Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended
	Aug. 31, 2020	Aug. 31, 2019	May 31, 2020	May 31, 2019	May 24, 2019	May 23, 2019
Debt Instrument [Line Items]
Debt, carrying value	$ 2,550,000,000.0		$ 2,550,000,000.0
Debt, fair value	2,840,200,000		2,804,200,000
Debt due within one year	249,808,000		0
Amortization of interest rate lock agreements - increase (decrease) to other comprehensive income	(400,000)	$ (300,000)
Unrecognized inventory purchase commitments	64,400,000		117,600,000
Unrecognized inventory purchase commitments, additions	9,800,000
Inventory purchases related to unrecognized commitments	62,500,000
Treasury Lock Tranche 1
Debt Instrument [Line Items]
Notional amount				$ 500,000,000.0
Interest rate lock liability	107,800,000		111,900,000
Treasury Lock Tranche 2
Debt Instrument [Line Items]
Notional amount	950,000,000.0
Interest rate lock asset	6,400,000		1,500,000
Interest rate lock liability	48,200,000		53,800,000
Commercial paper
Debt Instrument [Line Items]
Debt due within one year	0		0
Revolving credit facility
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature					$ 1,000,000,000.0	$ 600,000,000.0
Revolving credit facility amount outstanding	$ 0		$ 0
Revolving credit facility | Term loan due 2020
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature					200,000,000.0
Credit agreement
Debt Instrument [Line Items]
Debt amendment, increase limit (up to)					$ 250,000,000.0