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Contingent Liabilities and Commitments - Summary of Progression of Liabilities (Detail) - Tank Replacement Costs
$ in Thousands
12 Months Ended
May 31, 2020
USD ($)
Loss Contingencies [Line Items]  
Beginning balance $ 8,500
Expense 0
Payments (1,271)
Adjustments (2,265)
Ending balance $ 4,964