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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 9 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Earnings Per Share        
Potential common shares excluded due to antidilutive effect 1,300      
Denominator for basic earnings per share 138,741 140,608 138,785 141,149
Potential common shares   1,600 1,500 2,000
Denominator for diluted earnings per share 138,741 142,178 140,339 143,147