Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Numerator:
Net income	$ 7,178	$ 2,567	$ 14,982	$ 4,381
Denominator:
Denominator for basic net income (loss) per share - weighted-average outstanding shares (in shares)	12,778	12,544	12,763	12,521
Effect of dilutive securities:
Stock options and restricted stock (in shares)	1,664	1,026	1,605	1,047
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (in shares)	14,442	13,570	14,368	13,568
Net income per share - basic (in dollars per share)	$ 0.56	$ 0.20	$ 1.17	$ 0.35
Net income per share - diluted (in dollars per share)	$ 0.50	$ 0.19	$ 1.04	$ 0.32