Derivative Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($) $ in Thousands	May 31, 2020	May 31, 2019
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 181	$ 2,414
Liability Derivatives at Fair Value	8,777	12,238
Derivatives Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	79	5
Liability Derivatives at Fair Value	4,773	8,584
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	479	201
Derivatives Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value		5
Derivatives Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	79
Derivatives Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	4,294	8,383
Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	102	2,409
Liability Derivatives at Fair Value	4,004	3,654
Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Asset Derivatives at Fair Value	96	2,409
Liability Derivatives at Fair Value	4,004	3,634
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	178	66
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value		2,347
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	96	62
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	3,826	3,568
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 | Foreign Currency Exchange Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value		$ 20