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PENSION AND POSTRETIREMENT BENEFITS (Details) $ in Millions | 3 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | ---
May 31, 2026 USD ($) | May 25, 2025 USD ($) | Feb. 25, 2024 USD ($) | May 31, 2026 USD ($) | May 25, 2025 USD ($) item | May 26, 2024 USD ($) | Dec. 31, 2023 | Dec. 30, 2023
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Noncash pre-tax settlement gain |  |  | $ 6.8 |  |  |  |  |
Defined Benefit Plan, Recognized Net Actuarial Gain (Loss), Percentage |  |  |  | 10.00% |  |  |  |
Fair Value Investments Ability To Impose Customary Redemption Gates | $ 21.9 |  |  | $ 21.9 |  |  |  |
Fair Value Investments Impose Customary Redemption Gates | $ 0.0 |  |  | $ 0.0 |  |  |  |
Percentage Providing More Than Plans Contribution |  |  |  | 5.00% |  |  |  |
Defined Contribution Plan, Cost |  |  |  | $ 65.3 | $ 66.7 | $ 62.3 |  |
Maximum [Member] |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Red Zone Multiemployer Plans Funded Percentage |  |  |  | 65.00% |  |  |  |
Yellow Zone Multiemployer Plans Funded Percentage | 80.00% |  |  | 80.00% |  |  |  |
Minimum [Member] |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Green Zone Multiemployer Plan Funded Percentage | 80.00% |  |  | 80.00% |  |  |  |
Private Equity Funds [Member] |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Unfunded Commitment For Additional Investment | $ 32.0 |  |  | $ 32.0 |  |  |  |
Natural Resources Funds [Member] |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Unfunded Commitment For Additional Investment | $ 5.4 |  |  | $ 5.4 |  |  |  |
Fixed Income Securities [Member] |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 90.00% |  |  | 90.00% |  |  |  |
Defined Benefit Plan, Equity Securities [Member] |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Defined Benefit Plan, Plan Assets, Target Allocation, Percentage | 10.00% |  |  | 10.00% |  |  |  |
Pension plan |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Defined benefit plan benefit obligation transfer amount |  |  |  | $ 40.3 | $ 760.6 |  |  |
Number of retired participants | item |  |  |  |  | 22,000 |  |  |
Amount of increase in in plan assets |  |  |  |  | $ 678.3 |  |  |
Actuarial gain |  |  |  |  | 82.3 |  |  |
Noncash pre-tax settlement gain | $ (2.7) | $ 13.0 |  | $ (2.7) | $ 13.0 |  |  |
Defined benefit plan, settlement, payment and plan of assets |  |  | $ 135.0 |  |  |  |  |
Discount rate | 5.65% | 5.91% |  | 5.65% | 5.91% |  | 5.20% | 5.52%
Employer contributions |  |  |  | $ 11.4 | $ 11.9 |  |  |
Contributions, next fiscal year | $ 10.3 |  |  | 10.3 |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | (66.5) | 148.6 |  |  |
Defined Benefit Plan, Accumulated Benefit Obligation | $ 1,680.0 | $ 1,690.0 |  | 1,680.0 | 1,690.0 |  |  |
Defined Benefit Plan Recognized Net Actuarial Gain Loss |  |  |  | $ 25.2 | $ 3.5 | $ 12.5 |  |
Other postretirement benefits plan |  |  |  |  |  |  |  |
PENSION AND POSTRETIREMENT BENEFITS |  |  |  |  |  |  |  |
Discount rate | 5.32% | 5.43% |  | 5.32% | 5.43% |  |  |
Employer contributions |  |  |  | $ 5.9 | $ 6.7 |  |  |
Contributions, next fiscal year | $ 6.1 |  |  | 6.1 |  |  |  |
Defined Benefit Plan, Benefit Obligation, Actuarial Gain (Loss) |  |  |  | $ 0.4 | $ (4.4) |  |  |

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