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PENSION AND POSTRETIREMENT BENEFITS - Components of pension and postretirement plan costs (benefits) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Aug. 24, 2025 | Aug. 25, 2024
Pension plan |  |
PENSION AND POSTRETIREMENT BENEFITS |  |
Service cost | $ 1.4 | $ 1.4
Interest cost | 22.0 | 34.0
Expected return on plan assets | (27.8) | (36.6)
Amortization of prior service cost (benefit) | 0.4 | 0.4
Total pension and postretirement cost (benefit) | (1.7) | 1.4
Pension plan | Company plans |  |
PENSION AND POSTRETIREMENT BENEFITS |  |
Total pension and postretirement cost (benefit) | 4.0 | 0.8
Pension plan | Multi employer plan |  |
PENSION AND POSTRETIREMENT BENEFITS |  |
Total pension and postretirement cost (benefit) | 2.3 | 2.2
Other postretirement benefits plan |  |
PENSION AND POSTRETIREMENT BENEFITS |  |
Interest cost | 0.6 | 0.6
Amortization of prior service cost (benefit) | (0.4) | (0.4)
Recognized net actuarial gain | (0.9) | (1.1)
Total pension and postretirement cost (benefit) | $ (0.7) | $ (0.9)

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