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Dividend (Detail) - $ / shares
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
Equity [Abstract]        
Common Stock, Dividends, Per Share, Cash Paid $ 0.15      
Dividends per share $ 0.15 $ 0.11 $ 0.30 $ 0.22