GOODWILL AND INTANGIBLE ASSETS - Intangible Assets Arising from Business Acquisitions (Details) - USD ($) $ in Thousands	6 Months Ended
	Mar. 31, 2022	Sep. 30, 2021
Finite-Lived Intangible Assets [Line Items]
Gross Carrying Amount	$ 100,461	$ 100,461
Accumulated Amortization	30,215	26,623
Net	$ 70,246	73,838
Developed technology
Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	15 years
Gross Carrying Amount	$ 89,096	89,096
Accumulated Amortization	25,160	22,182
Net	$ 63,936	66,914
Intellectual property
Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	13 years
Gross Carrying Amount	$ 1,500	1,500
Accumulated Amortization	272	216
Net	$ 1,228	1,284
Trade name
Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	20 years
Gross Carrying Amount	$ 5,865	5,865
Accumulated Amortization	1,316	1,158
Net	$ 4,549	4,707
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Weighted Average Estimated Useful Lives	5 years
Gross Carrying Amount	$ 4,000	4,000
Accumulated Amortization	3,467	3,067
Net	$ 533	$ 933