GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2025	Sep. 30, 2024
Amortizable intangible assets:
Gross Carrying Value	$ 426,976	$ 644,285
Accumulated Amortization	(358,998)	(396,667)
Net Carrying Value	67,978	247,618
Intangible Assets, Net (Excluding Goodwill) [Abstract]
Gross Carrying Value	519,756	737,098
Net Carrying Value	160,758	340,431
Trade names
Indefinite-lived Intangible Assets [Line Items]
Trade names	92,780	92,813
Customer relationships
Amortizable intangible assets:
Gross Carrying Value	401,771	600,317
Accumulated Amortization	(338,201)	(371,600)
Net Carrying Value	$ 63,570	228,717
Customer relationships | Weighted Average
Amortizable intangible assets:
Weighted Average Useful Life (Years)	10 years
Other
Amortizable intangible assets:
Gross Carrying Value	$ 25,205	43,968
Accumulated Amortization	(20,797)	(25,067)
Net Carrying Value	$ 4,408	$ 18,901
Other | Weighted Average
Amortizable intangible assets:
Weighted Average Useful Life (Years)	8 years