| Form N-CSR Cover | 12 Months Ended |
| Sep. 30, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Northern Lights Fund Trust III |
| Entity Central Index Key | 0001537140 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| Shareholder Report | 12 Months Ended |
| Sep. 30, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Northern Lights Fund Trust III |
| Entity Central Index Key | 0001537140 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Sep. 30, 2024 |
| C000129981 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Covered Bridge Fund |
| Trading Symbol | TCBAX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Covered Bridge Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at thecoveredbridgefund.com/literature/ |
| Additional Information Phone Number | (855) 525-2151 |
| Additional Information Website | thecoveredbridgefund.com/literature/ |
| Expenses [Text Block] | What were the Fund’s costs for the last year? (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 $187 1.73% |
| Expenses Paid, Amount | $ 187 |
| Expense Ratio, Percent | 1.73% |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of how the Fund will perform in the future. |
| Line Graph [Table Text Block] | The Covered Bridge Fund - with load CBOE S&P 500 ® Sep-2014 $9,475 $10,000 Sep-2015 $8,800 $10,036 Sep-2016 $9,995 $10,888 Sep-2017 $11,066 $12,285 Sep-2018 $12,032 $13,484 Sep-2019 $12,343 $13,335 Sep-2020 $10,651 $12,580 Sep-2021 $14,481 $15,235 Sep-2022 $13,379 $13,527 Sep-2023 $14,817 $15,506 Sep-2024 $17,283 $18,344 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years The Covered Bridge Fund Without Load 16.65% 6.96% 6.20% With Load 10.59% 5.81% 5.62% CBOE S&P 500 ® 18.31% 6.59% 6.25% The Fund's past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Material Change Date | Sep. 30, 2024 |
| AssetsNet | $ 110,164,554 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 1,048,452 |
| InvestmentCompanyPortfolioTurnover | 125% |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $110,164,554 Number of Portfolio Holdings 113 Advisory Fee (net of waivers) $1,048,452 Portfolio Turnover 125% |
| Holdings [Text Block] | Asset Weighting (% of total investments) Value Value Common Stocks 95.8% Money Market Funds 3.9% Purchased Options 0.3% |
| Material Fund Change [Text Block] | Material Fund Changes No material changes occurred during the year ended September 30, 2024. |
| C000129983 | |
| Shareholder Report [Line Items] | |
| Fund Name | The Covered Bridge Fund |
| Trading Symbol | TCBIX |
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about The Covered Bridge Fund for the period of October 1, 2023 to September 30, 2024. |
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at thecoveredbridgefund.com/literature/ |
| Additional Information Phone Number | (855) 525-2151 |
| Additional Information Website | thecoveredbridgefund.com/literature/ |
| Expenses [Text Block] | What were the Fund’s costs for the last year? (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 $161 1.48% |
| Expenses Paid, Amount | $ 161 |
| Expense Ratio, Percent | 1.48% |
| Performance Past Does Not Indicate Future [Text] | The Fund's past performance is not a good predictor of how the Fund will perform in the future. |
| Line Graph [Table Text Block] | The Covered Bridge Fund CBOE S&P 500 ® Sep-2014 $10,000 $10,000 Sep-2015 $9,320 $10,036 Sep-2016 $10,600 $10,888 Sep-2017 $11,767 $12,285 Sep-2018 $12,826 $13,484 Sep-2019 $13,193 $13,335 Sep-2020 $11,422 $12,580 Sep-2021 $15,560 $15,235 Sep-2022 $14,408 $13,527 Sep-2023 $15,988 $15,506 Sep-2024 $18,701 $18,344 |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year 5 Years 10 Years The Covered Bridge Fund 16.97% 7.23% 6.46% CBOE S&P 500 ® 18.31% 6.59% 6.25% The Fund's past performance is not a good predictor of how the Fund will perform in the future. The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| No Deduction of Taxes [Text Block] | The graph and table do not reflect the deduction of taxes that a shareholder would pay on fund distributions or redemption of fund shares. |
| Material Change Date | Sep. 30, 2024 |
| AssetsNet | $ 110,164,554 |
| Holdings Count | Holding | 113 |
| Advisory Fees Paid, Amount | $ 1,048,452 |
| InvestmentCompanyPortfolioTurnover | 125% |
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $110,164,554 Number of Portfolio Holdings 113 Advisory Fee (net of waivers) $1,048,452 Portfolio Turnover 125% |
| Holdings [Text Block] | Asset Weighting (% of total investments) Value Value Common Stocks 95.8% Money Market Funds 3.9% Purchased Options 0.3% |
| Material Fund Change [Text Block] | Material Fund Changes No material changes occurred during the year ended September 30, 2024. |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||
| Sep. 30, 2014 | Sep. 30, 2024 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2016 | Sep. 30, 2015 | |
| C000129981 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | The Covered Bridge Fund | ||||||||||
| Account Value | $ 9,475 | $ 17,283 | $ 14,817 | $ 13,379 | $ 14,481 | $ 10,651 | $ 12,343 | $ 12,032 | $ 11,066 | $ 9,995 | $ 8,800 |
| C000129983 | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | The Covered Bridge Fund | ||||||||||
| Account Value | $ 10,000 | 18,701 | 15,988 | 14,408 | 15,560 | 11,422 | 13,193 | 12,826 | 11,767 | 10,600 | 9,320 |
| CBOE S&P 500 BUYWRITE INDEX - BXM | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ®</sup> BuyWrite Index" id="sjs-B13">CBOE S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> BuyWrite Index | ||||||||||
| Account Value | $ 10,000 | 18,344 | 15,506 | 13,527 | 15,235 | 12,580 | 13,335 | 13,484 | 12,285 | 10,888 | 10,036 |
| CBOE S&P 500 BUYWRITE INDEX - BXM | |||||||||||
| Account Value [Line Items] | |||||||||||
| Line Graph and Table Measure Name | ®</sup> BuyWrite Index" id="sjs-B17">CBOE S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> BuyWrite Index | ||||||||||
| Account Value | $ 10,000 | $ 18,344 | $ 15,506 | $ 13,527 | $ 15,235 | $ 12,580 | $ 13,335 | $ 13,484 | $ 12,285 | $ 10,888 | $ 10,036 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 60 Months Ended | 120 Months Ended | |
