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GOODWILL AND INTANGIBLE ASSETS - Definite Lived Intangibles (Details) - USD ($)
$ in Thousands
 3 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Intangible assets with definite lives    
Cost $ 69,700 $ 77,400
Accumulated Amortization (36,559) (36,922)
Net $ 33,141 40,478
Impairment Of Intangible Asset Finite Lived Statement Of Income Or Comprehensive Income Extensible Enumeration Not Disclosed Flag impairment charge  
Customer lists    
Intangible assets with definite lives    
Cost $ 69,700 76,100
Accumulated Amortization (36,559) (35,644)
Net 33,141 $ 40,456
Impairment charge $ 1,400  
Customer lists | Weighted Average Amortization Life    
Intangible assets with definite lives    
Weighted Average Amortization Life 13 years 7 months 6 days 13 years 3 months 18 days
Trademarks and tradenames    
Intangible assets with definite lives    
Cost   $ 1,300
Accumulated Amortization   (1,278)
Net   $ 22
Trademarks and tradenames | Weighted Average Amortization Life    
Intangible assets with definite lives    
Weighted Average Amortization Life   5 years
Impaired Customer List    
Intangible assets with definite lives    
Cost $ 6,400