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Subsequent Events (Details) - $ / shares
12 Months Ended
Aug. 21, 2020
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2018
Subsequent Events        
Dividends declared per share   $ 1.66 $ 1.54 $ 1.36
Subsequent Event        
Subsequent Events        
Dividend declared date Aug. 21, 2020      
Dividends declared per share $ 0.43      
Dividend payable date Sep. 28, 2020      
Dividend record date Sep. 09, 2020