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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES - Reconciliation of the beginning and ending balance of the assets and liabilities measured at fair value on recurring basis (Details) - USD ($)
12 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Fair Value Disclosures [Abstract]    
Beginning balance $ 0 $ 0
Fair value of short term investment at inception 20,000,000  
Change in fair value 323,400 0
Ending balance $ 20,323,400 $ 0