized	0.9
Reporting segments | Grocery & Snacks | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	13.5
Pre-tax expenses recognized	5.8
Cumulative pre-tax expenses recognized	11.2
Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	43.6
Pre-tax expenses recognized	6.2
Cumulative pre-tax expenses recognized	43.6
Reporting segments | Refrigerated & Frozen | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	22.2
Pre-tax expenses recognized	1.4
Cumulative pre-tax expenses recognized	22.2
Reporting segments | Refrigerated & Frozen | Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	1.5
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	1.5
Reporting segments | Refrigerated & Frozen | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	18.6
Pre-tax expenses recognized	1.2
Cumulative pre-tax expenses recognized	18.6
Reporting segments | Refrigerated & Frozen | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	2.1
Pre-tax expenses recognized	0.2
Cumulative pre-tax expenses recognized	2.1
Reporting segments | Refrigerated & Frozen | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	21.4
Pre-tax expenses recognized	4.8
Cumulative pre-tax expenses recognized	21.4
Reporting segments | Refrigerated & Frozen | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	10.3
Pre-tax expenses recognized	(0.2)
Cumulative pre-tax expenses recognized	10.3
Reporting segments | Refrigerated & Frozen | Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	6.9
Pre-tax expenses recognized	3.3
Cumulative pre-tax expenses recognized	6.9
Reporting segments | Refrigerated & Frozen | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Refrigerated & Frozen | Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.6
Pre-tax expenses recognized	0.1
Cumulative pre-tax expenses recognized	0.6
Reporting segments | Refrigerated & Frozen | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.4
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.4
Reporting segments | Refrigerated & Frozen | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	3.2
Pre-tax expenses recognized	1.6
Cumulative pre-tax expenses recognized	3.2
Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	3.2
Pre-tax expenses recognized	0.9
Cumulative pre-tax expenses recognized	3.2
Reporting segments | International | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | International | Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | International | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | International | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | International | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	3.2
Pre-tax expenses recognized	0.9
Cumulative pre-tax expenses recognized	3.2
Reporting segments | International | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	2.5
Pre-tax expenses recognized	0.3
Cumulative pre-tax expenses recognized	2.5
Reporting segments | International | Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | International | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | International | Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.6
Pre-tax expenses recognized	0.6
Cumulative pre-tax expenses recognized	0.6
Reporting segments | International | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.1
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.1
Reporting segments | International | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	7.9
Pre-tax expenses recognized	1.8
Cumulative pre-tax expenses recognized	7.9
Reporting segments | Foodservice | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	7.9
Pre-tax expenses recognized	1.8
Cumulative pre-tax expenses recognized	7.9
Reporting segments | Foodservice | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	7.9
Pre-tax expenses recognized	1.8
Cumulative pre-tax expenses recognized	7.9
Reporting segments | Foodservice | Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Reporting segments | Foodservice | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Corporate
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	266.2
Pre-tax expenses recognized	29.4
Cumulative pre-tax expenses recognized	254.6
Corporate | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	1.2
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	1.2
Corporate | Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Corporate | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	1.2
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	1.2
Corporate | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	0.0
Pre-tax expenses recognized	0.0
Cumulative pre-tax expenses recognized	0.0
Corporate | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	265.0
Pre-tax expenses recognized	29.4
Cumulative pre-tax expenses recognized	253.4
Corporate | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	102.1
Pre-tax expenses recognized	5.1
Cumulative pre-tax expenses recognized	101.5
Corporate | Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	6.8
Pre-tax expenses recognized	6.0
Cumulative pre-tax expenses recognized	6.8
Corporate | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	4.1
Pre-tax expenses recognized	1.3
Cumulative pre-tax expenses recognized	2.6
Corporate | Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	72.6
Pre-tax expenses recognized	9.6
Cumulative pre-tax expenses recognized	71.3
Corporate | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	52.7
Pre-tax expenses recognized	0.4
Cumulative pre-tax expenses recognized	51.2
Corporate | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	26.7
Pre-tax expenses recognized	7.0
Cumulative pre-tax expenses recognized	$ 20.0