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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2016
Mar. 31, 2015
Earnings Per Share        
Antidilutive potential common shares excluded in computation of diluted loss per share       1,900
Denominator for basic earnings per share (in shares) 154,295 151,053 153,957 146,472
Potential common shares (in shares) 1,100 1,700 1,100  
Denominator for diluted earnings per share (in shares) 155,448 152,818 155,131 146,472