{ "version": "2.2", "instance": { "d821456dncsr.htm": { "nsprefix": "bfiii", "nsuri": "http://www.blackrock.com/20260225", "dts": { "schema": { "local": [ "cik0000893818-20260225.xsd" ], "remote": [ "http://www.xbrl.org/2003/xbrl-instance-2003-12-31.xsd", "http://www.xbrl.org/2003/xbrl-linkbase-2003-12-31.xsd", "http://www.xbrl.org/2003/xl-2003-12-31.xsd", "http://www.xbrl.org/2003/xlink-2003-12-31.xsd", "http://www.xbrl.org/2005/xbrldt-2005.xsd", "http://www.xbrl.org/2006/ref-2006-02-27.xsd", "http://www.xbrl.org/lrr/arcrole/deprecated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/negated-2009-12-16.xsd", "http://www.xbrl.org/lrr/role/reference-2009-12-16.xsd", "https://www.xbrl.org/2020/extensible-enumerations-2.0.xsd", "https://www.xbrl.org/dtr/type/2020-01-21/types.xsd", "https://www.xbrl.org/dtr/type/2024-01-31/types.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-roles-2025.xsd", "https://xbrl.fasb.org/srt/2025/elts/srt-types-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-gaap-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-roles-2025.xsd", "https://xbrl.fasb.org/us-gaap/2025/elts/us-types-2025.xsd", "https://xbrl.sec.gov/country/2025/country-2025.xsd", "https://xbrl.sec.gov/country/2025/country-2025_def.xsd", "https://xbrl.sec.gov/dei/2025/dei-2025.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025.xsd", "https://xbrl.sec.gov/oef/2025/oef-2025_lab.xsd", "https://xbrl.sec.gov/oef/2025/oef-sr-2025.xsd", "https://xbrl.sec.gov/stpr/2025/stpr-2025.xsd" ] }, "inline": { "local": [ "d821456dncsr.htm" ] } }, "keyStandard": 36, "keyCustom": 0, "axisStandard": 6, "axisCustom": 0, "memberStandard": 3, "memberCustom": 75, "hidden": { "total": 604, "http://xbrl.sec.gov/oef/2025": 601, "http://xbrl.sec.gov/dei/2025": 3 }, "contextCount": 1270, "entityCount": 1, "segmentCount": 78, "elementCount": 200, "unitCount": 3, "baseTaxonomies": { "http://xbrl.sec.gov/oef/2025": 2619, "http://fasb.org/us-gaap/2025": 80, "http://xbrl.sec.gov/dei/2025": 46 }, "report": { "R1": { "role": "http://xbrl.sec.gov/oef/role/NcsrCover", "longName": "030000 - Disclosure - Form N-CSR Cover", "shortName": "Form N-CSR Cover", "isDefault": "true", "groupType": "disclosure", "subGroupType": "", "menuCat": "Cover", "order": "1", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:DocumentType", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "first": true }, "uniqueAnchor": null }, "R2": { "role": "http://xbrl.sec.gov/oef/role/ShareholderReport", "longName": "030001 - Disclosure - Shareholder Report", "shortName": "Shareholder Report", "isDefault": "false", "groupType": "disclosure", "subGroupType": "", "menuCat": "Notes", "order": "2", "firstAnchor": { "contextRef": "DefaultContext", "name": "dei:DocumentType", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "first": true }, "uniqueAnchor": { "contextRef": "FY2025_C000101136Member", "name": "oef:FundName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "unique": true } }, "R3": { "role": "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails", "longName": "040010 - Disclosure - Shareholder Report, Line Graph (Details)", "shortName": "Shareholder Report, Line Graph (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "3", "firstAnchor": { "contextRef": "FY2025_C000101136Member", "name": "oef:LineGraphAndTableMeasureName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "td", "tr", "table", "oef:AvgAnnlRtrTableTextBlock", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "first": true }, "uniqueAnchor": null }, "R4": { "role": "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "longName": "040015 - Disclosure - Shareholder Report, Average Annual Return (Details)", "shortName": "Shareholder Report, Average Annual Return (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "4", "firstAnchor": { "contextRef": "FY2025_C000101136Member", "name": "oef:LineGraphAndTableMeasureName", "unitRef": null, "xsiNil": "false", "lang": "en-US", "decimals": null, "ancestors": [ "td", "tr", "table", "oef:AvgAnnlRtrTableTextBlock", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "first": true }, "uniqueAnchor": { "contextRef": "FY2025_C000101136Member", "name": "oef:AvgAnnlRtrPct", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "oef:AvgAnnlRtrTableTextBlock", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "unique": true } }, "R5": { "role": "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "longName": "040020 - Disclosure - Shareholder Report, Holdings (Details)", "shortName": "Shareholder Report, Holdings (Details)", "isDefault": "false", "groupType": "disclosure", "subGroupType": "details", "menuCat": "Details", "order": "5", "firstAnchor": { "contextRef": "TI20251231_C000101136Member_ISharesGlobalInfrastructureETFMember", "name": "oef:PctOfNav", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "oef:LargestHoldingsTableTextBlock", "ix:continuation", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "first": true, "unique": true }, "uniqueAnchor": { "contextRef": "TI20251231_C000101136Member_ISharesGlobalInfrastructureETFMember", "name": "oef:PctOfNav", "unitRef": "pure", "xsiNil": "false", "lang": null, "decimals": "4", "ancestors": [ "td", "tr", "table", "oef:LargestHoldingsTableTextBlock", "ix:continuation", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "div", "body", "html" ], "reportCount": 1, "baseRef": "d821456dncsr.htm", "first": true, "unique": true } } }, "tag": { "oef_AccmVal": { "xbrltype": "monetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccmVal", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Accumulated Value" } } }, "auth_ref": [ "r35" ] }, "oef_AccountValueLineItems": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccountValueLineItems", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Account Value [Line Items]" } } }, "auth_ref": [ "r34" ] }, "oef_AccountValueTable": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccountValueTable", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Account Value [Table]" } } }, "auth_ref": [ "r34" ] }, "oef_AccountValueTableAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccountValueTableAbstract", "lang": { "en-us": { "role": { "label": "Account Value Table [Abstract]" } } }, "auth_ref": [ "r34" ] }, "oef_AccountantChngDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccountantChngDate", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Accountant Change Date" } } }, "auth_ref": [ "r58" ] }, "oef_AccountantChngDisagreementsTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccountantChngDisagreementsTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Accountant Change Disagreements [Text Block]" } } }, "auth_ref": [ "r59" ] }, "oef_AccountantChngStatementTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AccountantChngStatementTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Accountant Change Statement [Text Block]" } } }, "auth_ref": [ "r58" ] }, "oef_AdditionalIndexAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AdditionalIndexAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Additional Index [Axis]" } } }, "auth_ref": [ "r34" ] }, "oef_AdditionalIndexDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AdditionalIndexDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Additional Index [Domain]" } } }, "auth_ref": [ "r34" ] }, "oef_AddlFundStatisticsSignificanceOrLimitsTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AddlFundStatisticsSignificanceOrLimitsTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Additional