Derivative Instruments and Hedging Activities - Schedule of Fair Value of Derivative Instruments (Detail) - USD ($) $ in Thousands	May 31, 2019	May 31, 2018
Derivative [Line Items]
Asset Derivatives at Fair Value	$ 2,414	$ 11,423
Liability Derivatives at Fair Value	12,238	846
Designated as Hedging Instrument
Derivative [Line Items]
Asset Derivatives at Fair Value	5	6,453
Liability Derivatives at Fair Value	8,584
Designated as Hedging Instrument | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	201
Designated as Hedging Instrument | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	5	6,385
Designated as Hedging Instrument | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value		68
Designated as Hedging Instrument | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	8,383
Derivatives Not Designated As Hedging Instruments
Derivative [Line Items]
Asset Derivatives at Fair Value	2,409	4,970
Liability Derivatives at Fair Value	3,654	846
Derivatives Not Designated As Hedging Instruments | Commodity Contracts
Derivative [Line Items]
Asset Derivatives at Fair Value	2,409	4,970
Liability Derivatives at Fair Value	3,634	771
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Liabilities
Derivative [Line Items]
Liability Derivatives at Fair Value	66	158
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Receivables
Derivative [Line Items]
Asset Derivatives at Fair Value	2,347	4,749
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Other Assets
Derivative [Line Items]
Asset Derivatives at Fair Value	62	221
Derivatives Not Designated As Hedging Instruments | Commodity Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	3,568	613
Derivatives Not Designated As Hedging Instruments | Foreign Currency Exchange Contracts | Accounts Payable
Derivative [Line Items]
Liability Derivatives at Fair Value	$ 20	$ 75