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BASIS OF PRESENTATION AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Property and Equipment (Details)
12 Months Ended
Sep. 30, 2019
Buildings and land improvements  
Property, Plant and Equipment [Line Items]  
Estimated useful life 40 years
Minimum | Furniture and equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful life 3 years
Maximum | Furniture and equipment  
Property, Plant and Equipment [Line Items]  
Estimated useful life 7 years