Fund Statistics Significance or Limits [Text Block]" } } }, "auth_ref": [ "r48" ] }, "oef_AddlFundStatisticsTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AddlFundStatisticsTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Additional Fund Statistics [Text Block]" } } }, "auth_ref": [ "r47" ] }, "oef_AddlInfoEmail": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AddlInfoEmail", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Additional Information Email" } } }, "auth_ref": [ "r26" ] }, "oef_AddlInfoPhoneNumber": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AddlInfoPhoneNumber", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Additional Information Phone Number" } } }, "auth_ref": [ "r26" ] }, "oef_AddlInfoTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AddlInfoTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Additional Information [Text Block]" } } }, "auth_ref": [ "r24" ] }, "oef_AddlInfoWebsite": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AddlInfoWebsite", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Additional Information Website" } } }, "auth_ref": [ "r26" ] }, "oef_AdvisoryFeesPaidAmt": { "xbrltype": "monetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AdvisoryFeesPaidAmt", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Advisory Fees Paid, Amount" } } }, "auth_ref": [ "r47" ] }, "dei_AmendmentDescription": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentDescription", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Amendment Description", "documentation": "Description of changes contained within amended document." } } }, "auth_ref": [] }, "dei_AmendmentFlag": { "xbrltype": "booleanItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "AmendmentFlag", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Amendment Flag", "documentation": "Boolean flag that is true when the XBRL content amends previously-filed or accepted submission." } } }, "auth_ref": [] }, "oef_AnnlOrSemiAnnlStatementTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AnnlOrSemiAnnlStatementTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Annual or Semi-Annual Statement [Text Block]" } } }, "auth_ref": [ "r23" ] }, "us-gaap_AssetsNet": { "xbrltype": "monetaryItemType", "nsuri": "http://fasb.org/us-gaap/2025", "localname": "AssetsNet", "crdr": "debit", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Net Assets", "documentation": "Amount of net assets (liabilities)." } } }, "auth_ref": [ "r0" ] }, "oef_AverageAnnualReturnAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnAbstract", "lang": { "en-us": { "role": { "label": "Average Annual Return:" } } }, "auth_ref": [ "r62" ] }, "oef_AverageAnnualReturnLineItems": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnLineItems", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Average Annual Return [Line Items]" } } }, "auth_ref": [ "r62" ] }, "oef_AverageAnnualReturnTable": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AverageAnnualReturnTable", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Average Annual Return [Table]" } } }, "auth_ref": [ "r62" ] }, "oef_AvgAnnlRtrPct": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AvgAnnlRtrPct", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Average Annual Return, Percent" } } }, "auth_ref": [ "r41" ] }, "oef_AvgAnnlRtrTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "AvgAnnlRtrTableTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Average Annual Return [Table Text Block]" } } }, "auth_ref": [ "r41" ] }, "bfiii_BloombergUSAggregateBondC000101134IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "BloombergUSAggregateBondC000101134IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Bloomberg U S Aggregate Bond C000101134 Index [Member]" } } }, "auth_ref": [] }, "bfiii_BloombergUSAggregateBondC000101135IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "BloombergUSAggregateBondC000101135IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Bloomberg U S Aggregate Bond C000101135 Index [Member]" } } }, "auth_ref": [] }, "bfiii_BloombergUSAggregateBondC000101136IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "BloombergUSAggregateBondC000101136IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Bloomberg U S Aggregate Bond C000101136 Index [Member]" } } }, "auth_ref": [] }, "bfiii_BloombergUSAggregateBondC000201968IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "BloombergUSAggregateBondC000201968IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Bloomberg U S Aggregate Bond C000201968 Index [Member]" } } }, "auth_ref": [] }, "bfiii_BloombergUSAggregateBondIndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "BloombergUSAggregateBondIndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Bloomberg U S Aggregate Bond Index [Member]" } } }, "auth_ref": [] }, "oef_BroadBasedIndexAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BroadBasedIndexAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Broad Based Index [Axis]" } } }, "auth_ref": [ "r34" ] }, "oef_BroadBasedIndexDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "BroadBasedIndexDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Broad Based Index [Domain]" } } }, "auth_ref": [ "r34" ] }, "bfiii_C000101134Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101134Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101134 [Member]", "terseLabel": "Investor A" } } }, "auth_ref": [] }, "bfiii_C000101135Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101135Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101135 [Member]", "terseLabel": "Institutional" } } }, "auth_ref": [] }, "bfiii_C000101136Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101136Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101136 [Member]", "terseLabel": "Class K" } } }, "auth_ref": [] }, "bfiii_C000101143Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101143Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101143 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101144Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101144Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101144 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101145Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101145Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101145 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101146Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101146Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101146 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101147Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101147Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101147 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101148Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101148Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101148 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101149Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101149Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101149 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101150Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101150Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101150 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101151Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101151Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101151 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101152Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101152Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101152 