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Unaudited Consolidated Statement of Stockholders' Equity (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Nov. 30, 2019
Dec. 01, 2018
Nov. 30, 2019
Dec. 01, 2018
Common Class B        
Dividends per common share $ 0.054 $ 0.054 $ 0.108 $ 0.108
Common Stock        
Dividends per common share $ 0.06 $ 0.06 $ 0.120 $ 0.120