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, 2025	Jun. 30, 2024	Jun. 30, 2025	Jun. 30, 2024
Accounting Policies [Abstract]
Net income (loss)	$ 2,396	$ 216	$ 6,936	$ (5,295)
Weighted-average shares outstanding - basic (in shares)	45,894	47,017	45,632	46,764
Common stock equivalents (in shares)	954	1,290	1,158	1,028
Weighted-average shares outstanding - diluted (in shares)	46,848	48,307	46,790	47,792
Net income (loss) per share:
Basic (in dollars per share)	$ 0.05	$ 0.00	$ 0.15	$ (0.11)
Diluted (in dollars per share)	$ 0.05	$ 0.00	$ 0.15	$ (0.11)