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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