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101153Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101153Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101153 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101154Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101154Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101154 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101155Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101155Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101155 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101156Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101156Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101156 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101157Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101157Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101157 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101158Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101158Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101158 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101159Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101159Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101159 [Member]" } } }, "auth_ref": [] }, "bfiii_C000101160Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000101160Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000101160 [Member]" } } }, "auth_ref": [] }, "bfiii_C000166217Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000166217Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000166217 [Member]" } } }, "auth_ref": [] }, "bfiii_C000166218Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000166218Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000166218 [Member]" } } }, "auth_ref": [] }, "bfiii_C000166219Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000166219Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000166219 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201968Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201968Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201968 [Member]", "terseLabel": "Investor P" } } }, "auth_ref": [] }, "bfiii_C000201971Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201971Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201971 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201972Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201972Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201972 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201973Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201973Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201973 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201974Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201974Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201974 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201975Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201975Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201975 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201976Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201976Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201976 [Member]" } } }, "auth_ref": [] }, "bfiii_C000201977Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000201977Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000201977 [Member]" } } }, "auth_ref": [] }, "bfiii_C000213835Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000213835Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000213835 [Member]" } } }, "auth_ref": [] }, "bfiii_C000213836Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000213836Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000213836 [Member]" } } }, "auth_ref": [] }, "bfiii_C000213837Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000213837Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000213837 [Member]" } } }, "auth_ref": [] }, "bfiii_C000213838Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000213838Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000213838 [Member]" } } }, "auth_ref": [] }, "bfiii_C000251820Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251820Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000251820 [Member]" } } }, "auth_ref": [] }, "bfiii_C000251821Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251821Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000251821 [Member]" } } }, "auth_ref": [] }, "bfiii_C000251822Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251822Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000251822 [Member]" } } }, "auth_ref": [] }, "bfiii_C000251823Member": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "C000251823Member", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "C000251823 [Member]" } } }, "auth_ref": [] }, "oef_ClassAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ClassAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Class [Axis]" } } }, "auth_ref": [ "r21" ] }, "oef_ClassName": { "xbrltype": "securityTitleItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ClassName", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Class Name" } } }, "auth_ref": [ "r26" ] }, "dei_CoverAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "CoverAbstract", "lang": { "en-us": { "role": { "documentation": "Cover page." } } }, "auth_ref": [] }, "oef_CreditQualityAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "CreditQualityAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Credit Quality [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_CreditQualityDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "CreditQualityDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Credit Quality [Domain]" } } }, "auth_ref": [ "r49" ] }, "oef_CreditQualityExplanationTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "CreditQualityExplanationTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Credit Quality Explanation [Text Block]" } } }, "auth_ref": [ "r49" ] }, "srt_CreditRatingAMBestDomain": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/srt/2025", "localname": "CreditRatingAMBestDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "auth_ref": [ "r17", "r64" ] }, "oef_CreditRatingsSelectionTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "CreditRatingsSelectionTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Credit Ratings Selection [Text Block]" } } }, "auth_ref": [ "r49" ] }, "oef_DistOfCapitalTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "DistOfCapitalTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Distribution of Capital [Text Block]" } } }, "auth_ref": [ "r43" ] }, "dei_DocumentPeriodEndDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentPeriodEndDate", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Document Period End Date", "documentation": "For the EDGAR submission types of Form 8-K: the date of the report, the date of the earliest event reported; for the EDGAR submission types of Form N-1A: the filing date; for all other submission types: the end of the reporting or transition period. The format of the date is YYYY-MM-DD." } } }, "auth_ref": [] }, "dei_DocumentType": { "xbrltype": "submissionTypeItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "DocumentType", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Document