GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Mar. 31, 2025	Sep. 30, 2024
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 97,951	$ 100,505
Accumulated Amortization	52,807	46,368
Total	$ 45,144	$ 54,137
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	7 years	7 years
Cost	$ 86,129	$ 88,435
Accumulated Amortization	45,375	40,104
Total	$ 40,754	$ 48,331
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	5 years	5 years
Cost	$ 4,894	$ 5,000
Accumulated Amortization	2,955	2,483
Total	$ 1,939	$ 2,517
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	5 years	5 years
Cost	$ 6,341	$ 6,470
Accumulated Amortization	3,890	3,278
Total	$ 2,451	$ 3,192
Covenants not to compete
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	3 years	3 years
Cost	$ 587	$ 600
Accumulated Amortization	587	503
Total	$ 0	$ 97