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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Nov. 29, 2020 | Nov. 24, 2019 | Aug. 25, 2019 | Nov. 29, 2020 | Nov. 24, 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 | $ 0.0 |  | $ 0.0 | $ 0.6 |  |
Employer contributions to pension and other postretirement plans | 14.8 |  |  | 20.7 |  |  |
Anticipated further contributions for the remainder of fiscal 2021 | 11.5 |  |  | 11.5 |  |  |
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 | 1.8 |  |  | 4.1 |  |  |
Anticipated further contributions for the remainder of fiscal 2021 | $ 5.9 |  |  | $ 5.9 |  |  |

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- Definition Weighted average rate for present value of future retirement benefits cash flows, used to determine benefit obligation of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 + Details
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