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Earnings per share
 12 Months Ended
Sep. 30, 2020
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:
 Year ended September 30,
(in thousands)202020192018
Weighted average shares outstanding63,062 64,498 65,501 
Dilutive effect of unvested restricted stock awards260 322 431 
Denominator for diluted earnings per share63,322 64,820 65,932 
For the years ended September 30, 2020, 2019 and 2018, we excluded approximately 215,000, 10,000 and 5,000 unvested restricted stock units, respectively, from the calculation of diluted earnings per share as the effect of including them, was anti-dilutive.