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RESTRUCTURING ACTIVITIES - Schedule of Pre-Tax Expenses in Association with the SCAE Plan (Details) - SCAE Plan - USD ($) $ in Millions | 12 Months Ended
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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 |  |

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