| Form N-CSR Cover | 6 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | BlackRock Natural Resources Trust |
| Entity Central Index Key | 0000766555 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 6 Months Ended | |
| Oct. 31, 2024 USD ($) Holding | ||
| Shareholder Report [Line Items] | ||
| Document Type | N-CSRS | |
| Amendment Flag | false | |
| Registrant Name | BlackRock Natural Resources Trust | |
| Entity Central Index Key | 0000766555 | |
| Entity Investment Company Type | N-1A | |
| Document Period End Date | Oct. 31, 2024 | |
| C000005586 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Natural Resources Trust | |
| Class Name | Institutional Shares | |
| Trading Symbol | MAGRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BlackRock Natural Resources Trust (the “Fund”) for the period of May 1, 2024 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last six months ? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Institutional Shares $ 0.89 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 45 | |
| Expense Ratio, Percent | 0.89% | [1] |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Average Annual Return [Table Text Block] | Average annual total returns 6-Month 1 Year 5 Years 10 Years Institutional Shares 1.32 % 11.18 % 11.65 % 3.60 % MSCI All Country World Index 10.87 32.79 11.08 9.06 S&P Global Natural Resources Net Index (3.05 ) 7.61 8.39 4.89 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 172,827,349 | |
| Holdings Count | Holding | 43 | |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 43 Portfolio Turnover Rate 30 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of October 31, 2024) Industry Allocation Industry (a) Percent of Oil, Gas & Consumable Fuels 33.5 % Metals & Mining 33.5 % Containers & Packaging 13.6 % Chemicals 8.6 % Construction Materials 1.7 % Energy Equipment & Services 1.1 % Paper & Forest Products 1.0 % Food Products 1.0 % Short-Term Securities 5.4 % Other Assets Less Liabilities 0.6 % Ten largest holdings Security (b) Percent of Shell PLC 8.1 % Exxon Mobil Corp. 7.1 % TotalEnergies SE 4.5 % Wheaton Precious Metals Corp. 3.9 % Smurfit WestRock PLC 3.9 % Packaging Corp. of America 3.8 % Nutrien Ltd. 3.7 % Rio Tinto PLC 3.6 % Norsk Hydro ASA 3.5 % Glencore PLC 3.5 % (a) For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes. (b) Excludes short-term securities. | |
| Largest Holdings [Text Block] | Ten largest holdings Security (b) Percent of Shell PLC 8.1 % Exxon Mobil Corp. 7.1 % TotalEnergies SE 4.5 % Wheaton Precious Metals Corp. 3.9 % Smurfit WestRock PLC 3.9 % Packaging Corp. of America 3.8 % Nutrien Ltd. 3.7 % Rio Tinto PLC 3.6 % Norsk Hydro ASA 3.5 % Glencore PLC 3.5 % | |
| C000005583 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Natural Resources Trust | |
| Class Name | Investor A Shares | |
| Trading Symbol | MDGRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BlackRock Natural Resources Trust (the “Fund”) for the period of May 1, 2024 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last six months ? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Investor A Shares $ 1.14 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 58 | |
| Expense Ratio, Percent | 1.14% | [2] |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Average Annual Return [Table Text Block] | Average annual total returns 6-Month 1 Year 5 Years 10 Years Investor A Shares 1.19 % 10.90 % 11.34 % 3.31 % Investor A Shares (with sales charge) (4.13 ) 5.08 10.14 2.76 MSCI All Country World Index 10.87 32.79 11.08 9.06 S&P Global Natural Resources Net Index (3.05 ) 7.61 8.39 4.89 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 172,827,349 | |
| Holdings Count | Holding | 43 | |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 43 Portfolio Turnover Rate 30 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of October 31, 2024) Industry Allocation Industry (a) Percent of Oil, Gas & Consumable Fuels 33.5 % Metals & Mining 33.5 % Containers & Packaging 13.6 % Chemicals 8.6 % Construction Materials 1.7 % Energy Equipment & Services 1.1 % Paper & Forest Products 1.0 % Food Products 1.0 % Short-Term Securities 5.4 % Other Assets Less Liabilities 0.6 % Ten largest holdings Security (b) Percent of Shell PLC 8.1 % Exxon Mobil Corp. 7.1 % TotalEnergies SE 4.5 % Wheaton Precious Metals Corp. 3.9 % Smurfit WestRock PLC 3.9 % Packaging Corp. of America 3.8 % Nutrien Ltd. 3.7 % Rio Tinto PLC 3.6 % Norsk Hydro ASA 3.5 % Glencore PLC 3.5 % (a) For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes. (b) Excludes short-term securities. | |
| Largest Holdings [Text Block] | Ten largest holdings Security (b) Percent of Shell PLC 8.1 % Exxon Mobil Corp. 7.1 % TotalEnergies SE 4.5 % Wheaton Precious Metals Corp. 3.9 % Smurfit WestRock PLC 3.9 % Packaging Corp. of America 3.8 % Nutrien Ltd. 3.7 % Rio Tinto PLC 3.6 % Norsk Hydro ASA 3.5 % Glencore PLC 3.5 % | |
| C000005585 [Member] | ||
| Shareholder Report [Line Items] | ||
| Fund Name | BlackRock Natural Resources Trust | |
| Class Name | Investor C Shares | |
| Trading Symbol | MCGRX | |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about BlackRock Natural Resources Trust (the “Fund”) for the period of May 1, 2024 to October 31, 2024. | |
| Shareholder Report Annual or Semi-Annual | semi-annual shareholder report | |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports | |
