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Earnings Per Share
 6 Months Ended
Mar. 31, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per Share
The weighted average number of shares outstanding used to compute earnings per share was as follows:
 Three Months Ended March 31,Six Months Ended March 31,
(shares in thousands)2021202020212020
Basic weighted average shares outstanding62,026 63,934 62,022 64,264 
Dilutive effect of unvested RSUs268 191 190 182 
Denominator for diluted earnings per share62,294 64,125 62,212 64,446 
Our diluted earnings per share for the three and six months ended March 31, 2020, excludes any effect from approximately 0.3 million and 0.3 million unvested restricted stock units, respectively, as adding them to our calculation would have been antidilutive. Our dilutive earnings per share for the three and six months ended March 31, 2021, excludes any effect from approximately 0.2 million and 0.2 million unvested restricted stock units, respectively, as adding them to our calculation would be antidilutive.