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Nature of Operations and Summary of Significant Accounting Policies - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Mar. 31, 2023
Mar. 31, 2022
Accounting Policies [Abstract]        
Net income $ 5,169 $ 435 $ 9,899 $ 3,559
Weighted-average shares outstanding - basic (in shares) 45,377 44,775 45,317 44,795
Common stock equivalents (in shares) 403 1,322 615 1,411
Weighted-average shares outstanding - diluted (in shares) 45,780 46,097 45,932 46,206
Net income per share:        
Basic (in dollars per share) $ 0.11 $ 0.01 $ 0.22 $ 0.08
Diluted (in dollars per share) $ 0.11 $ 0.01 $ 0.22 $ 0.08