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Subsequent Events (Details) - $ / shares
3 Months Ended 6 Months Ended
May 21, 2018
May 10, 2018
Apr. 17, 2018
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Subsequent Event [Line Items]              
Dividends declared, in dollars per share       $ 0.05 $ 0.04 $ 0.09 $ 0.07
Subsequent Event [Member]              
Subsequent Event [Line Items]              
Dividends Payable, Date Declared     Apr. 17, 2018        
Dividends declared, in dollars per share     $ 0.0500        
Dividends Payable, Date to be Paid May 21, 2018            
Dividends Payable, Date of Record   May 10, 2018