NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Calculation of Basic and Diluted Net Income Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Accounting Policies [Abstract]
Net income (loss)	$ 216	$ (428)	$ (5,295)	$ 9,471
Weighted-average shares outstanding - basic (in shares)	47,017	46,002	46,764	45,625
Common stock equivalents (in shares)	1,290	471	1,028	585
Weighted-average shares outstanding - diluted (in shares)	48,307	46,473	47,792	46,210
Net income (loss) per share:
Basic (in dollars per share)	$ 0.00	$ (0.01)	$ (0.11)	$ 0.21
Diluted (in dollars per share)	$ 0.00	$ (0.01)	$ (0.11)	$ 0.20