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Contingencies and Accrued Losses - Additional Information (Detail) - USD ($) |  | 3 Months Ended | 6 Months Ended
--- | --- | --- | ---
Dec. 22, 2020 | Nov. 30, 2020 | Nov. 30, 2019 | Feb. 28, 2013 | Nov. 30, 2012 | Aug. 31, 2012 | Nov. 30, 2020 | Nov. 30, 2019
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income due to restatement effect |  | $ 127,659,000 | $ 77,030,000 |  |  |  | $ 308,254,000 | $ 183,218,000
Subsequent Event |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Penalty to be paid | $ 2,000,000.0 |  |  |  |  |  |  |
Subsequent Event | General Counsel |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Penalty to be paid | $ 22,500 |  |  |  |  |  |  |
Restatements |  |  |  |  |  |  |  |
Error Corrections And Prior Period Adjustments Restatement [Line Items] |  |  |  |  |  |  |  |
Increase (decrease) in net income due to restatement effect |  |  |  | $ 18,000,000.0 | $ (10,800,000) | $ (7,200,000) |  |

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