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RELATED PARTY TRANSACTIONS (Details) - USD ($)
3 Months Ended 12 Months Ended
Jul. 26, 2016
Sep. 30, 2019
Sep. 30, 2018
Jun. 30, 2019
Related Party Transaction [Line Items]        
Equity in net income of unconsolidated affiliates   $ 3,607,000 $ 2,690,000  
FFF        
Related Party Transaction [Line Items]        
Equity in net income of unconsolidated affiliates   3,605,000 2,621,000  
AEIX | Administrative Fee Revenue        
Related Party Transaction [Line Items]        
Due from related parties       $ 700,000
AEIX | Cost Reimbursement        
Related Party Transaction [Line Items]        
Revenues from related party transactions   1,300,000 1,200,000  
Maximum annual incentive management fee   500,000    
Due from related parties   $ 700,000    
Premier Supply Chain Improvement, Inc | FFF        
Related Party Transaction [Line Items]        
Ownership share of net income of FFF (as a percent) 49.00% 49.00%   49.00%
Premier Supply Chain Improvement, Inc | Administrative Fee Revenue | FFF        
Related Party Transaction [Line Items]        
Equity in net income of unconsolidated affiliates   $ 3,600,000 2,600,000  
Revenues from related party transactions   $ 2,200,000 $ 2,300,000