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PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Feb. 24, 2019 | Feb. 25, 2018 | Feb. 24, 2019 | Feb. 25, 2018
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Net liability related to pension and postretirement plans | $ 34.8 |  | $ 34.8 |
(Benefit) expense recorded related to expected incurrence of multi-employer pension plan withdrawal costs |  | $ (1.7) |  | $ 0.4
Pension Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Weighted average discount rate for service costs |  |  | 4.21% |
Weighted average discount rate for interest costs |  |  | 3.83% |
Employer contributions to pension and other postretirement plans | 3.6 |  | $ 11.5 |
Anticipated further contributions for the remainder of fiscal 2018 | 3.0 |  | 3.0 |
Postretirement Benefits |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items] |  |  |  |
Employer contributions to pension and other postretirement plans | 2.0 |  | 6.3 |
Anticipated further contributions for the remainder of fiscal 2018 | $ 9.9 |  | $ 9.9 |

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