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Debt, Derivatives and Hedging Activities - Narrative (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Feb. 29, 2020 | Feb. 28, 2019 | Feb. 29, 2020 | Feb. 28, 2019 | May 31, 2019 | May 24, 2019 | May 23, 2019
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt, carrying value | $ 2,750,000,000.0 |  | $ 2,750,000,000.0 |  | $ 2,866,200,000 |  |
Debt, fair value | 3,028,500,000 |  | 3,028,500,000 |  | 2,998,700,000 |  |
(Payments) issuance of commercial paper, net |  |  | (112,500,000) | $ 217,500,000 |  |  |
Debt due within one year | 199,800,000 |  | 199,800,000 |  | 312,264,000 |  |
Amortization of interest rate lock agreements - increase (decrease) to other comprehensive income | (400,000) | $ (300,000) | (1,000,000.0) | $ (900,000) |  |  |
Treasury Lock |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Notional amount | 700,000,000.0 |  | 700,000,000.0 |  | 500,000,000.0 |  |
Interest rate lock asset | 27,100,000 |  | 27,100,000 |  |  |  |
Interest rate lock liability | $ 89,800,000 |  | $ 89,800,000 |  | 36,400,000 |  |
Term loan due 2020 |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Variable borrowing rate | 2.25% |  | 2.25% |  |  |  |
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 |  | 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 |
Annual extension term |  |  | 12 months |  |  |  |
Extension term |  |  | 4 years |  |  |  |
Credit agreement |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
Debt amendment, increase limit (up to) |  |  |  |  |  | $ 250,000,000.0 |
Commercial paper |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |
(Payments) issuance of commercial paper, net |  |  | $ (112,500,000) |  |  |  |
Debt due within one year |  |  |  |  | $ 112,500,000 |  |
Variable borrowing rate |  |  |  |  | 2.68% |  |

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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=119400593&loc=d3e572229-122910 + Details
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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19,20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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