LEASES - Components of lease costs (Details) - USD ($)	3 Months Ended	9 Months Ended
	Jun. 30, 2020	Jun. 30, 2020
Leases
Operating lease cost	$ 1,674,003	$ 5,005,627
Short-term lease cost	79,334	246,776
Variable lease cost	82,092	251,319
Net lease cost	$ 1,835,429	$ 5,503,722