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Taxes (Details) - USD ($)
 3 Months Ended 12 Months Ended
Oct. 31, 2022
Jul. 31, 2021
Taxes (Details) [Line Items]    
Income tax rate 25.00%  
Deferred Federal, State and Local, Tax Expense (Benefit) (in Dollars) $ 8.84  
Percentage of valuation allowance provided 100.00%  
Tax benefit, description The second step is to measure the tax benefit as the largest amount that is more than 50% likely of being realized upon settlement. Interest and penalties related to uncertain tax positions are recognized and recorded as necessary in the provision for income taxes. The Company is subject to income taxes in the PRC. According to the PRC Tax Administration and Collection Law, the statute of limitations is three years if the underpayment of taxes is due to computational errors made by the taxpayer or the withholding agent.  
Limitation of tax, description The statute of limitations is extended to five years under special circumstances, where the underpayment of taxes is more than RMB 100,000. In the case of transfer pricing issues, the statute of limitation is ten years. There is no statute of limitation in the case of tax evasion. There were no uncertain tax positions as of October 31, 2022 and July 31, 2022 and the Company does not believe that its unrecognized tax benefits will change over the next twelve months.  
Hong Kong [Member]    
Taxes (Details) [Line Items]    
Statutory income tax rate   16.50%
China [Member]    
Taxes (Details) [Line Items]    
Income tax rate 10.00%  
USA [Member]    
Taxes (Details) [Line Items]    
Statutory income tax rate 21.00%