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TAXATION - Movement of Valuation Allowance (Details) - HKD ($) $ in Thousands	6 Months Ended		9 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Movement of Valuation Allowance
Balance at beginning of the period	$ 169,422	$ 67,768	$ 169,422	$ 67,768
Additions	58,939	52,234	89,878	92,445
Reversals	(57,639)	(748)	(121,649)	(669)
Balance at end of the period	$ 170,722	$ 119,255	$ 137,651	$ 159,544

X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

+ Details

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Namespace Prefix:	futu_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Amount of valuation allowance, deferred tax asset, additions.

+ References

No definition available.

+ Details

Name:	futu_ValuationAllowanceDeferredTaxAssetAdditionsAmount
Namespace Prefix:	futu_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of valuation allowance, deferred tax asset, reversals.

+ References

No definition available.

+ Details

Name:	futu_ValuationAllowanceDeferredTaxAssetReversalsAmount
Namespace Prefix:	futu_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)
-URI https://asc.fasb.org/extlink&oid=121826272&loc=d3e32537-109319

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	credit
Period Type:	instant