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Commitments and contingencies - Guarantees (Details)
1 Months Ended 4 Months Ended 12 Months Ended
Jul. 12, 2018
payment
Jul. 04, 2018
CNY (¥)
Apr. 27, 2018
CNY (¥)
May 16, 2016
CNY (¥)
Oct. 31, 2018
CNY (¥)
Jul. 31, 2018
CNY (¥)
Oct. 31, 2018
payment
Jun. 30, 2019
CNY (¥)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
CNY (¥)
Jun. 30, 2018
USD ($)
Loss Contingencies [Line Items]                      
Hunan Huade Food Co. Ltd. (borrower)                   ¥ 5,000,000 $ 728,141
Yuanyang Minyu Micro-Loan Co. Ltd                      
Loss Contingencies [Line Items]                      
Line of Credit Facility, Maximum Borrowing Capacity       ¥ 5,000,000              
Debt Instrument, Monthly Interest Rate       1.80%              
Debt Instrument, Monthly Interest Rate, Additional Default Amount       0.90%              
Yuanyang Minyu Micro-Loan Co. Ltd | Guarantee Obligations                      
Loss Contingencies [Line Items]                      
Long-term Debt     ¥ 1,096,181.02                
Debt Instrument, Monthly Interest Rate, For First 10 Days     2.00%                
Debt Instrument, Monthly Interest Rate, For After 10 Days     4.00%                
Litigation Settlement, Amount Awarded from Other Party     ¥ 25,930                
First Payment To Be Paid By Guarantors under Litigation   ¥ 500,000                  
Second Payment To Be Paid By Guarantors under Litigation   ¥ 500,000                  
Number of Payments Responsible By Guarantors | payment 3                    
Number of Payments Made By Guarantors | payment             2        
First Payment Paid By Guarantors under Litigation           ¥ 500,000          
Second Payment Paid By Guarantors under Litigation         ¥ 500,000            
Guarantors | Yuanyang Minyu Micro-Loan Co. Ltd                      
Loss Contingencies [Line Items]                      
Hunan Huade Food Co. Ltd. (borrower)       ¥ 2,000,000              
Chongqin Penglin Food Co., Ltd                      
Loss Contingencies [Line Items]                      
CQ Mingwen (borrower)               ¥ 9,000,000 $ 1,310,654