Value of input used to measure net derivative asset (liability).

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Indicates valuation technique for measuring net derivative asset (liability).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 820
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (bbb)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482106/820-10-50-2

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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

No definition available.

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- Definition

The dollar value of a reasonably possible increase in an unobservable input used in fair value measurement of assets or liabilities.

+ References

No definition available.

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FAIR VALUE HIERARCHY - Significant unobservable inputs used in the fair value measurements categorized within Level 3 (Details) - Level 3 $ in Thousands	Dec. 31, 2023 USD ($)	Dec. 31, 2022
CCIRS contract of the loan No.1
FAIR VALUE HIERARCHY
Derivative Asset (Liability) Net, Valuation Technique [Extensible Enumeration]		us-gaap:ValuationTechniqueDiscountedCashFlowMember
CCIRS contract of the loan No.1 \| Minimum \| Interpolated LIBOR for subsequent years
FAIR VALUE HIERARCHY
Derivative, measurement input	0.0470	0.0441
CCIRS contract of the loan No.1 \| Maximum \| Interpolated LIBOR for subsequent years
FAIR VALUE HIERARCHY
Derivative, measurement input	0.0554	0.0496
CCIRS contract of the loan No.2
FAIR VALUE HIERARCHY
Derivative Asset (Liability) Net, Valuation Technique [Extensible Enumeration]		us-gaap:ValuationTechniqueDiscountedCashFlowMember
CCIRS contract of the loan No.2 \| Minimum \| Interpolated LIBOR for subsequent years
FAIR VALUE HIERARCHY
Derivative, measurement input	0.0498	0.0454
CCIRS contract of the loan No.2 \| Maximum \| Interpolated LIBOR for subsequent years
FAIR VALUE HIERARCHY
Derivative, measurement input	0.0557	0.0497
CCIRS contract of the loan No.3
FAIR VALUE HIERARCHY
Derivative Asset (Liability) Net, Valuation Technique [Extensible Enumeration]		us-gaap:ValuationTechniqueDiscountedCashFlowMember
CCIRS contract of the loan No.3 \| Minimum \| Interpolated LIBOR for subsequent years
FAIR VALUE HIERARCHY
Derivative, measurement input		0.0486
CCIRS contract of the loan No.3 \| Maximum \| Interpolated LIBOR for subsequent years
FAIR VALUE HIERARCHY
Derivative, measurement input		0.0489
DPS2
FAIR VALUE HIERARCHY
Derivative Asset (Liability) Net, Valuation Technique [Extensible Enumeration]	vfs:ValuationTechniqueLatticeModelAndDiscountedCashFlowMember	vfs:ValuationTechniqueLatticeModelAndDiscountedCashFlowMember
DPS2 \| Credit spread of the Company
FAIR VALUE HIERARCHY
Derivative, measurement input	0.1246	0.1246
DPS2 \| Fair value of the ordinary shares
FAIR VALUE HIERARCHY
Derivative, measurement input	0.0331
Dollar value of increase in measurement input	$ 8,370
DPS2 \| Dividend yield
FAIR VALUE HIERARCHY
Derivative, measurement input	0
DPS2 \| Volatility
FAIR VALUE HIERARCHY
Derivative, measurement input	0.666
DPS2 \| Minimum \| Volatility
FAIR VALUE HIERARCHY
Derivative, measurement input		0.85
DPS2 \| Maximum \| Volatility
FAIR VALUE HIERARCHY
Derivative, measurement input		0.88