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ASSETS FROM THE INVESTOR ASSURANCE PROGRAM - Additional Information (Detail) - CNY (¥) ¥ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assets From Investor Assurance Program [Abstract]
Additional provisions as provision for assets and liabilities	¥ 0	¥ 8,277
Allowance for uncollectible assets		¥ 8,277

X

- Definition

Additional Provision For Assets And Liabilities From Investor Assurance Program.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Allowance for uncollectible assets from investor program.

+ References

No definition available.

+ Details

Name:	jfin_AllowanceForUncollectibleAssetsFromInvestorAssuranceProgram
Namespace Prefix:	jfin_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Assets From Investor Assurance Program [Abstract]

+ References

No definition available.

+ Details

Name:	jfin_AssetsFromInvestorAssuranceProgramAbstract
Namespace Prefix:	jfin_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration