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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Nov. 26, 2017 | May 26, 2019 | May 27, 2018 | May 28, 2017 | May 29, 2016 | Sep. 30, 2017 | Aug. 27, 2017 | Dec. 31, 2016 | Nov. 09, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Expense related to expected incurrence of certain multi-employer plan withdrawal costs |  | $ 0.3 | $ 0.6 | $ 4.0 |  |  |  |  |
Fair value of certain investments |  | 51.0 |  |  |  |  |  |  |
Fair value of funds which have imposed such gates |  | 4.2 |  |  |  |  |  |  |
Additional expense related to expected incurrence of certain withdrawal costs |  | 0.3 | 0.6 | 4.0 |  |  |  |  |
Expense related to defined contribution plans |  | $ 39.9 | $ 24.5 | 18.0 |  |  |  |  |
Generally less than |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Maximum allowable funding percentage to be in critical status |  | 65.00% |  |  |  |  |  |  |
Maximum allowable funding percentage to be in endangered status |  | 80.00% |  |  |  |  |  |  |
Generally at least |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Minimum required funding percentage to be in the green zone |  | 80.00% |  |  |  |  |  |  |
Percentage of plan's total contribution under Forms 5500 (more than) |  | 5.00% |  |  |  |  |  |  |
Private equity funds |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Unfunded commitments for additional investments |  | $ 48.3 |  |  |  |  |  |  |
Natural resources funds |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Unfunded commitments for additional investments |  | $ 17.0 |  |  |  |  |  |  |
Fixed income securities |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Target allocation (percent) |  | 90.00% |  |  |  |  |  |  |
Return seeking securities |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Target allocation (percent) |  | 10.00% |  |  |  |  |  |  |
Pension Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Effective discount rate assumption |  | 3.88% | 4.14% |  |  |  |  | 4.11% |
Decrease to underfunded status of the pension plans |  | $ 0.0 | $ 79.5 |  |  |  |  |  |
Charge reflecting year-end write-off of actuarial losses | $ 3.4 |  | 5.1 | 3.4 | $ 1.2 |  |  |  |
Accumulated benefit obligation |  | 3,700.0 | 3,400.0 |  |  |  |  |  |
Lump-sum settlement payments |  | 0.0 | 10.2 | 287.5 |  |  |  |  |
Settlement charge |  | 0.0 | 1.3 | 13.8 |  |  |  |  |
Benefit to accumulated other comprehensive income (loss) |  |  |  | 62.2 |  |  |  |  |
Pre-tax reduction in total pension benefit cost associated with change in accounting estimate |  | (16.4) | $ (49.0) | (0.9) |  |  |  |  |
Anticipated contributions to plans in fiscal 2020 |  | $ 14.2 |  |  |  |  |  |  |
Other Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Effective discount rate assumption |  | 3.48% | 3.81% |  |  |  |  |  |
Decrease to underfunded status of the pension plans |  | $ 0.6 | $ 0.0 |  |  |  |  |  |
Lump-sum settlement payments |  | 0.5 | 0.0 |  |  |  |  |  |
Settlement charge |  | (1.0) | 0.0 | 0.0 |  |  |  |  |
Pre-tax reduction in total pension benefit cost associated with change in accounting estimate |  | (1.3) | $ 0.7 | (1.2) |  |  |  |  |
Anticipated contributions to plans in fiscal 2020 |  | $ 10.8 |  |  |  |  |  |  |
Spinoff | Pension Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Effective discount rate assumption |  |  |  |  | 3.86% | 3.78% | 3.90% |  | 4.04%
Decrease to underfunded status of the pension plans | 43.5 |  |  | 66.0 |  |  |  |  |
Pension curtailment gain (charge) within other comprehensive income (loss) | $ (0.7) |  |  | 19.5 |  |  |  |  |
Discontinued operations |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Expense related to expected incurrence of certain multi-employer plan withdrawal costs |  |  |  | 2.1 |  |  |  |  |
Restructuring activities |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Expense related to expected incurrence of certain multi-employer plan withdrawal costs |  |  |  | 1.9 |  |  |  |  |
Change in Assumptions for Defined Benefit Plans | Pension Benefits |  |  |  |  |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |  |  |
Pre-tax reduction in total pension benefit cost associated with change in accounting estimate |  |  |  | $ 27.0 |  |  |  |  |

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