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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, 2020
Nov. 30, 2019
Nov. 30, 2020
Nov. 30, 2019
Restricted shares        
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]        
Shares excluded from the calculation of diluted earnings per share 225,500 0 339,550 178,000
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 360,000 0 360,000 790,000