GOODWILL AND INTANGIBLE ASSETS - Intangible Assets, net by major class (Details) - USD ($) $ in Thousands	Jun. 30, 2023	Sep. 30, 2022
Finite-Lived intangible assets
Carrying Amount, Gross	$ 378,471	$ 380,699
Accumulated Amortization	(60,918)	(34,813)
Carrying Amount, Net	317,553	345,886
Customer relationships
Finite-Lived intangible assets
Carrying Amount, Gross	317,272	318,896
Accumulated Amortization	(47,771)	(26,990)
Carrying Amount, Net	269,501	291,906
Intellectual property
Finite-Lived intangible assets
Carrying Amount, Gross	56,393	56,997
Accumulated Amortization	(10,667)	(5,767)
Carrying Amount, Net	45,726	51,230
Non-compete agreements
Finite-Lived intangible assets
Carrying Amount, Gross	2,410	2,410
Accumulated Amortization	(1,214)	(872)
Carrying Amount, Net	1,196	1,538
Other
Finite-Lived intangible assets
Carrying Amount, Gross	2,396	2,396
Accumulated Amortization	(1,266)	(1,184)
Carrying Amount, Net	$ 1,130	$ 1,212