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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 |

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