RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the SCAE Plan (Details) - SCAE Plan - USD ($) $ in Millions	12 Months Ended
	May 27, 2018	May 28, 2017	May 29, 2016
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	$ 471.6
Pre-tax expenses recognized	38.0	$ 63.6	$ 281.8
Cumulative pre-tax expenses recognized	460.3
Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	105.7
Pre-tax expenses recognized	7.8
Cumulative pre-tax expenses recognized	100.1
Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	34.9
Pre-tax expenses recognized	0.5
Cumulative pre-tax expenses recognized	34.9
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	56.8
Pre-tax expenses recognized	2.0
Cumulative pre-tax expenses recognized	52.8
Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	14.0
Pre-tax expenses recognized	5.3
Cumulative pre-tax expenses recognized	12.4
Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	365.9
Pre-tax expenses recognized	30.2
Cumulative pre-tax expenses recognized	360.2
Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	152.0
Pre-tax expenses recognized	4.5
Cumulative pre-tax expenses recognized	150.6
Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	24.2
Pre-tax expenses recognized	3.2
Cumulative pre-tax expenses recognized	24.2
Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	4.1
Pre-tax expenses recognized	1.5
Cumulative pre-tax expenses recognized	4.1
Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	86.9
Pre-tax expenses recognized	13.5
Cumulative pre-tax expenses recognized	86.8
Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	55.5
Pre-tax expenses recognized	1.1
Cumulative pre-tax expenses recognized	53.7
Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	43.2
Pre-tax expenses recognized	6.4
Cumulative pre-tax expenses recognized	40.8
Reporting segments | Grocery & Snacks
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	134.3
Pre-tax expenses recognized	14.1
Cumulative pre-tax expenses recognized	127.1
Reporting segments | Grocery & Snacks | Total cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	82.3
Pre-tax expenses recognized	7.8
Cumulative pre-tax expenses recognized	76.7
Reporting segments | Grocery & Snacks | Pension costs
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	33.4
Pre-tax expenses recognized	0.5
Cumulative pre-tax expenses recognized	33.4
Reporting segments | Grocery & Snacks | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	37.0
Pre-tax expenses recognized	2.0
Cumulative pre-tax expenses recognized	33.0
Reporting segments | Grocery & Snacks | Other cost of goods sold
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	11.9
Pre-tax expenses recognized	5.3
Cumulative pre-tax expenses recognized	10.3
Reporting segments | Grocery & Snacks | Total selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	52.0
Pre-tax expenses recognized	6.3
Cumulative pre-tax expenses recognized	50.4
Reporting segments | Grocery & Snacks | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	27.5
Pre-tax expenses recognized	2.6
Cumulative pre-tax expenses recognized	26.5
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	6.1
Pre-tax expenses recognized	(1.2)
Cumulative pre-tax expenses recognized	6.1
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	1.0
Pre-tax expenses recognized	0.2
Cumulative pre-tax expenses recognized	1.0
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	0.1
Cumulative pre-tax expenses recognized	1.0
Reporting segments | Grocery & Snacks | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	16.4
Pre-tax expenses recognized	4.6
Cumulative pre-tax expenses recognized	15.8
Reporting segments | Refrigerated & Frozen
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	43.7
Pre-tax expenses recognized	0.1
Cumulative pre-tax expenses recognized	43.7
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	0.0
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	0.0
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	0.0
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	21.5
Pre-tax expenses recognized	0.1
Cumulative pre-tax expenses recognized	21.5
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	0.0
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	0.0
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	0.0
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	3.3
Pre-tax expenses recognized	0.1
Cumulative pre-tax expenses recognized	3.3
Reporting segments | International
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	4.7
Pre-tax expenses recognized	1.5
Cumulative pre-tax expenses recognized	4.7
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	4.7
Pre-tax expenses recognized	1.5
Cumulative pre-tax expenses recognized	4.7
Reporting segments | International | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	3.7
Pre-tax expenses recognized	1.2
Cumulative pre-tax expenses recognized	3.7
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	0.9
Pre-tax expenses recognized	0.3
Cumulative pre-tax expenses recognized	0.9
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
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
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
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
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
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
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
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
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
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
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
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
Cumulative pre-tax expenses recognized	0.0
Corporate
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	281.0
Pre-tax expenses recognized	22.3
Cumulative pre-tax expenses recognized	276.9
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	279.8
Pre-tax expenses recognized	22.3
Cumulative pre-tax expenses recognized	275.7
Corporate | Severance and related costs, net
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	102.6
Pre-tax expenses recognized	0.7
Cumulative pre-tax expenses recognized	102.2
Corporate | Fixed asset impairment (net of gains on disposal)
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	11.2
Pre-tax expenses recognized	4.4
Cumulative pre-tax expenses recognized	11.2
Corporate | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	4.1
Pre-tax expenses recognized	1.5
Cumulative pre-tax expenses recognized	4.1
Corporate | Contract/lease cancellation expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	84.4
Pre-tax expenses recognized	13.0
Cumulative pre-tax expenses recognized	84.3
Corporate | Consulting/professional fees
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	54.0
Pre-tax expenses recognized	1.0
Cumulative pre-tax expenses recognized	52.2
Corporate | Other selling, general and administrative expenses
Restructuring Cost and Reserve [Line Items]
Pre-tax expenses anticipated to be recognized	23.5
Pre-tax expenses recognized	1.7
Cumulative pre-tax expenses recognized	$ 21.7