NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Schedule of Calculation of Basic and Diluted Net Income (Loss) per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	12 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2023
Accounting Policies [Abstract]
Net income	$ 8,796	$ 3,278	$ 8,027
Weighted-average shares outstanding - basic (in shares)	45,716	46,560	45,533
Common stock equivalents (in shares)	1,210	908	928
Weighted-average shares outstanding - diluted (in shares)	46,926	47,468	46,461
Net income per share:
Basic (in dollars per share)	$ 0.19	$ 0.07	$ 0.18
Diluted (in dollars per share)	$ 0.19	$ 0.07	$ 0.17