Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Numerator:
Net income	$ 7,804	$ 1,814
Denominator:
Denominator for basic net income (loss) per share - weighted-average outstanding shares (in shares)	12,749	12,498
Effect of dilutive securities:
Stock options and restricted stock (in shares)	1,546	947
Denominator for diluted net income (loss) per share - weighted-average outstanding shares (in shares)	14,295	13,445
Net income per share - basic (in dollars per share)	$ 0.61	$ 0.15
Net income per share - diluted (in dollars per share)	$ 0.55	$ 0.13