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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Aug. 30, 2020 | Aug. 25, 2019 | May 30, 2021 | May 27, 2019
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Pension curtailment loss within other comprehensive income (loss) | $ 0.0 | $ 0.6 |  |
Employer contributions to pension and other postretirement plans | 5.9 |  |  |
Anticipated further contributions for the remainder of fiscal 2021 | 26.3 |  |  |
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 | 2.3 |  |  |
Anticipated further contributions for the remainder of fiscal 2021 | $ 7.7 |  |  |

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