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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Mar. 31, 2019
Mar. 31, 2018
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) 156,621 159,495 156,519 158,702
Potential common shares (in shares) 1,800   2,500  
Denominator for diluted earnings per share (in shares) 158,416 159,495 159,010 158,702