Type", "documentation": "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'." } } }, "auth_ref": [] }, "dei_EntityCentralIndexKey": { "xbrltype": "centralIndexKeyItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityCentralIndexKey", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Entity Central Index Key", "documentation": "A unique 10-digit SEC-issued value to identify entities that have filed disclosures with the SEC. It is commonly abbreviated as CIK." } } }, "auth_ref": [ "r19" ] }, "dei_EntityDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Series", "documentation": "All the names of the entities being reported upon in a document. Any legal structure used to conduct activities or to hold assets. Some examples of such structures are corporations, partnerships, limited liability companies, grantor trusts, and other trusts. This item does not include business and geographical segments which are included in the geographical or business segments domains." } } }, "auth_ref": [] }, "dei_EntityInvCompanyType": { "xbrltype": "invCompanyType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityInvCompanyType", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Entity Investment Company Type", "documentation": "One of: N-1A (Mutual Fund), N-1 (Open-End Separate Account with No Variable Annuities), N-2 (Closed-End Investment Company), N-3 (Separate Account Registered as Open-End Management Investment Company), N-4 (Variable Annuity UIT Separate Account), N-5 (Small Business Investment Company), N-6 (Variable Life UIT Separate Account), S-1 or S-3 (Face Amount Certificate Company), S-6 (UIT, Non-Insurance Product)." } } }, "auth_ref": [ "r63" ] }, "dei_EntityRegistrantName": { "xbrltype": "normalizedStringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "EntityRegistrantName", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Registrant Name", "documentation": "The exact name of the entity filing the report as specified in its charter, which is required by forms filed with the SEC." } } }, "auth_ref": [ "r19" ] }, "bfiii_EquityFundsSecuritiesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "EquityFundsSecuritiesMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Equity Funds Securities [Member]" } } }, "auth_ref": [] }, "oef_EtfDiscountNumDays": { "xbrltype": "integerItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "EtfDiscountNumDays", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "ETF Discount, Number of Days" } } }, "auth_ref": [ "r44" ] }, "oef_EtfPastPerfTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "EtfPastPerfTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "ETF Past Performance [Text Block]" } } }, "auth_ref": [ "r46" ] }, "oef_EtfPremiumDiscountTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "EtfPremiumDiscountTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "ETF Premium Discount [Text Block]" } } }, "auth_ref": [ "r44" ] }, "oef_EtfPremiumNumDays": { "xbrltype": "integerItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "EtfPremiumNumDays", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "ETF Premium, Number of Days" } } }, "auth_ref": [ "r44" ] }, "oef_EtfPurchaseExplanationTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "EtfPurchaseExplanationTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "ETF Purchase Explanation [Text Block]" } } }, "auth_ref": [ "r45" ] }, "oef_ExpenseRatioPct": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpenseRatioPct", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Expense Ratio, Percent" } } }, "auth_ref": [ "r29" ] }, "oef_ExpensesExclExtraordinaryExpensesPct": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesExclExtraordinaryExpensesPct", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Expenses Excluding Extraordinary Expenses, Percent" } } }, "auth_ref": [ "r32" ] }, "oef_ExpensesPaidAmt": { "xbrltype": "monetaryItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesPaidAmt", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Expenses Paid, Amount" } } }, "auth_ref": [ "r28" ] }, "oef_ExpensesRepresentBothMasterAndFeeder": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesRepresentBothMasterAndFeeder", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Expenses Represent Both Master and Feeder [Text]" } } }, "auth_ref": [ "r30", "r60" ] }, "oef_ExpensesShortPeriodFnTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesShortPeriodFnTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Expenses Short Period Footnote [Text Block]" } } }, "auth_ref": [ "r31" ] }, "oef_ExpensesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExpensesTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Expenses [Text Block]" } } }, "auth_ref": [ "r27" ] }, "oef_ExposureBasisExplanationTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExposureBasisExplanationTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Exposure Basis Explanation [Text Block]" } } }, "auth_ref": [ "r49" ] }, "srt_ExternalCreditRatingFitchMember": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/srt/2025", "localname": "ExternalCreditRatingFitchMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "auth_ref": [ "r17", "r64" ] }, "srt_ExternalCreditRatingMoodysMember": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/srt/2025", "localname": "ExternalCreditRatingMoodysMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "auth_ref": [ "r17", "r64" ] }, "srt_ExternalCreditRatingStandardPoorsMember": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/srt/2025", "localname": "ExternalCreditRatingStandardPoorsMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "auth_ref": [ "r17", "r64" ] }, "oef_ExtraordinaryExpensesFnTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ExtraordinaryExpensesFnTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Extraordinary Expenses Footnote [Text Block]" } } }, "auth_ref": [ "r32" ] }, "oef_FactorsAffectingPerfTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FactorsAffectingPerfTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Factors Affecting Performance [Text Block]" } } }, "auth_ref": [ "r33" ] }, "us-gaap_FixedIncomeFundsMember": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/us-gaap/2025", "localname": "FixedIncomeFundsMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Fixed Income Funds [Member]", "documentation": "Investment that pools funds from investors to invest in a combination of underlying investments, primarily fixed income investments." } } }, "auth_ref": [ "r65", "r66" ] }, "oef_FundName": { "xbrltype": "normalizedStringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "FundName", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Fund Name" } } }, "auth_ref": [ "r22" ] }, "oef_GeographicRegionAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "GeographicRegionAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Geographic Region [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_GeographicRegionDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "GeographicRegionDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Geographic Region [Domain]" } } }, "auth_ref": [ "r49" ] }, "oef_HoldingsAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HoldingsAbstract", "lang": { "en-us": { "role": { "label": "Holdings [Abstract]" } } }, "auth_ref": [ "r49" ] }, "oef_HoldingsCount": { "xbrltype": "integerItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HoldingsCount", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Holdings Count" } } }, "auth_ref": [ "r47" ] }, "oef_HoldingsLineItems": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HoldingsLineItems", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Holdings [Line Items]" } } }, "auth_ref": [ "r49" ] }, "oef_HoldingsTable": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HoldingsTable", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Holdings [Table]" } } }, "auth_ref": [ "r49" ] }, "oef_HoldingsTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "HoldingsTableTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Holdings [Text Block]" } } }, "auth_ref": [ "r49" ] }, "bfiii_IShares05YearTIPSBondETFMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "IShares05YearTIPSBondETFMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares 0 5 Year TIPS Bond ETF [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesCoreMSCITotalInternationalStockETFMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesCoreMSCITotalInternationalStockETFMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares Core MSCI Total International Stock ETF [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesEnhancedRollYieldIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesEnhancedRollYieldIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares Enhanced Roll Yield Index Fund [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesFTSENAREITAllEquityREITsIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesFTSENAREITAllEquityREITsIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares FTSE NAREIT All Equity REITs Index Fund [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesGlobalInfrastructureETFMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesGlobalInfrastructureETFMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares Global Infrastructure ETF [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesUSIntermediateCreditBondIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesUSIntermediateCreditBondIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares U S Intermediate Credit Bond Index Fund [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesUSIntermediateGovernmentBondIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesUSIntermediateGovernmentBondIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares U S Intermediate Government Bond Index Fund [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesUSLongCreditBondIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesUSLongCreditBondIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares U S Long Credit Bond Index Fund [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesUSLongGovernmentBondIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesUSLongGovernmentBondIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares U S Long Government Bond Index Fund [Member]" } } }, "auth_ref": [] }, "bfiii_ISharesUSSecuritizedBondIndexFundMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "ISharesUSSecuritizedBondIndexFundMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "iShares U S Securitized Bond Index Fund [Member]" } } }, "auth_ref": [] }, "oef_InabilityToMeetDistLevelTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "InabilityToMeetDistLevelTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Inability to Meet Distribution Level [Text Block]" } } }, "auth_ref": [ "r43" ] }, "oef_IndustrySectorAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "IndustrySectorAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Industry Sector [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_IndustrySectorDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "IndustrySectorDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Industry Sector [Domain]" } } }, "auth_ref": [ "r49" ] }, "us-gaap_InvestmentCompanyPortfolioTurnover": { "xbrltype": "percentItemType", "nsuri": "http://fasb.org/us-gaap/2025", "localname": "InvestmentCompanyPortfolioTurnover", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Investment Company Portfolio Turnover", "documentation": "Percentage of lesser of purchase or sale of portfolio securities to average value of portfolio securities owned." } } }, "auth_ref": [ "r67" ] }, "us-gaap_InvestmentTypeAxis": { "xbrltype": "stringItemType", "nsuri": "http://fasb.org/us-gaap/2025", "localname": "InvestmentTypeAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Investment Type [Axis]", "documentation": "Information by type of investments." } } }, "auth_ref": [ "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r18" ] }, "us-gaap_InvestmentTypeCategorizationMember": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/us-gaap/2025", "localname": "InvestmentTypeCategorizationMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "documentation": "Asset obtained to generate income or appreciate in value." } } }, "auth_ref": [ "r1", "r2", "r3", "r4", "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12", "r13", "r14", "r15", "r16", "r18" ] }, "bfiii_LargeCapIndexMasterPortfolioMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LargeCapIndexMasterPortfolioMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Large Cap Index Master Portfolio [Member]" } } }, "auth_ref": [] }, "oef_LargestHoldingAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LargestHoldingAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Largest Holding [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_LargestHoldingsDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LargestHoldingsDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Largest Holdings [Domain]" } } }, "auth_ref": [ "r49" ] }, "oef_LargestHoldingsTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LargestHoldingsTableTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Largest Holdings [Text Block]" } } }, "auth_ref": [ "r49" ] }, "dei_LegalEntityAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "LegalEntityAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Series [Axis]", "documentation": "The set of legal entities associated with a report." } } }, "auth_ref": [] }, "bfiii_LiabilitiesInExcessOfOtherAssetsMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LiabilitiesInExcessOfOtherAssetsMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Liabilities in Excess of Other Assets [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2030FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2030FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2030 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2035FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2035FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2035 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2040FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2040FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2040 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2045FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2045FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2045 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2050FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2050FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2050 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2055FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2055FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2055 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2060FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2060FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2060 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2065FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2065FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2065 