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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) |  | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Feb. 23, 2020 | Aug. 25, 2019 | May 30, 2021 | May 31, 2020 | May 26, 2019 | Dec. 31, 2019 | Nov. 24, 2019 | May 27, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |
Fair value of certain investments |  |  |  | $ 52,200,000 |  |  |  |  |
Fair value of funds which have imposed such gates |  |  |  | 0 |  |  |  |  |
Expense related to expected incurrence of certain multi-employer plan withdrawal costs |  |  |  |  |  | $ 300,000 |  |  |
Expense related to defined contribution plans |  |  |  | $ 47,600,000 | $ 49,900,000 | 39,900,000 |  |  |
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 |  |  |  | $ 32,600,000 |  |  |  |  |
Natural resources funds |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |
Unfunded commitments for additional investments |  |  |  | $ 10,900,000 |  |  |  |  |
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 Plans |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |
Pension curtailment loss within other comprehensive income (loss) | $ 200,000 |  |  | $ 200,000 | $ 800,000 |  |  |  |
Effective discount rate assumption | 3.86% | 2.96% |  | 3.04% | 2.98% |  | 3.37% | 3.89% |
Increase to underfunded status of the pension plans | $ 4,300,000 |  |  |  | $ (800,000) |  |  |  |
Lump-sum settlement payment |  | $ 154,600,000 |  |  | 156,300,000 |  |  |  |
Settlement gain |  | 2,100,000 |  |  | 2,100,000 |  |  |  |
Benefit to other comprehensive income (loss) |  | $ 79,800,000 |  |  |  |  |  |  |
Accumulated benefit obligation |  |  |  | $ 3,740,000,000 | 3,870,000,000 |  |  |  |
Charge reflecting year-end write-off of actuarial losses |  |  |  | $ 800,000 | $ 44,800,000 | $ 5,100,000 |  |  |
Charge reflecting year-end write-off of actuarial losses percentage |  |  |  | 10.00% | 10.00% | 10.00% |  |  |
Anticipated contributions in fiscal 2022 |  |  |  | $ 12,300,000 |  |  |  |  |
Pension Plans | Facility Closing |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |
Pension curtailment loss within other comprehensive income (loss) |  |  | $ 600,000 |  |  |  |  |  |
Effective discount rate assumption |  |  | 3.13% |  |  |  |  |  | 3.90%
Increase to underfunded status of the pension plans |  |  | $ 12,300,000 |  |  |  |  |  |
Postretirement Plans |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |
Pension curtailment loss within other comprehensive income (loss) |  |  |  |  |  | $ (600,000) |  |  |
Effective discount rate assumption |  |  |  | 2.51% | 2.39% |  |  |  |
Lump-sum settlement payment |  |  |  | $ 300,000 | $ 100,000 |  |  |  |
Settlement gain |  |  |  | 500,000 | $ 200,000 | $ 1,000,000.0 |  |  |
Anticipated contributions in fiscal 2022 |  |  |  | $ 9,000,000.0 |  |  |  |  |

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