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Advances to suppliers, net - Additional information (Details)
1 Months Ended 12 Months Ended
Jan. 25, 2022
USD ($)
Apr. 01, 2016
item
Jun. 30, 2021
Apr. 30, 2019
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Oct. 01, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2018
USD ($)
Share-based Goods and Nonemployee Services Transaction [Line Items]                  
Advances to suppliers         $ 66,718,632 $ 23,350,467 $ 24,074,122 $ 13,994,091  
Frame work Agreement     3 years 3 years          
Allowance for doubtful accounts         8,094 119,199   $ 0 $ 0
Allowance for doubtful debts relating to advances to suppliers         $ 0 $ 723,655      
Two suppliers                  
Share-based Goods and Nonemployee Services Transaction [Line Items]                  
Advances to suppliers $ 35,400,000                
Percentage of advances to suppliers utilized 53.10%                
Percentage of advances to suppliers on each purchase order 30.00%                
Number of suppliers | item   2