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Income Taxes (Details) - HKD ($)
$ in Millions
12 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2020
Income Tax and Tax Rate [Line Items]      
Income tax rate 25.00% 25.00% 25.00%
HK      
Income Tax and Tax Rate [Line Items]      
Income tax rate 16.50%    
Preferential income tax rate 8.25%    
Assessable profits threshold for preferential income tax rate $ 2.0    
PRC      
Income Tax and Tax Rate [Line Items]      
Income tax rate 25.00% 25.00% 25.00%
Preferential income tax rate 15.00%