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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Earnings Per Share                      
Denominator for basic earnings per share 143,800 146,100 147,800 151,400 160,000 160,100 158,600 157,300 147,279 159,005 157,044
Potential common shares                 2,400 2,300 2,700
Denominator for diluted earnings per share 146,600 148,900 149,500 153,700 160,000 161,800 160,700 160,600 149,676 161,292 159,684