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Earnings Per Share (Details) - shares
shares in Thousands
3 Months Ended 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Earnings Per Share [Abstract]        
Basic weighted average shares outstanding 62,026 63,934 62,022 64,264
Dilutive effect of unvested RSUs 268 191 190 182
Denominator for diluted earnings per share 62,294 64,125 62,212 64,446
Antidilutive securities excluded from computation of earnings per share (in shares) 200 300 200 300