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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - $ / shares
3 Months Ended 6 Months Ended
Feb. 22, 2019
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Statement of Stockholders' Equity [Abstract]          
Dividends paid on common stock per share (in dollars per share) $ 0.2 $ 0.2 $ 0.17 $ 0.38 $ 0.32