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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Mar. 31, 2017
Mar. 31, 2016
Earnings Per Share        
Denominator for basic earnings per share (in shares) 155,366 154,295 154,810 153,957
Potential common shares (in shares) 3,300 1,100 3,500 1,100
Denominator for diluted earnings per share (in shares) 158,650 155,448 158,322 155,131