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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jan. 31, 2020 | Feb. 28, 2021 | Feb. 23, 2020 | Aug. 25, 2019 | Feb. 28, 2021 | Feb. 23, 2020 | May 30, 2021 | Dec. 31, 2019 | Nov. 24, 2019 | May 27, 2019
Pension Benefits |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |
Effective discount rate assumption | 3.86% |  | 2.96% |  |  | 2.96% |  | 3.37% | 3.89% |
Pension curtailment loss within other comprehensive income (loss) | $ 0.2 | $ 0.0 | $ 0.2 |  | $ 0.0 | $ 0.8 |  |  |  |
Increase to underfunded status of the pension plans | $ 4.3 |  |  |  |  |  |  |  |  |
Lump-sum settlement payment |  |  | 154.6 |  |  |  |  |  |  |
Settlement gain |  | 0.0 | 2.1 |  | 0.0 | $ 2.1 |  |  |  |
Benefit to other comprehensive income (loss) |  |  | $ 79.8 |  |  |  |  |  |  |
Employer contributions to pension and other postretirement plans |  | 3.0 |  |  | 23.7 |  |  |  |  |
Anticipated further contributions for the remainder of fiscal 2021 |  | 8.5 |  |  | 8.5 |  |  |  |  |
Pension Benefits | Scenario, Forecast |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |
Weighted average discount rate for service costs |  |  |  |  |  |  | 3.35% |  |  |
Weighted average discount rate for interest costs |  |  |  |  |  |  | 2.30% |  |  |
Pension Benefits | Facility Closing |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |
Effective discount rate assumption |  |  |  | 3.13% |  |  |  |  |  | 3.90%
Pension curtailment loss within other comprehensive income (loss) |  |  |  | $ 0.6 |  |  |  |  |  |
Increase to underfunded status of the pension plans |  |  |  | $ 12.3 |  |  |  |  |  |
Postretirement Benefits |  |  |  |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |  |  |  |  |  |  |
Employer contributions to pension and other postretirement plans |  | 2.0 |  |  | 6.1 |  |  |  |  |
Anticipated further contributions for the remainder of fiscal 2021 |  | $ 3.9 |  |  | $ 3.9 |  |  |  |  |

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