Debt and Derivatives - Interest Rate Lock Agreements (Details) - USD ($) $ in Thousands	May 31, 2021	May 31, 2020	May 31, 2019
Interest Rate Contract, 2020
Derivatives, Fair Value [Line Items]
Derivative notional amount	$ 950,000	$ 950,000
Interest Rate Contract, 2019
Derivatives, Fair Value [Line Items]
Derivative notional amount	500,000		$ 500,000
Other assets, net | Interest Rate Contract, 2020
Derivatives, Fair Value [Line Items]
Derivative assets	40,400	1,546
Other assets, net | Interest Rate Contract, 2019
Derivatives, Fair Value [Line Items]
Derivative assets	0	0
Long-term accrued liabilities | Interest Rate Contract, 2020
Derivatives, Fair Value [Line Items]
Derivative liabilities	0	53,817
Long-term accrued liabilities | Interest Rate Contract, 2019
Derivatives, Fair Value [Line Items]
Derivative liabilities	$ 61,657	$ 111,869