| Form N-CSR Cover | 6 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | MainGate Trust |
| Entity Central Index Key | 0001505064 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 6 Months Ended |
| May 31, 2024 USD ($) $ / shares | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | MainGate Trust |
| Entity Central Index Key | 0001505064 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Class A | |
| Shareholder Report [Line Items] | |
| Fund Name | MainGate MLP Fund |
| Class Name | Class A |
| Trading Symbol | AMLPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the MainGate MLP Fund for the period of December 1, 2023 to May 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 https://www.maingatefunds.com/ individual_investors/fund_literature . You can also request this information by contacting us at 1-855-MLP-FUND (1-855-657-3863) . |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 1-855-MLP-FUND (1-855-657-3863) |
| Additional Information Website | https://www.maingatefunds.com/individual_investors/fund_literature |
| 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 investment Costs paid as a percentage of a $10,000 investment Class A $92 1.73% |
| Expenses Paid, Amount | $ 92 |
| Expense Ratio, Percent | 1.73% |
| Updated Performance Information Location [Text Block] | Visit https://www.maingatefunds.com/individual_investors/fund_literature for more recent performance information. |
| Net Assets | $ 763,716,377 |
| Holdings Count | $ / shares | 18 |
| Investment Company Portfolio Turnover | 1% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of May 31, 2024) Net Assets $763,716,377 Number of Holdings 18 Portfolio Turnover 1% |
| Holdings [Text Block] | Top 10 Issuers (%) Western Midstream Partners, L.P. 13.4% Targa Resources Corp. 13.2% Energy Transfer, L.P. 12.0% MPLX, L.P. 11.9% EnLink Midstream, LLC 9.7% Enterprise Products Partners, L.P. 8.2% ONEOK, Inc. 7.1% Plains GP Holdings, L.P. 5.9% Plains All American Pipeline, L.P. 3.9% Cheniere Energy, Inc. 3.7% |
| Updated Prospectus Web Address | https://www.maingatefunds.com/individual_investors/fund_literature |
| Class C | |
| Shareholder Report [Line Items] | |
| Fund Name | MainGate MLP Fund |
| Class Name | Class C |
| Trading Symbol | MLCPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the MainGate MLP Fund for the period of December 1, 2023 to May 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 https://www.maingatefunds.com/ individual_investors/fund_literature . You can also request this information by contacting us at 1-855-MLP-FUND (1-855-657-3863) . |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 1-855-MLP-FUND (1-855-657-3863) |
| Additional Information Website | https://www.maingatefunds.com/individual_investors/fund_literature |
| 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 investment Costs paid as a percentage of a $10,000 investment Class C $131 2.48% |
| Expenses Paid, Amount | $ 131 |
| Expense Ratio, Percent | 2.48% |
| Updated Performance Information Location [Text Block] | Visit https://www.maingatefunds.com/individual_investors/fund_literature for more recent performance information. |
| Net Assets | $ 763,716,377 |
| Holdings Count | $ / shares | 18 |
| Investment Company Portfolio Turnover | 1% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of May 31, 2024) Net Assets $763,716,377 Number of Holdings 18 Portfolio Turnover 1% |
| Holdings [Text Block] | Top 10 Issuers (%) Western Midstream Partners, L.P. 13.4% Targa Resources Corp. 13.2% Energy Transfer, L.P. 12.0% MPLX, L.P. 11.9% EnLink Midstream, LLC 9.7% Enterprise Products Partners, L.P. 8.2% ONEOK, Inc. 7.1% Plains GP Holdings, L.P. 5.9% Plains All American Pipeline, L.P. 3.9% Cheniere Energy, Inc. 3.7% |
| Updated Prospectus Web Address | https://www.maingatefunds.com/individual_investors/fund_literature |
| Class I | |
| Shareholder Report [Line Items] | |
| Fund Name | MainGate MLP Fund |
| Class Name | Class I |
| Trading Symbol | IMLPX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about the MainGate MLP Fund for the period of December 1, 2023 to May 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 https://www.maingatefunds.com/ individual_investors/fund_literature . You can also request this information by contacting us at 1-855-MLP-FUND (1-855-657-3863) . |
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. |
| Additional Information Phone Number | 1-855-MLP-FUND (1-855-657-3863) |
| Additional Information Website | https://www.maingatefunds.com/individual_investors/fund_literature |
| 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 investment Costs paid as a percentage of a $10,000 investment Class I $78 1.48% |
| Expenses Paid, Amount | $ 78 |
| Expense Ratio, Percent | 1.48% |
| Updated Performance Information Location [Text Block] | Visit https://www.maingatefunds.com/individual_investors/fund_literature for more recent performance information. |
| Net Assets | $ 763,716,377 |
| Holdings Count | $ / shares | 18 |
| Investment Company Portfolio Turnover | 1% |
| Additional Fund Statistics [Text Block] | KEY FUND STATISTICS (as of May 31, 2024) Net Assets $763,716,377 Number of Holdings 18 Portfolio Turnover 1% |
| Holdings [Text Block] | Top 10 Issuers (%) Western Midstream Partners, L.P. 13.4% Targa Resources Corp. 13.2% Energy Transfer, L.P. 12.0% MPLX, L.P. 11.9% EnLink Midstream, LLC 9.7% Enterprise Products Partners, L.P. 8.2% ONEOK, Inc. 7.1% Plains GP Holdings, L.P. 5.9% Plains All American Pipeline, L.P. 3.9% Cheniere Energy, Inc. 3.7% |
| Updated Prospectus Web Address | https://www.maingatefunds.com/individual_investors/fund_literature |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| Class A | Western Midstream Partners, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.40% |
| Class A | Targa Resources Corp. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| Class A | Energy Transfer, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| Class A | MPLX, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| Class A | EnLink Midstream, LLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| Class A | Enterprise Products Partners, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| Class A | ONEOK, Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| Class A | Plains GP Holdings, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| Class A | Plains All American Pipeline, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| Class A | Cheniere Energy, Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| Class A | Natural Gas Gathering/Processing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.90% |
| Class A | Natural Gas/Natural Gas Liquid Pipelines and Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.30% |
| Class A | Crude/Refined Products Pipelines and Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.80% |
| Class C | Western Midstream Partners, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.40% |
| Class C | Targa Resources Corp. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| Class C | Energy Transfer, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| Class C | MPLX, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| Class C | EnLink Midstream, LLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| Class C | Enterprise Products Partners, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| Class C | ONEOK, Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| Class C | Plains GP Holdings, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| Class C | Plains All American Pipeline, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| Class C | Cheniere Energy, Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| Class C | Natural Gas Gathering/Processing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.90% |
| Class C | Natural Gas/Natural Gas Liquid Pipelines and Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.30% |
| Class C | Crude/Refined Products Pipelines and Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.80% |
| Class I | Western Midstream Partners, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.40% |
| Class I | Targa Resources Corp. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| Class I | Energy Transfer, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
| Class I | MPLX, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.90% |
| Class I | EnLink Midstream, LLC [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| Class I | Enterprise Products Partners, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.20% |
| Class I | ONEOK, Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| Class I | Plains GP Holdings, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| Class I | Plains All American Pipeline, L.P. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| Class I | Cheniere Energy, Inc. [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.70% |
| Class I | Natural Gas Gathering/Processing [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 38.90% |
| Class I | Natural Gas/Natural Gas Liquid Pipelines and Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.30% |
| Class I | Crude/Refined Products Pipelines and Storage [Member] | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.80% |
