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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

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