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Reconciliation of Numerator and Denominator of Basic and Diluted Earnings Per Share (Parenthetical) (Detail) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Nov. 30, 2021
Nov. 30, 2020
Nov. 30, 2021
Nov. 30, 2020
Restricted shares        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted earnings per share 0 225,500 0 339,550
Stock appreciation rights (SARs)        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted earnings per share 660,000 360,000 660,000 360,000