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Intangible Asset (Tables)
12 Months Ended
Sep. 30, 2023
Intangible Asset [Abstract]  
Schedule of Intangible Asset
   (Predecessor)   (Successor) 
   As of September 30, 
   2022   2023 
   HK$   HK$   US$ 
Software   
    5,116,814    653,422 
Less: amortization   
    (511,681)   (65,342)
Software, net   
       —
    4,605,133    588,080 
Schedule of Estimated Aggregate Amortization Expenses The estimated aggregate amortization expenses for each of the five succeeding fiscal years and thereafter are as follows:
   HK$ 
Years ending September 30,    
2024   511,681 
2025   511,681 
2026   511,681 
2027   511,681 
2028   511,681 
Thereafter   2,046,728 
    4,605,133