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Contingencies and Accrued Losses - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Aug. 31, 2020
Aug. 31, 2019
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
Error Corrections And Prior Period Adjustments Restatement [Line Items]          
Increase (decrease) in net income due to restatement effect $ 180,595 $ 106,188      
Restatements          
Error Corrections And Prior Period Adjustments Restatement [Line Items]          
Increase (decrease) in net income due to restatement effect     $ 18,000 $ (10,800) $ (7,200)