| Additional Information Phone Number | (800) 441‑7762 | |
| Additional Information Website | blackrock.com/fundreports | |
| Expenses [Text Block] | What were the Fund costs for the last six months ? (based on a hypothetical $10,000 investment) Class name Costs of a $10,000 Costs paid as a percentage of a Investor C Shares $ 1.86 % (a) (a) Annualized. | |
| Expenses Paid, Amount | $ 94 | |
| Expense Ratio, Percent | 1.86% | [3] |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. | |
| Average Annual Return [Table Text Block] | Average annual total returns 6-Month 1 Year 5 Years 10 Years Investor C Shares 0.82 % 10.19 % 10.50 % 2.67 % Investor C Shares (with sales charge) (0.18 ) 9.19 10.50 2.67 MSCI All Country World Index 10.87 32.79 11.08 9.06 S&P Global Natural Resources Net Index (3.05 ) 7.61 8.39 4.89 | |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. | |
| Updated Performance Information Location [Text Block] | Visit blackrock.com | |
| Net Assets | $ 172,827,349 | |
| Holdings Count | Holding | 43 | |
| Investment Company Portfolio Turnover | 30% | |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets $ Number of Portfolio Holdings 43 Portfolio Turnover Rate 30 % | |
| Holdings [Text Block] | What did the Fund invest in? (as of October 31, 2024) Industry Allocation Industry (a) Percent of Oil, Gas & Consumable Fuels 33.5 % Metals & Mining 33.5 % Containers & Packaging 13.6 % Chemicals 8.6 % Construction Materials 1.7 % Energy Equipment & Services 1.1 % Paper & Forest Products 1.0 % Food Products 1.0 % Short-Term Securities 5.4 % Other Assets Less Liabilities 0.6 % Ten largest holdings Security (b) Percent of Shell PLC 8.1 % Exxon Mobil Corp. 7.1 % TotalEnergies SE 4.5 % Wheaton Precious Metals Corp. 3.9 % Smurfit WestRock PLC 3.9 % Packaging Corp. of America 3.8 % Nutrien Ltd. 3.7 % Rio Tinto PLC 3.6 % Norsk Hydro ASA 3.5 % Glencore PLC 3.5 % (a) For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes. (b) Excludes short-term securities. | |
| Largest Holdings [Text Block] | Ten largest holdings Security (b) Percent of Shell PLC 8.1 % Exxon Mobil Corp. 7.1 % TotalEnergies SE 4.5 % Wheaton Precious Metals Corp. 3.9 % Smurfit WestRock PLC 3.9 % Packaging Corp. of America 3.8 % Nutrien Ltd. 3.7 % Rio Tinto PLC 3.6 % Norsk Hydro ASA 3.5 % Glencore PLC 3.5 % | |
| [1]Annualized.[2]Annualized.[3]Annualized. | ||
| Shareholder Report, Line Graph (Details) | 6 Months Ended | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | |
| C000005586 [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | Institutional Shares | |||
| Average Annual Return, Percent | 1.32% | 11.18% | 11.65% | 3.60% |
| C000005583 [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | Investor A Shares (with sales charge) | |||
| Average Annual Return, Percent | (4.13%) | 5.08% | 10.14% | 2.76% |
| C000005583 [Member] | Without Sales Load [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | Investor A Shares | |||
| Average Annual Return, Percent | 1.19% | 10.90% | 11.34% | 3.31% |
| C000005585 [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | Investor C Shares (with sales charge) | |||
| Average Annual Return, Percent | (0.18%) | 9.19% | 10.50% | 2.67% |
| C000005585 [Member] | Without Sales Load [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | Investor C Shares | |||
| Average Annual Return, Percent | 0.82% | 10.19% | 10.50% | 2.67% |
| MSCI All Country World Index [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | MSCI All Country World Index | |||
| Average Annual Return, Percent | 10.87% | 32.79% | 11.08% | 9.06% |
| S And P Global Natural Resources Net Index [Member] | ||||
| Account Value [Line Items] | ||||
| Line Graph and Table Measure Name | S&P Global Natural Resources Net Index | |||
| Average Annual Return, Percent | (3.05%) | 7.61% | 8.39% | 4.89% |
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 | |
| C000005586 [Member] | Shell PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.10% | [1] |
| C000005586 [Member] | Exxon Mobil Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.10% | [1] |
| C000005586 [Member] | TotalEnergies SE [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.50% | [1] |
| C000005586 [Member] | Wheaton Precious Metals Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | [1] |
| C000005586 [Member] | Smurfit WestRock PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | [1] |
| C000005586 [Member] | Packaging Corp of America [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.80% | [1] |
| C000005586 [Member] | Nutrien Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | [1] |
| C000005586 [Member] | Rio Tinto PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.60% | [1] |
| C000005586 [Member] | Norsk Hydro ASA [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [1] |
| C000005586 [Member] | Glencore PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [1] |
| C000005586 [Member] | Oil Gas And Consumable Fuels [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 33.50% | [2] |
| C000005586 [Member] | Metals And Mining [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 33.50% | [2] |
| C000005586 [Member] | Chemicals Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.60% | [2] |
| C000005586 [Member] | Construction Materials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [2] |
