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, 2024	Mar. 31, 2023	Mar. 31, 2024	Mar. 31, 2023
Accounting Policies [Abstract]
Net income (loss)	$ 282	$ 5,169	$ (5,511)	$ 9,899
Weighted-average shares outstanding - basic (in shares)	46,896	45,377	46,593	45,317
Common stock equivalents (in shares)	1,145	403	0	615
Weighted-average shares outstanding - diluted (in shares)	48,041	45,780	46,593	45,932
Net income (loss) per share:
Net income (loss) per share – basic (in dollars per share)	$ 0.01	$ 0.11	$ (0.12)	$ 0.22
Net income (loss) per share - diluted (in dollars per share)	$ 0.01	$ 0.11	$ (0.12)	$ 0.22