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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Plant and Equipment (Details)
12 Months Ended
Sep. 30, 2021
Maximum | Property and Buildings  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 25 years
Maximum | Machinery and equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 10 years
Maximum | Automobiles  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 5 years
Maximum | Office and electric equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 5 years
Minimum | Property and Buildings  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 20 years
Minimum | Machinery and equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 5 years
Minimum | Automobiles  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 3 years
Minimum | Office and electric equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful lives (in years) 3 years