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SIGNIFICANT ACCOUNTING POLICIES - Exclusive Option Agreement (Details) | 12 Months Ended
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Dec. 31, 2025 CNY (¥) ¥ / shares
SIGNIFICANT ACCOUNTING POLICIES |
Purchase price for equity interests in Shenzhen Futu under exclusive option agreement | ¥ / shares | ¥ 1
Threshold of shenzhen futu disposes of Shenzhen Futu's material assets without prior written consent of shen si | ¥ | ¥ 500,000

X
- Definition Amount represents the material contract of value of assets under exclusive option agreement. + References No definition available. + Details
Name: | futu_MaterialContractOfValueOfAssetsUnderExclusiveOptionAgreement
Namespace Prefix: | futu_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount represents the purchase price of exclusive option agreement. + References No definition available. + Details
Name: | futu_PurchasePriceForExclusiveOptionAgreement
Namespace Prefix: | futu_
Data Type: | dtr-types:perShareItemType
Balance Type: | na
Period Type: | duration

X
- References No definition available. + Details
Name: | us-gaap_AccountingPoliciesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration