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Earnings Per Share
 9 Months Ended
Jun. 30, 2021
Earnings Per Share [Abstract]  
Earnings Per Share Earnings Per ShareThe weighted average number of shares outstanding used to compute earnings per share was as follows:
 Three Months Ended June 30,Nine Months Ended June 30,
(shares in thousands)2021202020212020
Basic weighted average shares outstanding62,064 61,882 62,028 63,463 
Dilutive effect of unvested RSUs389 220 272 203 
Denominator for diluted earnings per share62,453 62,102 62,300 63,666 
Our dilutive earnings per share for the three and nine months ended June 30, 2021 excludes the effect from approximately 0.1 million and 0.2 million unvested restricted stock units, respectively, as adding them to our calculation would be antidilutive. Our diluted earnings per share for the three and nine months ended June 30, 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.