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndex2070FundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndex2070FundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index 2070 Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "bfiii_LifePathIndexRetirementFundCustomBenchmarkMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "LifePathIndexRetirementFundCustomBenchmarkMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "LifePath Index Retirement Fund Custom Benchmark [Member]" } } }, "auth_ref": [] }, "oef_LineGraphAndTableMeasureName": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LineGraphAndTableMeasureName", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Line Graph and Table Measure Name" } } }, "auth_ref": [ "r35" ] }, "oef_LineGraphTableTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "LineGraphTableTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Line Graph [Table Text Block]" } } }, "auth_ref": [ "r34" ] }, "bfiii_MasterSmallCapIndexSeriesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "MasterSmallCapIndexSeriesMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Master Small Cap Index Series [Member]" } } }, "auth_ref": [] }, "oef_MaterialChngDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialChngDate", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Change Date" } } }, "auth_ref": [ "r39" ] }, "oef_MaterialChngDescriptionTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialChngDescriptionTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Change Description [Text Block]" } } }, "auth_ref": [ "r39" ] }, "oef_MaterialFundChngAdviserTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngAdviserTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Adviser [Text Block]" } } }, "auth_ref": [ "r56" ] }, "oef_MaterialFundChngExpensesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngExpensesTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Expenses [Text Block]" } } }, "auth_ref": [ "r53" ] }, "oef_MaterialFundChngNameTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngNameTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Name [Text Block]" } } }, "auth_ref": [ "r51" ] }, "oef_MaterialFundChngNoticeTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngNoticeTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Notice [Text Block]" } } }, "auth_ref": [ "r25" ] }, "oef_MaterialFundChngObjectivesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngObjectivesTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Objectives [Text Block]" } } }, "auth_ref": [ "r52" ] }, "oef_MaterialFundChngRisksChngTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngRisksChngTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Risks Change [Text Block]" } } }, "auth_ref": [ "r55" ] }, "oef_MaterialFundChngStrategiesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngStrategiesTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change Strategies [Text Block]" } } }, "auth_ref": [ "r54" ] }, "oef_MaterialFundChngTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaterialFundChngTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Material Fund Change [Text Block]" } } }, "auth_ref": [ "r50" ] }, "oef_MaturityAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaturityAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Maturity [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_MaturityDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "MaturityDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Maturity [Domain]" } } }, "auth_ref": [ "r49" ] }, "us-gaap_MoneyMarketFundsMember": { "xbrltype": "domainItemType", "nsuri": "http://fasb.org/us-gaap/2025", "localname": "MoneyMarketFundsMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Money Market Funds [Member]", "documentation": "Fund that invests in short-term money-market instruments, for example, but not limited to, commercial paper, banker's acceptances, repurchase agreements, government securities, certificates of deposit, and other highly liquid securities." } } }, "auth_ref": [ "r65", "r66" ] }, "oef_NoDeductionOfTaxesTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "NoDeductionOfTaxesTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "No Deduction of Taxes [Text Block]" } } }, "auth_ref": [ "r36" ] }, "dei_NoTradingSymbolFlag": { "xbrltype": "trueItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "NoTradingSymbolFlag", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "No Trading Symbol Flag", "documentation": "Boolean flag that is true only for a security having no trading symbol." } } }, "auth_ref": [] }, "bfiii_OtherAssetsLessLiabilitiesMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "OtherAssetsLessLiabilitiesMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Other Assets Less Liabilities [Member]" } } }, "auth_ref": [] }, "oef_OtherCategory1Axis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherCategory1Axis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Other Category 1 [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_OtherCategory1Domain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherCategory1Domain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Other Category 1 [Domain]" } } }, "auth_ref": [ "r49" ] }, "oef_OtherCategory2Axis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherCategory2Axis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Other Category 2 [Axis]" } } }, "auth_ref": [ "r49" ] }, "oef_OtherCategory2Domain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "OtherCategory2Domain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Other Category 2 [Domain]" } } }, "auth_ref": [ "r49" ] }, "oef_PctOfNav": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PctOfNav", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Percent of Net Asset Value" } } }, "auth_ref": [ "r49" ] }, "oef_PctOfNetLongExposure": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PctOfNetLongExposure", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Percent of Net Long Exposure" } } }, "auth_ref": [ "r49" ] }, "oef_PctOfNetShortExposure": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PctOfNetShortExposure", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Percent of Net Short Exposure" } } }, "auth_ref": [ "r49" ] }, "oef_PctOfTotalInv": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PctOfTotalInv", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Percent of Total Investments" } } }, "auth_ref": [ "r49" ] }, "oef_PctOfTotalLongExposure": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PctOfTotalLongExposure", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Percent of Total Long Exposure" } } }, "auth_ref": [ "r49" ] }, "oef_PctOfTotalShortExposure": { "xbrltype": "percentItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PctOfTotalShortExposure", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails" ], "lang": { "en-us": { "role": { "label": "Percent of Total Short Exposure" } } }, "auth_ref": [ "r49" ] }, "oef_PerfInceptionDate": { "xbrltype": "dateItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerfInceptionDate", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Performance Inception Date" } } }, "auth_ref": [ "r35" ] }, "oef_PerfTableMarketIndexChngdTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerfTableMarketIndexChngdTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Performance