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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Earnings Per Share                      
Denominator for basic earnings per share (in shares) 158,600 160,400 159,500 157,900 157,500 155,800 155,400 154,300 159,101 155,728 154,772
Potential common shares (in shares)                 3,200 3,400 1,300
Denominator for diluted earnings per share (in shares) 161,800 163,200 159,500 161,800 161,100 158,800 158,700 158,000 162,261 159,135 156,073