Earnings Per Share - Reconciliation of Components of Basic and Diluted EPS Calculations (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands		3 Months Ended		9 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Numerator:
Net income		$ 10,222	$ 369	$ 13,184	$ 842
Denominator:
Weighted-average shares used to compute basic EPS		13,889	14,176	14,042	14,163
Common stock equivalents	[1]	137	197	178	129
Weighted-average shares used to compute diluted EPS		14,026	14,373	14,220	14,292
Net income per basic share		$ 0.74	$ 0.03	$ 0.94	$ 0.06
Net income per diluted share		$ 0.73	$ 0.03	$ 0.93	$ 0.06

[1] The number of common stock equivalents is calculated using the treasury method and the average market price during the period.