Table Market Index Changed [Text Block]" } } }, "auth_ref": [ "r42" ] }, "oef_PerformancePastDoesNotIndicateFuture": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PerformancePastDoesNotIndicateFuture", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Performance Past Does Not Indicate Future [Text]" } } }, "auth_ref": [ "r37", "r61" ] }, "oef_PreviousInvestmentAdviserTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PreviousInvestmentAdviserTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Previous Investment Adviser [Text Block]" } } }, "auth_ref": [ "r38" ] }, "oef_PriorMarketIndexComparisonTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "PriorMarketIndexComparisonTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Prior Market Index Comparison [Text Block]" } } }, "auth_ref": [ "r42" ] }, "bfiii_Russell1000C000101134IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "Russell1000C000101134IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Russell 1000 C000101134 Index [Member]" } } }, "auth_ref": [] }, "bfiii_Russell1000C000101135IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "Russell1000C000101135IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Russell 1000 C000101135 Index [Member]" } } }, "auth_ref": [] }, "bfiii_Russell1000C000101136IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "Russell1000C000101136IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Russell 1000 C000101136 Index [Member]" } } }, "auth_ref": [] }, "bfiii_Russell1000C000201968IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "Russell1000C000201968IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Russell 1000 C000201968 Index [Member]" } } }, "auth_ref": [] }, "bfiii_Russell1000IndexMember": { "xbrltype": "domainItemType", "nsuri": "http://www.blackrock.com/20260225", "localname": "Russell1000IndexMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Russell 1000 Index [Member]" } } }, "auth_ref": [] }, "oef_SalesLoadAxis": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "SalesLoadAxis", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Sales Load [Axis]" } } }, "auth_ref": [ "r41" ] }, "dei_SecurityExchangeName": { "xbrltype": "edgarExchangeCodeItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "SecurityExchangeName", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Security Exchange Name", "terseLabel": "Exchange", "documentation": "Name of the Exchange on which a security is registered." } } }, "auth_ref": [ "r20" ] }, "oef_ShareClassDomain": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareClassDomain", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport", "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportHoldingsDetails", "http://xbrl.sec.gov/oef/role/ShareholderReportLineGraphDetails" ], "lang": { "en-us": { "role": { "label": "Share Classes" } } }, "auth_ref": [ "r21" ] }, "oef_ShareholderReportAbstract": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderReportAbstract", "lang": { "en-us": { "role": { "label": "Shareholder Report [Abstract]" } } }, "auth_ref": [ "r41" ] }, "oef_ShareholderReportAnnualOrSemiAnnual": { "xbrltype": "shareholderReportTypeItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderReportAnnualOrSemiAnnual", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Shareholder Report Annual or Semi-Annual" } } }, "auth_ref": [ "r23" ] }, "oef_ShareholderReportLineItems": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderReportLineItems", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Shareholder Report [Line Items]" } } }, "auth_ref": [ "r41" ] }, "oef_ShareholderReportTable": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "ShareholderReportTable", "presentation": [ "http://xbrl.sec.gov/oef/role/NcsrCover", "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Shareholder Report [Table]" } } }, "auth_ref": [ "r41" ] }, "oef_SummaryOfChngLegendTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "SummaryOfChngLegendTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Summary of Change Legend [Text Block]" } } }, "auth_ref": [ "r57" ] }, "dei_TradingSymbol": { "xbrltype": "tradingSymbolItemType", "nsuri": "http://xbrl.sec.gov/dei/2025", "localname": "TradingSymbol", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Trading Symbol", "terseLabel": "Ticker", "documentation": "Trading symbol of an instrument as listed on an exchange." } } }, "auth_ref": [] }, "oef_UpdPerfInfoLocationTextBlock": { "xbrltype": "textBlockItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "UpdPerfInfoLocationTextBlock", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Updated Performance Information Location [Text Block]" } } }, "auth_ref": [ "r40" ] }, "oef_UpdProspectusEmailAddress": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "UpdProspectusEmailAddress", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Updated Prospectus Email Address" } } }, "auth_ref": [ "r57" ] }, "oef_UpdProspectusPhoneNumber": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "UpdProspectusPhoneNumber", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Updated Prospectus Phone Number" } } }, "auth_ref": [ "r57" ] }, "oef_UpdProspectusWebAddress": { "xbrltype": "stringItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "UpdProspectusWebAddress", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReport" ], "lang": { "en-us": { "role": { "label": "Updated Prospectus Web Address" } } }, "auth_ref": [ "r57" ] }, "oef_WithSalesLoadMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "WithSalesLoadMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "With Sales Load [Member]" } } }, "auth_ref": [ "r41" ] }, "oef_WithoutSalesLoadMember": { "xbrltype": "domainItemType", "nsuri": "http://xbrl.sec.gov/oef/2025", "localname": "WithoutSalesLoadMember", "presentation": [ "http://xbrl.sec.gov/oef/role/ShareholderReportAverageAnnualReturnDetails" ], "lang": { "en-us": { "role": { "label": "Without Sales Load [Member]" } } }, "auth_ref": [ "r41" ] } } } }, "std_ref": { "r0": { "role": "http://fasb.org/us-gaap/role/ref/legacyRef", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "1", "SubTopic": "30", "Topic": "205", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147479910/205-30-50-1" }, "r1": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "210", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "1", "Subparagraph": "(b)(1)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147478795/946-210-50-1" }, "r2": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "210", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "1", "Subparagraph": "(c)(1)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147478795/946-210-50-1" }, "r3": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "210", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "1", "Subparagraph": "(c)(2)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147478795/946-210-50-1" }, "r4": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "210", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "6", "Subparagraph": "(a)(1)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147478795/946-210-50-6" }, "r5": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "210", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "6", "Subparagraph": "(c)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147478795/946-210-50-6" }, "r6": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "1", "Subparagraph": "(SX 210.12-12(Column A)(Footnote 