GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2023	Sep. 30, 2022
Acquired Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100,961	$ 100,961
Accumulated Amortization	37,171	33,807
Net	$ 63,790	67,154
Developed technology
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	15 years
Gross Carrying Amount	$ 89,096	89,096
Accumulated Amortization	31,115	28,137
Net	$ 57,981	60,959
Intellectual property
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	13 years
Gross Carrying Amount	$ 2,000	2,000
Accumulated Amortization	423	328
Net	$ 1,577	1,672
Trade name
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	20 years
Gross Carrying Amount	$ 5,865	5,865
Accumulated Amortization	1,633	1,475
Net	$ 4,232	4,390
Customer relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	5 years
Gross Carrying Amount	$ 4,000	4,000
Accumulated Amortization	4,000	3,867
Net	$ 0	$ 133