| C000005586 [Member] | Energy Equipment And Services [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | [2] |
| C000005586 [Member] | Paper And Forest Products [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [2] |
| C000005586 [Member] | Food Products [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [2] |
| C000005586 [Member] | Container and Packaging Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.60% | [2] |
| C000005586 [Member] | Other Assets Less Liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.60% | [2] |
| C000005586 [Member] | Short-Term Investments [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.40% | [2] |
| C000005583 [Member] | Shell PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.10% | [3] |
| C000005583 [Member] | Exxon Mobil Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.10% | [3] |
| C000005583 [Member] | TotalEnergies SE [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.50% | [3] |
| C000005583 [Member] | Wheaton Precious Metals Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | [3] |
| C000005583 [Member] | Smurfit WestRock PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | [3] |
| C000005583 [Member] | Packaging Corp of America [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.80% | [3] |
| C000005583 [Member] | Nutrien Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | [3] |
| C000005583 [Member] | Rio Tinto PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.60% | [3] |
| C000005583 [Member] | Norsk Hydro ASA [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [3] |
| C000005583 [Member] | Glencore PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [3] |
| C000005583 [Member] | Oil Gas And Consumable Fuels [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 33.50% | [4] |
| C000005583 [Member] | Metals And Mining [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 33.50% | [4] |
| C000005583 [Member] | Chemicals Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.60% | [4] |
| C000005583 [Member] | Construction Materials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [4] |
| C000005583 [Member] | Energy Equipment And Services [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | [4] |
| C000005583 [Member] | Paper And Forest Products [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [4] |
| C000005583 [Member] | Food Products [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [4] |
| C000005583 [Member] | Container and Packaging Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.60% | [4] |
| C000005583 [Member] | Other Assets Less Liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.60% | [4] |
| C000005583 [Member] | Short-Term Investments [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.40% | [4] |
| C000005585 [Member] | Shell PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.10% | [5] |
| C000005585 [Member] | Exxon Mobil Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 7.10% | [5] |
| C000005585 [Member] | TotalEnergies SE [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 4.50% | [5] |
| C000005585 [Member] | Wheaton Precious Metals Corp [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | [5] |
| C000005585 [Member] | Smurfit WestRock PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.90% | [5] |
| C000005585 [Member] | Packaging Corp of America [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.80% | [5] |
| C000005585 [Member] | Nutrien Ltd [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.70% | [5] |
| C000005585 [Member] | Rio Tinto PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.60% | [5] |
| C000005585 [Member] | Norsk Hydro ASA [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [5] |
| C000005585 [Member] | Glencore PLC [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 3.50% | [5] |
| C000005585 [Member] | Oil Gas And Consumable Fuels [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 33.50% | [6] |
| C000005585 [Member] | Metals And Mining [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 33.50% | [6] |
| C000005585 [Member] | Chemicals Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 8.60% | [6] |
| C000005585 [Member] | Construction Materials [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.70% | [6] |
| C000005585 [Member] | Energy Equipment And Services [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1.10% | [6] |
| C000005585 [Member] | Paper And Forest Products [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [6] |
| C000005585 [Member] | Food Products [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 1% | [6] |
| C000005585 [Member] | Container and Packaging Sector [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 13.60% | [6] |
| C000005585 [Member] | Other Assets Less Liabilities [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 0.60% | [6] |
| C000005585 [Member] | Short-Term Investments [Member] | ||
| Holdings [Line Items] | ||
| Percent of Net Asset Value | 5.40% | [6] |
| [1]Excludes short-term securities.[2]For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes.[3]Excludes short-term securities.[4]For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes.[5]Excludes short-term securities.[6]For purposes of this report, industry sub-classifications may differ from those utilized by the Fund for compliance purposes. | ||
