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		6 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2025	Mar. 31, 2024
Accounting Policies [Abstract]
Net income (loss)	$ 9,152	$ 282	$ 4,540	$ (5,511)
Weighted-average shares outstanding - basic (in shares)	45,651	46,896	45,501	46,593
Common stock equivalents (in shares)	959	1,145	1,098	0
Weighted-average shares outstanding - diluted (in shares)	46,610	48,041	46,599	46,593
Net income (loss) per share:
Basic (in dollars per share)	$ 0.20	$ 0.01	$ 0.10	$ (0.12)
Diluted (in dollars per share)	$ 0.20	$ 0.01	$ 0.10	$ (0.12)