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Other income - Additional information (Details) - 12 months ended Jun. 30, 2022 - Paycheck Protection Program
USD ($)
CNY (¥)
Other income    
Subsidy amount received $ 1,320,000 ¥ 8,548,000
Subsidiaries    
Other income    
Subsidy amount received $ 1,320,000 ¥ 8,548,000