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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Feb. 23, 2020 | Aug. 25, 2019 | Nov. 26, 2017 | May 31, 2020 | May 26, 2019 | May 27, 2018 | Dec. 31, 2019 | Nov. 24, 2019 | May 27, 2019 | Sep. 30, 2017
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expense related to expected incurrence of certain multi-employer plan withdrawal costs |  |  |  |  |  | $ 0.3 | $ 0.6 |  |  |  |
Fair value of certain investments |  |  |  |  | $ 52.4 |  |  |  |  |  |
Fair value of funds which have imposed such gates |  |  |  |  | 0.1 |  |  |  |  |  |
Expense related to defined contribution plans |  |  |  |  | $ 49.9 | $ 39.9 | 24.5 |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Maximum allowable funding percentage to be in critical status |  |  |  |  | 65.00% |  |  |  |  |  |
Maximum allowable funding percentage to be in endangered status |  |  |  |  | 80.00% |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [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 Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unfunded commitments for additional investments |  |  |  |  | $ 36.8 |  |  |  |  |  |
Natural resources funds |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Unfunded commitments for additional investments |  |  |  |  | $ 13.5 |  |  |  |  |  |
Fixed income securities |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Target allocation (percent) |  |  |  |  | 90.00% |  |  |  |  |  |
Return seeking securities |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Target allocation (percent) |  |  |  |  | 10.00% |  |  |  |  |  |
Pension Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension curtailment loss within other comprehensive income (loss) | $ 0.2 |  |  |  | $ 0.8 |  | 0.7 |  |  |  |
Effective discount rate assumption | 3.86% | 2.96% |  |  | 2.98% | 3.88% |  | 3.37% | 3.89% |  |
(Increase) decrease to underfunded status of the pension plans | $ (4.3) |  |  |  | $ 0.8 |  |  |  |  |  |
Lump-sum settlement payment |  | $ 154.6 |  |  | 156.3 |  |  |  |  |  |
Settlement gain |  | 2.1 |  |  | 2.1 |  | (1.3) |  |  |  |
Benefit to other comprehensive income (loss) |  | $ 79.8 |  |  |  |  |  |  |  |  |
Charge reflecting year-end write-off of actuarial losses |  |  |  | $ 3.4 | 44.8 | $ 5.1 | $ 3.4 |  |  |  |
Accumulated benefit obligation |  |  |  |  | $ 3,870.0 | $ 3,730.0 |  |  |  |  |
Charge reflecting year-end write-off of actuarial losses percentage |  |  |  |  | 10.00% | 10.00% | 10.00% |  |  |  |
Anticipated contributions to plans in fiscal 2020 |  |  |  |  | $ 32.2 |  |  |  |  |  |
Pension Benefits | Sopinoff |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension curtailment loss within other comprehensive income (loss) |  |  | $ 0.6 |  |  |  |  |  |  |  |
Effective discount rate assumption |  |  | 3.90% |  |  | 3.13% |  |  |  | 3.90% | 3.78%
(Increase) decrease to underfunded status of the pension plans |  |  | $ (12.3) | 43.5 |  |  |  |  |  |  |
Pension curtailment gain (charge) within other comprehensive income (loss) |  |  |  | $ 0.7 |  |  |  |  |  |  |
Other Benefits |  |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |  |
Pension curtailment loss within other comprehensive income (loss) |  |  |  |  |  | $ (0.6) |  |  |  |  |
Effective discount rate assumption |  |  |  |  | 2.39% | 3.48% |  |  |  |  |
(Increase) decrease to underfunded status of the pension plans |  |  |  |  |  | $ 0.6 |  |  |  |  |
Lump-sum settlement payment |  |  |  |  | $ 0.1 | 0.5 |  |  |  |  |
Settlement gain |  |  |  |  | 0.2 | $ 1.0 |  |  |  |  |
Anticipated contributions to plans in fiscal 2020 |  |  |  |  | $ 10.0 |  |  |  |  |  |

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