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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Mar. 31, 2018
Mar. 31, 2017
Earnings Per Share        
Antidilutive potential common shares excluded in computation of diluted loss per share 2,700   3,300  
Denominator for basic earnings per share (in shares) 159,495 155,366 158,702 154,810
Potential common shares (in shares)   3,300   3,500
Denominator for diluted earnings per share (in shares) 159,495 158,650 158,702 158,322