GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Jun. 30, 2025	Sep. 30, 2024
Indefinite Lived Intangible Assets By Major Class [Line Items]
Cost	$ 103,197	$ 100,505
Accumulated Amortization	59,389	46,368
Total	$ 43,808	$ 54,137
Completed technologies
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	7 years	7 years
Cost	$ 90,695	$ 88,435
Accumulated Amortization	50,939	40,104
Total	$ 39,756	$ 48,331
Customer relationships
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	5 years	5 years
Cost	$ 5,185	$ 5,000
Accumulated Amortization	3,390	2,483
Total	$ 1,795	$ 2,517
Trade names
Indefinite Lived Intangible Assets By Major Class [Line Items]
Weighted Average Amortization Period (in years)	5 years	5 years
Cost	$ 6,695	$ 6,470
Accumulated Amortization	4,438	3,278
Total	$ 2,257	$ 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	$ 622	$ 600
Accumulated Amortization	622	503
Total	$ 0	$ 97