Derivative Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($) $ in Thousands	Feb. 28, 2021	May 31, 2020
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 60,036	$ 181
Liability Derivatives at Fair Value	9,805	8,777
Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	42,602	79
Liability Derivatives at Fair Value	1	4,773
Derivatives Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value		4,294
Derivatives Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	42,578
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	24	79
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	1	479
Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value		102
Liability Derivatives at Fair Value	226	4,004
Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Asset Derivatives at Fair Value	17,434	96
Liability Derivatives at Fair Value	9,578	4,004
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	9,567	3,826
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	17,426
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	8	96
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	11	178
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	100
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value		$ 6
Derivatives Not Designated As Hedging Instruments | Long Term Foreign Currency Exchange Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	$ 126