| Sep. 30, 2024 | Sep. 30, 2014 | Sep. 30, 2024 | Sep. 30, 2024 | |
| C000129981 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | The Covered Bridge Fund | |||
| Average Annual Return, Percent | 10.59% | 5.81% | 5.62% | |
| C000129983 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | The Covered Bridge Fund | |||
| Without Sales Load [Member] | C000129981 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 16.65% | 6.96% | 6.20% | |
| Without Sales Load [Member] | C000129983 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 16.97% | 7.23% | 6.46% | |
| CBOE S&P 500 BUYWRITE INDEX - BXM | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup> BuyWrite Index" id="sjs-C18">CBOE S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> BuyWrite Index | |||
| Average Annual Return, Percent | 18.31% | 6.59% | 6.25% | |
| CBOE S&P 500 BUYWRITE INDEX - BXM | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup> BuyWrite Index" id="sjs-C22">CBOE S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center;">®</sup> BuyWrite Index | |||
| Average Annual Return, Percent | 18.31% | 6.59% | 6.25% | |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000129981 | 4812C2734 | JPMorgan US Treasury Plus Money Market Fund, Class L | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000129981 | 747525103 | QUALCOMM, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000129981 | 478160104 | Johnson & Johnson | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000129981 | 911312106 | United Parcel Service, Inc., B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000129981 | 110122108 | Bristol-Myers Squibb Company | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000129981 | 855244109 | Starbucks Corporation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129981 | 717081103 | Pfizer, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129981 | 427866108 | Hershey Company (The) | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129981 | G1151C101 | Accenture plc, Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129981 | 902973304 | US Bancorp | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000129981 | ACN C340_20241021_S_IBEquity Option | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.90%) |
| C000129981 | 962166104Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000129981 | 31846V328Money Market | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000129981 | 75513E101Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000129981 | 26441C204Utilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000129981 | 20030N101Communications | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000129981 | 418056107Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000129981 | 067901108Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000129981 | 30231G102Energy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| C000129981 | 617446448Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| C000129981 | 375558103Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.20% |
| C000129981 | 459200101Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000129981 | 931427108Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000129981 | InvestmentType_Common Stocks | |
| Holdings [Line Items] | |
| Percent of Total Investments | 95.80% |
| C000129981 | InvestmentType_Money Market Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000129981 | InvestmentType_Options | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000129983 | 4812C2734 | JPMorgan US Treasury Plus Money Market Fund, Class L | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.80% |
| C000129983 | 747525103 | QUALCOMM, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.10% |
| C000129983 | 478160104 | Johnson & Johnson | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3% |
| C000129983 | 911312106 | United Parcel Service, Inc., B | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000129983 | 110122108 | Bristol-Myers Squibb Company | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.80% |
| C000129983 | 855244109 | Starbucks Corporation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129983 | 717081103 | Pfizer, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129983 | 427866108 | Hershey Company (The) | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129983 | G1151C101 | Accenture plc, Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.60% |
| C000129983 | 902973304 | US Bancorp | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.50% |
| C000129983 | ACN C340_20241021_S_IBEquity Option | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (0.90%) |
| C000129983 | 962166104Real Estate | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.40% |
| C000129983 | 31846V328Money Market | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.90% |
| C000129983 | 75513E101Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.30% |
| C000129983 | 26441C204Utilities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.80% |
| C000129983 | 20030N101Communications | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000129983 | 418056107Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 6.70% |
| C000129983 | 067901108Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 7.10% |
| C000129983 | 30231G102Energy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 9.50% |
| C000129983 | 617446448Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.70% |
| C000129983 | 375558103Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12.20% |
| C000129983 | 459200101Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000129983 | 931427108Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 15.20% |
| C000129983 | InvestmentType_Common Stocks | |
| Holdings [Line Items] | |
| Percent of Total Investments | 95.80% |
| C000129983 | InvestmentType_Money Market Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000129983 | InvestmentType_Options | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
