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Summary of Significant Accounting Policies - Insurance brokerage service (Details) - HKD ($)
$ in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Revenue subject to clawback provision $ 0.3 $ 0.2 $ 1.0
Minimum      
Commission payment term 6 days    
Maximum      
Commission payment term 26 days