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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property, Equipment and Leasehold Improvements, Net (Details)
12 Months Ended
Sep. 30, 2021
Building  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 30 years
Furniture and Equipment  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Computer Hardware and Software | Maximum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 3 years
Computer Hardware and Software | Minimum  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 1 year
Machinery and Equipment  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years
Vehicles  
Property, Plant and Equipment [Line Items]  
Property, Plant and Equipment, Useful Life 5 years