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Stockholders' Equity - Dividends (Details) - $ / shares
3 Months Ended 6 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2018
Equity [Abstract]          
Cash dividend (in dollars per share) $ 0.1 $ 0.1 $ 0.075 $ 0.075 $ 0.10