Fair Value Measurement - Recurring Fair Value Measurements (Details) - USD ($) $ in Thousands	Nov. 30, 2019	May 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	$ 63,809	$ 87,533
Deferred Compensation Plan Assets	5,682	4,984
Derivative assets	53,174	41,179
Derivative liabilities	591,027	391,724
Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	63,809	87,533
Deferred Compensation Plan Assets	5,682	4,984
Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	53,174	41,179
Derivative liabilities	591,027	391,724
Recurring basis
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	63,809	87,533
Deferred Compensation Plan Assets	5,682	4,984
Derivative assets	53,174	41,179
Derivative liabilities	591,027	391,724
Recurring basis | Level 1
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities	63,809	87,533
Deferred Compensation Plan Assets	5,682	4,984
Recurring basis | Level 2
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative assets	53,174	41,179
Derivative liabilities	$ 591,027	$ 391,724