3.22.0.1 html 145 209 1 true 92 0 false 2 false false R1.htm 01001 - Document - Document and Entity Information {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/DocumentAndEntityInformation1 Document and Entity Information 1 false true R2.htm 01002 - Document - Risk/Return Summary (MainStay Candriam Emerging Markets Debt Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary2 Risk/Return Summary (MainStay Candriam Emerging Markets Debt Fund) 2 false false R3.htm 01003 - Disclosure - Risk/Return Detail Data (MainStay Candriam Emerging Markets Debt Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData3 Risk/Return Detail Data (MainStay Candriam Emerging Markets Debt Fund) 3 false true R10.htm 01010 - Document - Risk/Return Summary (MainStay MacKay High Yield Corporate Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary10 Risk/Return Summary (MainStay MacKay High Yield Corporate Bond Fund) 4 false false R11.htm 01011 - Disclosure - Risk/Return Detail Data (MainStay MacKay High Yield Corporate Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData11 Risk/Return Detail Data (MainStay MacKay High Yield Corporate Bond Fund) 5 false true R18.htm 01018 - Document - Risk/Return Summary (MainStay MacKay Strategic Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary18 Risk/Return Summary (MainStay MacKay Strategic Bond Fund) 6 false false R19.htm 01019 - Disclosure - Risk/Return Detail Data (MainStay MacKay Strategic Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData19 Risk/Return Detail Data (MainStay MacKay Strategic Bond Fund) 7 false true R26.htm 01026 - Document - Risk/Return Summary (MainStay MacKay U.S. Infrastructure Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary26 Risk/Return Summary (MainStay MacKay U.S. Infrastructure Bond Fund) 8 false false R27.htm 01027 - Disclosure - Risk/Return Detail Data (MainStay MacKay U.S. Infrastructure Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData27 Risk/Return Detail Data (MainStay MacKay U.S. Infrastructure Bond Fund) 9 false true R34.htm 01034 - Document - Risk/Return Summary (MainStay MacKay Tax Free Bond Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary34 Risk/Return Summary (MainStay MacKay Tax Free Bond Fund) 10 false false R35.htm 01035 - Disclosure - Risk/Return Detail Data (MainStay MacKay Tax Free Bond Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData35 Risk/Return Detail Data (MainStay MacKay Tax Free Bond Fund) 11 false true R42.htm 01042 - Document - Risk/Return Summary (MainStay Money Market Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary42 Risk/Return Summary (MainStay Money Market Fund) 12 false false R43.htm 01043 - Disclosure - Risk/Return Detail Data (MainStay Money Market Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData43 Risk/Return Detail Data (MainStay Money Market Fund) 13 false true R50.htm 01050 - Document - Risk/Return Summary (MainStay Income Builder Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary50 Risk/Return Summary (MainStay Income Builder Fund) 14 false false R51.htm 01051 - Disclosure - Risk/Return Detail Data (MainStay Income Builder Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData51 Risk/Return Detail Data (MainStay Income Builder Fund) 15 false true R58.htm 01058 - Document - Risk/Return Summary (MainStay MacKay Convertible Fund) {Unlabeled} Sheet http://www.mainstayinvestments.com/20211031/role/RRSummary58 Risk/Return Summary (MainStay MacKay Convertible Fund) 16 false false R59.htm 01059 - Disclosure - Risk/Return Detail Data (MainStay MacKay Convertible Fund) {Elements} Sheet http://www.mainstayinvestments.com/20211031/role/RRDetailData59 Risk/Return Detail Data (MainStay MacKay Convertible Fund) 17 false false All Reports Book All Reports c497.htm c497-20220228.xsd c497-20220228_cal.xml c497-20220228_def.xml c497-20220228_lab.xml c497-20220228_pre.xml img_0657188ad6c04f1.jpg img_0f13b489340a4f1.jpg img_260690ec9f074f1.jpg img_3024b3162bb64f1.jpg img_440421bed2ee4f1.jpg img_65a9705598204f1.jpg img_6f1908cddedd4f1.jpg img_73b3c936ac294f1.jpg img_8364ed7b4c104f1.jpg img_85da012be1474f1.jpg img_86b0a490705a4f1.jpg img_9f92d6486e6c4f1.jpg img_b7b94858cca14f1.jpg img_c057f58f40684f1.jpg img_dead837595274f1.jpg img_f5882730e8ed4f1.jpg img_f8ae3ed855534f1.jpg BarChart1.png BarChart2.png BarChart3.png BarChart4.png BarChart5.png BarChart6.png BarChart7.png BarChart8.png http://xbrl.sec.gov/dei/2020-01-31 http://xbrl.sec.gov/rr/2018-01-31 true true