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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share    
Denominator for basic earnings per share (in shares) 157,909 154,255
Potential common shares (in shares) 3,900 3,700
Denominator for diluted earnings per share (in shares) 161,847 157,993