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Shareholders equity (Details Narrative) - USD ($)
 1 Months Ended 12 Months Ended
Oct. 13, 2022
Jan. 18, 2024
Jan. 31, 2023
Sep. 27, 2022
Sep. 30, 2024
Sep. 30, 2023
Mar. 13, 2023
Jan. 30, 2023
Dec. 30, 2022
Nov. 11, 2022
Description of share consolidation   On January 18, 2024, the Company consolidated its issued and outstanding ordinary shares from 70,449,781 Class A ordinary shares of no par value and 3,020,969 Class B ordinary shares of no par value to 2,348,326 Class A ordinary shares of no par value and 100,698 Class B ordinary shares of no par value, on a 30:1 basis. As a result of reverse share split, 250 Class A ordinary shares were acquired from the market and were cancelled accordingly                
Unsecured convertible note principal amount                 $ 3,230,000  
Interest rate                 7.00%  
Statutory reserves         $ 14,990,000,000 $ 500,000        
Restricted stock issued             66,667      
CN Energy [Member]                    
Underwriting agreement, Description     public offering (the “Offering”) (i) 10,396,974 units, each consisting of one Class A ordinary share, no par value (collectively, the “Class A ordinary shares”) and one warrant, each exercisable to purchase one Class A ordinary share at an exercise price of $0.55 (or $1.4529 after the reverse share split) per share (collectively, the “warrants”), at an offering price of $0.55 per unit; and (ii) 7,786,300 units, each consisting of one pre-funded warrant, each exercisable to purchase one Class A ordinary share at an exercise price of $0.0001 per share (collectively, the “Pre-funded Warrants”), and one warrant, at an offering price of $0.5499 per unit (together with the Class A ordinary shares and the warrants, the “Offered Securities”), to those purchasers whose purchase of Class A ordinary shares in the Offering would otherwise result in the purchaser, together with its affiliates and certain related parties, beneficially owning more than 4.99% (or, at the election of the holder, 9.99%) of CN Energy’s outstanding ordinary shares immediately following the consummation of the Offering. The components of the units were issued separately and are immediately separable upon issuance              
Proceeds from the Offering     $ 7,800,000              
Common Class A [Member]                    
Number of ordinary shares issued         6,812,261 2,285,826        
Number of ordinary shares outstanding         6,812,261 2,285,826        
Number of Warrants outstanding         6,783,337 6,883,337        
Pre-funded Warrants exercised           103,735   4,672,700    
Conversion of ordinary shares           103,735        
Pre-funded Warrants outstanding         1,554 1,554   4,672,700    
Warrants exercise price   $ 1.4529                
Warrants   18,183,274                
Warrants adjuted for reverse share split   6,883,337                
Number of warrants exercised         100,000 0        
Number of warrants exercised, value         $ 145,290 $ 0        
Common Class A [Member] | Private Placement [Member] | CN Energy [Member]                    
Issuance of ordinary shares for private placement, net, shares 350,467                  
Proceeds from private placement $ 18,000,000                  
Common Class A [Member] | Private Placement [Member]                    
Issuance of ordinary shares for private placement, net, shares       10,514,018            
Purchase price of ordinary shares       $ 1.712            
Proceeds from private placement       $ 18,000,000            
Common Class A [Member] | Issuance of Ordinary Shares for Acquisition [Member]                    
Number of ordinary shares issued                   293,984
Number of ordinary shares                   $ 18,373,771
Purchase price                   $ 17,706,575
Percentage of Ownership                   100.00%
Common Class A [Member] | Parent Company [Member]                    
Number of ordinary shares issued         4,426,685 299,896        
Convertible note         $ 2,420,000 $ 1,250,000        
Conversion price           $ 0.12        
Common Class B [Member]                    
Number of ordinary shares issued         100,698 100,698        
Number of ordinary shares outstanding         100,698 100,698