Quarterly report pursuant to Section 13 or 15(d)

Consolidated Statements of Stockholders' Equity (Parenthetical)

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Consolidated Statements of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Nov. 30, 2019
Nov. 30, 2018
Nov. 30, 2019
Nov. 30, 2018
Consolidated Statements of Stockholders' Equity [Abstract]        
Cash dividends per share $ 0.62 $ 0.56 $ 1.24 $ 1.12