Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

INCOME TAXES - Additional Information (Details)

v3.21.4
INCOME TAXES - Additional Information (Details)
12 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2021
CNY (¥)
Sep. 30, 2016
USD ($)
Deferred tax assets $ 353,460 $ 724,612 $ 289,756   ¥ 353,460  
Income tax rate 15.00% 15.00% 15.00%      
Statute of limitations period (in years) 3 years          
Unrecognized tax benefits $ 2,354,832 $ 3,188,615 $ 4,176,537 $ 2,354,832   $ 4,098,783
State Administration of Taxation, China            
Income tax rate 25.00%          
State Administration of Taxation, China | Zhengkang            
Income tax rate 15.00%          
Preferential tax rate, validity period 3 years          
State Administration of Taxation, China | Zhengfeng and Weijia            
Income tax rate 25.00%          
Inland Revenue, Hong Kong | ZK Pipe Industry Co            
Income tax rate 16.50%          
Uganda Revenue Authority | ZK Uganda            
Income tax rate 30.00%