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Subsequent Events - Cash Dividends (Details) - $ / shares
12 Months Ended
Aug. 01, 2018
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2016
Subsequent Event [Line Items]        
Dividends declared per common share (in dollars per share)   $ 0.5478 $ 0.477000 $ 0.4150
Subsequent Event        
Subsequent Event [Line Items]        
Dividends declared per common share (in dollars per share) $ 0.1518