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GOODWILL AND INTANGIBLE ASSETS - Intangible Assets (Details) - USD ($)
$ in Thousands
Mar. 31, 2026
Sep. 30, 2025
Finite-lived intangible assets:    
Cost $ 208,826  
Accumulated Amortization (52,037)  
Carrying Value 156,789  
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Cost 208,842  
Accumulated Amortization (52,037)  
Carrying Value 156,805 $ 135,797
Trademarks    
Indefinite-Lived Intangible Assets [Line Items]    
Indefinite-lived intangible assets: 16  
Customer relationships    
Finite-lived intangible assets:    
Cost 206,550  
Accumulated Amortization (50,342)  
Carrying Value 156,208  
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization $ (50,342)  
Customer relationships | Minimum    
Finite-lived intangible assets:    
Amortization life 9 years  
Customer relationships | Maximum    
Finite-lived intangible assets:    
Amortization life 20 years  
Trade names    
Finite-lived intangible assets:    
Cost $ 2,101  
Accumulated Amortization (1,597)  
Carrying Value 504  
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization $ (1,597)  
Trade names | Minimum    
Finite-lived intangible assets:    
Amortization life 1 year  
Trade names | Maximum    
Finite-lived intangible assets:    
Amortization life 5 years  
Non-compete agreements and other intangible assets    
Finite-lived intangible assets:    
Cost $ 175  
Accumulated Amortization (98)  
Carrying Value 77  
Intangible Assets, Net (Excluding Goodwill) [Abstract]    
Accumulated Amortization $ (98)  
Non-compete agreements and other intangible assets | Minimum    
Finite-lived intangible assets:    
Amortization life 1 year  
Non-compete agreements and other intangible assets | Maximum    
Finite-lived intangible assets:    
Amortization life 8 years