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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2018
Earnings Per Share                      
Denominator for basic earnings per share (in shares) 160,000 160,100 158,600 157,300 157,700 157,400 156,600 156,400 159,005 157,044 159,101
Potential common shares (in shares)                 2,300 2,700 3,200
Denominator for diluted earnings per share (in shares) 160,000 161,800 160,700 160,600 160,900 159,800 158,400 159,600 161,292 159,684 162,261