Label	Element	Value
Risk/Return:	oef_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Oct. 31, 2025
Registrant Name	dei_EntityRegistrantName	NEW YORK LIFE INVESTMENTS FUNDS
Entity Central Index Key	dei_EntityCentralIndexKey	0000787441
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Feb. 26, 2026
Document Effective Date	dei_DocumentEffectiveDate	Feb. 28, 2026
Entity Investment Company Type	dei_EntityInvCompanyType	N-1A
Prospectus Date	oef_ProspectusDate	Feb. 28, 2026
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLAAX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLINX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLACX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLAIX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class R1
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLRRX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class R2
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLRTX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class R3
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLGRX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLRSX
Prospectus Summary \| NYLI Winslow Large Cap Growth Fund \| SIMPLE CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MLRMX
Prospectus Summary \| NYLI WMC Enduring Capital Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSOAX
Prospectus Summary \| NYLI WMC Enduring Capital Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCSSX
Prospectus Summary \| NYLI WMC Enduring Capital Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGOCX
Prospectus Summary \| NYLI WMC Enduring Capital Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSOIX
Prospectus Summary \| NYLI WMC Enduring Capital Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCSDX
Prospectus Summary \| NYLI WMC Value Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MAPAX
Prospectus Summary \| NYLI WMC Value Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSMIX
Prospectus Summary \| NYLI WMC Value Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMPCX
Prospectus Summary \| NYLI WMC Value Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MUBFX
Prospectus Summary \| NYLI WMC Value Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMPDX
Prospectus Summary \| NYLI Candriam Emerging Markets Debt Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGHAX
Prospectus Summary \| NYLI Candriam Emerging Markets Debt Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGHHX
Prospectus Summary \| NYLI Candriam Emerging Markets Debt Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHYCX
Prospectus Summary \| NYLI Candriam Emerging Markets Debt Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGHIX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHCAX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHHIX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MYHCX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHYIX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| Class R2
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHYRX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| Class R3
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHYTX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHYSX
Prospectus Summary \| NYLI MacKay High Yield Corporate Bond Fund \| SIMPLE CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MHHSX
Prospectus Summary \| NYLI MacKay Strategic Bond Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MASAX
Prospectus Summary \| NYLI MacKay Strategic Bond Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSYDX
Prospectus Summary \| NYLI MacKay Strategic Bond Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSICX
Prospectus Summary \| NYLI MacKay Strategic Bond Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSDIX
Prospectus Summary \| NYLI MacKay Strategic Bond Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSYEX
Prospectus Summary \| NYLI MacKay U.S. Infrastructure Bond Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGVAX
Prospectus Summary \| NYLI MacKay U.S. Infrastructure Bond Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGVNX
Prospectus Summary \| NYLI MacKay U.S. Infrastructure Bond Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGVCX
Prospectus Summary \| NYLI MacKay U.S. Infrastructure Bond Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGOIX
Prospectus Summary \| NYLI MacKay U.S. Infrastructure Bond Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MGVDX
Prospectus Summary \| NYLI MacKay Tax Free Bond Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTBAX
Prospectus Summary \| NYLI MacKay Tax Free Bond Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MKINX
Prospectus Summary \| NYLI MacKay Tax Free Bond Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTFCX
Prospectus Summary \| NYLI MacKay Tax Free Bond Fund \| Class C2
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTSPX
Prospectus Summary \| NYLI MacKay Tax Free Bond Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTBIX
Prospectus Summary \| NYLI MacKay Tax Free Bond Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTBDX
Prospectus Summary \| NYLI Money Market Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MMAXX
Prospectus Summary \| NYLI Money Market Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MKTXX
Prospectus Summary \| NYLI Money Market Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MSCXX
Prospectus Summary \| NYLI Money Market Fund \| SIMPLE CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MIPXX
Prospectus Summary \| NYLI Income Builder Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTRAX
Prospectus Summary \| NYLI Income Builder Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTINX
Prospectus Summary \| NYLI Income Builder Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCTRX
Prospectus Summary \| NYLI Income Builder Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTOIX
Prospectus Summary \| NYLI Income Builder Fund \| Class R6
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTODX
Prospectus Summary \| NYLI Income Builder Fund \| SIMPLE CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MTISX
Prospectus Summary \| NYLI MacKay Convertible Fund \| Class A
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCOAX
Prospectus Summary \| NYLI MacKay Convertible Fund \| INVESTOR CLASS
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCINX
Prospectus Summary \| NYLI MacKay Convertible Fund \| Class C
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCCVX
Prospectus Summary \| NYLI MacKay Convertible Fund \| Class I
Risk/Return:	oef_RiskReturnAbstract
Trading Symbol	dei_TradingSymbol	MCNVX

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- Definition

The date the document was made available and submitted, in YYYY-MM-DD format. The date of submission, date of acceptance by the recipient, and the document effective date are all potentially different.

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No definition available.

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- Definition

The type of document being provided (such as 10-K, 10-Q, 485BPOS, etc). The document type is limited to the same value as the supporting SEC submission type, or the word 'Other'.

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A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-Name Exchange Act
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-Section 313

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Exchange Act
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-Section 12
-Subsection b-2

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Trading symbol of an instrument as listed on an exchange.

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