1))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-1" }, "r7": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "1", "Subparagraph": "(SX 210.12-12(Column C)(Footnote 5))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-1" }, "r8": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "2", "Subparagraph": "(SX 210.12-12A(Column C)(Footnote 4))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-2" }, "r9": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "3", "Subparagraph": "(SX 210.12-12B(Column A)(Footnote 7))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-3" }, "r10": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "3", "Subparagraph": "(SX 210.12-12B(Column C)(Footnote 2))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-3" }, "r11": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "5D", "Subparagraph": "(SX 210.12-13D(Column A)(Footnote 2)(i))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-5D" }, "r12": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "6", "Subparagraph": "(SX 210.12-14(Column F)(Footnote 7))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-6" }, "r13": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "7", "Subparagraph": "(SX 210.12-15(Column A))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-7" }, "r14": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "7", "Subparagraph": "(SX 210.12-15(Column B))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-7" }, "r15": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "7", "Subparagraph": "(SX 210.12-15(Column C))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-7" }, "r16": { "role": "http://www.xbrl.org/2003/role/disclosureRef", "Topic": "946", "SubTopic": "320", "Name": "Accounting Standards Codification", "Section": "S99", "Paragraph": "7", "Subparagraph": "(SX 210.12-15(Column D))", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477271/946-320-S99-7" }, "r17": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Topic": "326", "SubTopic": "20", "Name": "Accounting Standards Codification", "Section": "55", "Paragraph": "15", "Subparagraph": "(b)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147479294/326-20-55-15" }, "r18": { "role": "http://www.xbrl.org/2003/role/exampleRef", "Topic": "946", "SubTopic": "210", "Name": "Accounting Standards Codification", "Section": "55", "Paragraph": "1", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147477439/946-210-55-1" }, "r19": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Exchange Act", "Number": "240", "Section": "12", "Subsection": "b-2" }, "r20": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Exchange Act", "Number": "240", "Section": "12", "Subsection": "d1-1" }, "r21": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "1", "Subsection": "a", "Paragraph": "1" }, "r22": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "b", "Paragraph": "1" }, "r23": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "b", "Paragraph": "3" }, "r24": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "b", "Paragraph": "4" }, "r25": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "b", "Paragraph": "5" }, "r26": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "b", "Paragraph": "instruction", "Subparagraph": "2" }, "r27": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "c" }, "r28": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "c", "Paragraph": "ii" }, "r29": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "c", "Paragraph": "iii" }, "r30": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "c", "Paragraph": "instruction", "Sentence": "1", "Clause": "b" }, "r31": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "c", "Paragraph": "instruction", "Subparagraph": "1", "Clause": "c" }, "r32": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "c", "Paragraph": "instruction", "Subparagraph": "1", "Clause": "d" }, "r33": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "1" }, "r34": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2" }, "r35": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "i" }, "r36": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "iii", "Clause": "B" }, "r37": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "iiii", "Clause": "A" }, "r38": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "12" }, "r39": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "14" }, "r40": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "15" }, "r41": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "7" }, "r42": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "2", "Subparagraph": "instruction", "Clause": "8" }, "r43": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "3" }, "r44": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "4" }, "r45": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "4", "Subparagraph": "instruction", "Clause": "3" }, "r46": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "d", "Paragraph": "4", "Subparagraph": "instruction", "Clause": "4" }, "r47": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "e" }, "r48": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "e", "Paragraph": "instruction", "Subparagraph": "6" }, "r49": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "f" }, "r50": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g" }, "r51": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "1" }, "r52": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "2" }, "r53": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "3" }, "r54": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "4" }, "r55": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "5" }, "r56": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "6" }, "r57": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "g", "Paragraph": "instruction", "Subparagraph": "2" }, "r58": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "h", "Paragraph": "1" }, "r59": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "27A", "Subsection": "h", "Paragraph": "2" }, "r60": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "3", "Subsection": "instruction", "Paragraph": "1", "Subparagraph": "d", "Sentence": "i" }, "r61": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "i" }, "r62": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Form N-1A", "Section": "4", "Subsection": "b", "Paragraph": "2", "Subparagraph": "iii" }, "r63": { "role": "http://www.xbrl.org/2003/role/presentationRef", "Publisher": "SEC", "Name": "Regulation S-T", "Number": "232", "Section": "313" }, "r64": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Topic": "326", "SubTopic": "20", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "5", "Subparagraph": "(b)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147479319/326-20-50-5" }, "r65": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Topic": "715", "SubTopic": "20", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "1", "Subparagraph": "(d)(ii)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147480506/715-20-50-1" }, "r66": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Topic": "715", "SubTopic": "20", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "5", "Subparagraph": "(c)(ii)", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147480506/715-20-50-5" }, "r67": { "role": "http://www.xbrl.org/2009/role/commonPracticeRef", "Topic": "946", "SubTopic": "205", "Name": "Accounting Standards Codification", "Section": "50", "Paragraph": "27", "Publisher": "FASB", "URI": "https://asc.fasb.org/1943274/2147478494/946-205-50-27" } } }