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GOODWILL AND INTANGIBLE ASSETS - Schedule of Intangible Asses (Details) - USD ($)
 6 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Finite-lived Intangible Assets [Roll Forward]        
Beginning Balance $ 41,692,000 $ 52,810,000    
Acquisitions during the period 5,000 33,000    
Amortization during the period (4,770,000) (6,077,000)    
Finite-Lived Intangible Assets, Period Increase (Decrease) (24,000)      
Ending Balance 36,903,000 46,766,000    
Gross carrying amount     $ 109,316,000 $ 109,928,000
Accumulated amortization     (61,947,000) (52,255,000)
Accumulated impairment     (10,466,000) (10,907,000)
Total anticipated intangible amortization 36,903,000 46,766,000 36,903,000 46,766,000
Asset impairment charges 0 0    
Trademarks [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Beginning Balance 10,901,000 11,959,000    
Acquisitions during the period 0 0    
Amortization during the period (544,000) (528,000)    
Finite-Lived Intangible Assets, Period Increase (Decrease) 0      
Ending Balance 10,357,000 11,431,000    
Gross carrying amount     14,624,000 14,624,000
Accumulated amortization     (4,267,000) (3,193,000)
Accumulated impairment     0 0
Total anticipated intangible amortization $ 10,357,000 $ 11,431,000 10,357,000 11,431,000
Trademarks [Member] | Maximum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 15 years 15 years    
Trademarks [Member] | Minimum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 5 years 5 years    
Noncompete Agreements [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Beginning Balance $ 422,000 $ 827,000    
Acquisitions during the period 0 0    
Amortization during the period (191,000) (212,000)    
Finite-Lived Intangible Assets, Period Increase (Decrease) 0      
Ending Balance 231,000 615,000    
Gross carrying amount     2,481,000 2,480,000
Accumulated amortization     (2,250,000) (1,865,000)
Accumulated impairment     0 0
Total anticipated intangible amortization $ 231,000 $ 615,000 231,000 615,000
Noncompete Agreements [Member] | Maximum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 5 years 5 years    
Noncompete Agreements [Member] | Minimum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 3 years 3 years    
Customer Relationships [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Beginning Balance $ 24,333,000 $ 33,207,000    
Acquisitions during the period 0 0    
Amortization during the period (3,716,000) (4,997,000)    
Finite-Lived Intangible Assets, Period Increase (Decrease) 0      
Ending Balance 20,617,000 28,210,000    
Gross carrying amount     82,088,000 82,088,000
Accumulated amortization     (51,223,000) (43,630,000)
Accumulated impairment     (10,248,000) (10,248,000)
Total anticipated intangible amortization $ 20,617,000 $ 28,210,000 20,617,000 28,210,000
Customer Relationships [Member] | Maximum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 30 years 30 years    
Customer Relationships [Member] | Minimum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 10 years 10 years    
Other Intangible Assets [Member]        
Finite-lived Intangible Assets [Roll Forward]        
Beginning Balance $ 6,036,000 $ 6,817,000    
Acquisitions during the period 5,000 33,000    
Amortization during the period (319,000) (340,000)    
Finite-Lived Intangible Assets, Period Increase (Decrease) (24,000)      
Ending Balance 5,698,000 6,510,000    
Gross carrying amount     10,123,000 10,736,000
Accumulated amortization     (4,207,000) (3,567,000)
Accumulated impairment     (218,000) (659,000)
Total anticipated intangible amortization $ 5,698,000 $ 6,510,000 $ 5,698,000 $ 6,510,000
Other Intangible Assets [Member] | Maximum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 20 years 20 years    
Other Intangible Assets [Member] | Minimum        
Finite-lived Intangible Assets [Roll Forward]        
Useful life (in years) 3 years 3 years