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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Earnings Per Share        
Antidilutive potential common shares excluded in computation of diluted loss per share   1,600   1,800
Denominator for basic earnings per share (in shares) 154,852 151,697 154,256 148,214
Potential common shares (in shares) 1,300   1,200  
Denominator for diluted earnings per share (in shares) 156,175 151,697 155,479 148,214