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Fair Value - Schedule of Assets and Liabilities Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Aug. 31, 2020
May 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets   $ 2,800
Fair Value, Measurements, Recurring    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets $ 290,161 181
Liabilities 2,966 8,777
Fair Value, Measurements, Recurring | Derivative Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [1] 2,531 181
Liabilities [1] 2,966 8,777
Fair Value, Measurements, Recurring | Investment in Nikola    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [2] 287,630  
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 287,630  
Fair Value, Measurements, Recurring | Quoted Prices In Active Markets (Level 1) | Investment in Nikola    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [2] 287,630  
Fair Value, Measurements, Recurring | Fair Value Inputs Level2    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets 2,531 181
Liabilities 2,966 8,777
Fair Value, Measurements, Recurring | Fair Value Inputs Level2 | Derivative Instruments    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Assets [1] 2,531 181
Liabilities [1] $ 2,966 $ 8,777
[1] The fair value of our derivative instruments is based on the present value of the expected future cash flows considering the risks involved, including non-performance risk, and using discount rates appropriate for the respective maturities.  Market observable, Level 2 inputs are used to determine the present value of the expected future cash flows.  Refer to “NOTE P – Derivative Instruments and Hedging Activities” for additional information regarding our use of derivative instruments.
[2] The fair value of the investment in Nikola is based on the share price of Nikola stock at August 31, 2020.