Investor A C Institutional and Class R [Member] Investment Objectives and Goals - Investor A, C, Institutional and Class R - BlackRock LifePath Dynamic 2040 Fund |
Dec. 31, 2025 |
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| Prospectus [Line Items] | |
| Risk/Return [Heading] | Fund Overview Key Facts About BlackRock LifePath® Dynamic 2040 Fund |
| Objective [Heading] | Investment Objective |
| Objective, Primary [Text Block] | The investment objective of BlackRock LifePath® Dynamic 2040 Fund (“LifePath Dynamic 2040 Fund” or the “Fund”), a series of BlackRock Funds III (the “Trust”), is to seek to provide for retirement outcomes based on quantitatively measured risk. In pursuit of this objective, the Fund will be broadly diversified across global asset classes, with asset allocations becoming more conservative over time.
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