Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($)	3 Months Ended		6 Months Ended
	Nov. 30, 2020	Nov. 30, 2019	Nov. 30, 2020	Nov. 30, 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		$ 2,550,000,000.0
Debt, fair value	2,829,200,000		2,829,200,000		2,804,200,000
Amortization of interest rate lock agreements - increase (decrease) to other comprehensive loss	(400,000)	$ (400,000)	(700,000)	$ (700,000)
Unrecognized inventory purchase commitments	35,800,000		35,800,000		117,600,000
Unrecognized inventory purchase commitments, additions			25,600,000
Inventory purchases related to unrecognized commitments			107,400,000
Treasury Lock Tranche 2
Debt Instrument [Line Items]
Notional amount					950,000,000.0
Interest rate lock asset	9,800,000		9,800,000		1,500,000
Interest rate lock liability	38,300,000		38,300,000		53,800,000
Treasury Lock Tranche 1
Debt Instrument [Line Items]
Notional amount						$ 500,000,000.0
Interest rate lock liability	99,800,000		99,800,000		111,900,000
Commercial paper
Debt Instrument [Line Items]
Debt due within one year	0		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
Debt amendment, increase limit (up to)							250,000,000.0
Revolving credit facility amount outstanding	$ 0		$ 0		$ 0
Revolving credit facility | Term loan
Debt Instrument [Line Items]
Revolving credit facility, maximum borrowing capacity with accordion feature							$ 200,000,000.0