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PROCESSING AND SERVICING COSTS (Details) - HKD ($) $ in Thousands | 6 Months Ended | 9 Months Ended
--- | --- | ---
Jun. 30, 2022 | Jun. 30, 2021 | Sep. 30, 2022 | Sep. 30, 2021
PROCESSING AND SERVICING COSTS |  |  |  |
Cloud service fee | $ 116,695 | $ 46,029 | $ 168,555 | $ 75,575
Market information and data fee | 38,264 | 31,753 | 56,229 | 50,257
Data transmission fee | 16,969 | 31,083 | 28,393 | 42,638
System cost | 11,793 | 3,983 | 19,715 | 9,709
SMS service fee | 544 | 549 | 823 | 905
Others | 2,534 | 2,627 | 3,927 | 4,379
Total | $ 186,799 | $ 116,024 | $ 277,642 | $ 183,463

X
- Definition The amount of expense in the period for cloud service fee. + References No definition available. + Details
Name: | futu_CloudServiceFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense in the period for data transmission fee. + References No definition available. + Details
Name: | futu_DataTransmissionFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense in the period for market information and data fee. + References No definition available. + Details
Name: | futu_MarketInformationAndDataFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The cost related to other processing and servicing. + References No definition available. + Details
Name: | futu_OtherProcessingAndServicingCosts
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense during the period paid for market information, cloud service, data transmission and etc. + References No definition available. + Details
Name: | futu_ProcessingAndServicingCosts
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition n/a. + References No definition available. + Details
Name: | futu_ProcessingAndServicingCostsLineItems
Namespace Prefix: | futu_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The amount of expense in the period for SMS service fee. + References No definition available. + Details
Name: | futu_SmsServiceFee
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition The amount of expense in the period for system costs. + References No definition available. + Details
Name: | futu_SystemCost
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration