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Earnings Per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
Sep. 30, 2021
Jun. 30, 2021
Mar. 31, 2021
Dec. 31, 2020
Sep. 30, 2020
Jun. 30, 2020
Mar. 31, 2020
Dec. 31, 2019
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Numerator:                      
Net income (loss) $ 32,756 $ 8,419 $ 5,260 $ 4,514 $ 5,447 $ 213 $ (4,238) $ (5,196) $ 50,949 $ (3,774) $ (19,260)
Denominator:                      
Basic weighted average shares outstanding 33,297,879 33,371,906 33,491,395 33,176,895 33,584,040 33,695,936 33,624,889 33,545,235 33,333,557 33,612,263 33,062,976
Dilutive impact of stock options, RSUs and RSAs (in shares)                 1,690,551 0 0
Diluted weighted average shares outstanding 35,294,326 35,437,761 35,559,747 34,911,119 33,986,862 33,815,332 33,624,889 33,545,235 35,024,108 33,612,263 33,062,976
Basic income (loss) per common share (in dollars per share) $ 0.98 $ 0.25 $ 0.16 $ 0.14 $ 0.16 $ 0.01 $ (0.13) $ (0.15) $ 1.53 $ (0.11) $ (0.58)
Diluted income (loss) per common share (in usd per share) $ 0.93 $ 0.24 $ 0.15 $ 0.13 $ 0.16 $ 0.01 $ (0.13) $ (0.15) $ 1.45 $ (0.11) $ (0.58)
Stock options, RSUs and RSAs excluded from income (loss) per diluted share because their effect would have been anti-dilutive                 420,454 3,526,055 4,621,199