DERIVATIVE FINANCIAL INSTRUMENTS - Narrative (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Nov. 25, 2018	Feb. 27, 2022	Feb. 28, 2021	Feb. 27, 2022	Feb. 28, 2021	Nov. 28, 2021	Aug. 29, 2021	May 30, 2021	Nov. 29, 2020	Aug. 30, 2020	May 31, 2020
Derivative Instruments, Gain (Loss) [Line Items]
Period to hedge portion of anticipated consumption of commodity inputs (up to)				36 months
Gain recognized in other comprehensive income		$ 2.1	$ 0.6	$ 1.8	$ 1.1
Deferred gain in AOCI upon settlement of contracts		8,853.3	$ 8,329.8	8,853.3	$ 8,329.8	$ 8,756.9	$ 8,635.9	$ 8,631.4	$ 8,469.5	$ 8,199.0	$ 7,950.7
Setoff amounts applied against total derivative assets		11.7		11.7				7.4
Setoff amounts applied against total derivative liabilities		10.0		10.0				5.4
Level 2
Derivative Instruments, Gain (Loss) [Line Items]
Maximum amount of loss due to credit risk of counterparties		0.7		0.7
Prepaid expenses and other current assets
Derivative Instruments, Gain (Loss) [Line Items]
Amount representing obligation to return cash		1.7		1.7				2.0
Cash flow hedge, Pinnacle
Derivative Instruments, Gain (Loss) [Line Items]
Gain recognized in other comprehensive income	$ 47.5
Commodity contracts | Purchase contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional value of contracts		123.3		123.3				148.8
Commodity contracts | Sales contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional value of contracts		154.5		154.5				159.4
Foreign currency forward contracts
Derivative Instruments, Gain (Loss) [Line Items]
Notional value of contracts		88.2		88.2				111.4
Cash flow hedges
Derivative Instruments, Gain (Loss) [Line Items]
Deferred gain in AOCI upon settlement of contracts		24.9		24.9				$ 24.3
Cash flow hedges | Cash flow hedge, Pinnacle
Derivative Instruments, Gain (Loss) [Line Items]
Deferred gain in AOCI upon settlement of contracts		$ 35.8		$ 35.8