v3.25.2
Shareholder Report
 6 Months Ended
May 31, 2025
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, 2025
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 (the “Fund”) for the period of  December 1, 2024 to May 31, 2025.
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
$81
1.69%
[1]
Expenses Paid, Amount $ 81
Expense Ratio, Percent 1.69%
Updated Performance Information Location [Text Block]
Visit https://www.maingatefunds.com/individual_investors/fund_literature for more recent performance information.
Net Assets $ 807,967,022
Holdings Count | $ / shares 16
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Net Assets
$807,967,022
Number of Holdings
16
Portfolio Turnover
10%
Holdings [Text Block]
Top 10 Issuers
Net Inst
MPLX, L.P.
13.6%
Energy Transfer, L.P.
13.3%
Western Midstream Partners, L.P.
12.3%
Targa Resources Corp.
11.0%
Williams Companies, Inc.
9.3%
Plains GP Holdings, L.P.
8.6%
Cheniere Energy, Inc.
8.2%
Enterprise Products Partners, L.P.
8.0%
ONEOK, Inc.
7.3%
Genesis Energy, L.P.
3.0%
image
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 (the “Fund”) for the period of  December 1, 2024 to May 31, 2025.
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
$117
2.44%
[2]
Expenses Paid, Amount $ 117
Expense Ratio, Percent 2.44%
Updated Performance Information Location [Text Block]
Visit https://www.maingatefunds.com/individual_investors/fund_literature for more recent performance information.
Net Assets $ 807,967,022
Holdings Count | $ / shares 16
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Net Assets
$807,967,022
Number of Holdings
16
Portfolio Turnover
10%
Holdings [Text Block]
Top 10 Issuers
Net Inst
MPLX, L.P.
13.6%
Energy Transfer, L.P.
13.3%
Western Midstream Partners, L.P.
12.3%
Targa Resources Corp.
11.0%
Williams Companies, Inc.
9.3%
Plains GP Holdings, L.P.
8.6%
Cheniere Energy, Inc.
8.2%
Enterprise Products Partners, L.P.
8.0%
ONEOK, Inc.
7.3%
Genesis Energy, L.P.
3.0%
image
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 (the “Fund”) for the period of  December 1, 2024 to May 31, 2025.
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
$69
1.44%
[3]
Expenses Paid, Amount $ 69
Expense Ratio, Percent 1.44%
Updated Performance Information Location [Text Block]
Visit https://www.maingatefunds.com/individual_investors/fund_literature for more recent performance information.
Net Assets $ 807,967,022
Holdings Count | $ / shares 16
Investment Company Portfolio Turnover 10.00%
Additional Fund Statistics [Text Block]
KEY FUND STATISTICS (as of May 31, 2025)
Net Assets
$807,967,022
Number of Holdings
16
Portfolio Turnover
10%
Holdings [Text Block]
Top 10 Issuers
Net Inst
MPLX, L.P.
13.6%
Energy Transfer, L.P.
13.3%
Western Midstream Partners, L.P.
12.3%
Targa Resources Corp.
11.0%
Williams Companies, Inc.
9.3%
Plains GP Holdings, L.P.
8.6%
Cheniere Energy, Inc.
8.2%
Enterprise Products Partners, L.P.
8.0%
ONEOK, Inc.
7.3%
Genesis Energy, L.P.
3.0%
image
Updated Prospectus Web Address https://www.maingatefunds.com/individual_investors/fund_literature
[1]
* Annualized
[2]
* Annualized
[3]
* Annualized