PENSION AND POSTRETIREMENT BENEFITS - Narrative (Details) - USD ($)		3 Months Ended		12 Months Ended
	Jan. 31, 2020	Feb. 23, 2020	Aug. 25, 2019	May 30, 2021	May 31, 2020	May 26, 2019	Dec. 31, 2019	Nov. 24, 2019	May 27, 2019
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Fair value of certain investments				$ 52,200,000
Fair value of funds which have imposed such gates				0
Expense related to expected incurrence of certain multi-employer plan withdrawal costs						$ 300,000
Expense related to defined contribution plans				$ 47,600,000	$ 49,900,000	39,900,000
Maximum
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Maximum allowable funding percentage to be in critical status				65.00%
Maximum allowable funding percentage to be in endangered status				80.00%
Minimum
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Minimum required funding percentage to be in the green zone				80.00%
Percentage of plan's total contribution under Forms 5500 (more than)				5.00%
Private equity funds
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Unfunded commitments for additional investments				$ 32,600,000
Natural resources funds
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Unfunded commitments for additional investments				$ 10,900,000
Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target allocation (percent)				90.00%
Return seeking securities
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Target allocation (percent)				10.00%
Pension Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension curtailment loss within other comprehensive income (loss)	$ 200,000			$ 200,000	$ 800,000
Effective discount rate assumption	3.86%	2.96%		3.04%	2.98%		3.37%	3.89%
Increase to underfunded status of the pension plans	$ 4,300,000				$ (800,000)
Lump-sum settlement payment		$ 154,600,000			156,300,000
Settlement gain		2,100,000			2,100,000
Benefit to other comprehensive income (loss)		$ 79,800,000
Accumulated benefit obligation				$ 3,740,000,000	3,870,000,000
Charge reflecting year-end write-off of actuarial losses				$ 800,000	$ 44,800,000	$ 5,100,000
Charge reflecting year-end write-off of actuarial losses percentage				10.00%	10.00%	10.00%
Anticipated contributions in fiscal 2022				$ 12,300,000
Pension Plans | Facility Closing
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension curtailment loss within other comprehensive income (loss)			$ 600,000
Effective discount rate assumption			3.13%						3.90%
Increase to underfunded status of the pension plans			$ 12,300,000
Postretirement Plans
Defined Benefit Plans and Other Postretirement Benefit Plans [Line Items]
Pension curtailment loss within other comprehensive income (loss)						$ (600,000)
Effective discount rate assumption				2.51%	2.39%
Lump-sum settlement payment				$ 300,000	$ 100,000
Settlement gain				500,000	$ 200,000	$ 1,000,000.0
Anticipated contributions in fiscal 2022				$ 9,000,000.0