| 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 | 9 Months Ended | 10 Months Ended | 12 Months Ended | 120 Months Ended |
| Sep. 30, 2024 USD ($) Holding | Sep. 30, 2024 USD ($) Holding | Sep. 30, 2024 USD ($) Holding | Sep. 30, 2024 USD ($) 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 | |||
| C000246525 | ||||
| Shareholder Report [Line Items] | ||||
| Fund Name | Counterpoint Quantitative Equity ETF | |||
| Trading Symbol | CPAI | |||
| Security Exchange Name | NYSEArca | |||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Counterpoint Quantitative Equity ETF for the period of November 28, 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 https://counterpointfunds.com/resources/ | |||
| Additional Information Phone Number | 1-844-509-2775 | |||
| Additional Information Website | https://counterpointfunds.com/resources/ | |||
| Expenses [Text Block] | What were the Fund’s costs for the reporting period? (based on a hypothetical $10,000 investment) Fund Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Counterpoint Quantitative Equity ETF $74 0.75% Footnote Reference The cost of a $10,000 investment would have been higher than the amount shown above had it been a full reporting period. * Annualized | |||
| Expenses Paid, Amount | $ 74 | |||
| Expense Ratio, Percent | 0.75% | |||
| 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. | |||
| Average Annual Return [Table Text Block] | Average Annual Total Returns Since Inception (November 28, 2023) Counterpoint Quantitative Equity ETF - NAV 34.12% S&P 1000 ® 24.56% 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. | |||
| Performance Inception Date | Nov. 28, 2023 | |||
| 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 | $ 38,875,324 | $ 38,875,324 | $ 38,875,324 | $ 38,875,324 |
| Holdings Count | Holding | 51 | 51 | 51 | 51 |
| Advisory Fees Paid, Amount | $ 0 | |||
| InvestmentCompanyPortfolioTurnover | 308% | |||
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $38,875,324 Number of Portfolio Holdings 51 Advisory Fee (net of waivers) $0 Portfolio Turnover 308% | |||
| Holdings [Text Block] | Asset Weighting (% of total investments) Value Value Common Stocks 98.9% Money Market Funds 1.1% | |||
| C000216396 | ||||
| Shareholder Report [Line Items] | ||||
| Fund Name | Counterpoint High Yield Trend ETF | |||
| Trading Symbol | HYTR | |||
| Security Exchange Name | NYSEArca | |||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about Counterpoint High Yield Trend ETF for the period of January 1, 2024 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 https://counterpointfunds.com/resources/ | |||
| Material Fund Change Notice [Text Block] | This report describes changes to the Fund that occurred during the reporting period. | |||
| Additional Information Phone Number | 1-844-509-2775 | |||
| Additional Information Website | https://counterpointfunds.com/resources/ | |||
| Expenses [Text Block] | What were the Fund’s costs for the last year? (based on a hypothetical $10,000 investment) Fund Name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment Counterpoint High Yield Trend ETF $47 0.60% Footnote Reference * Annualized | |||
| Expenses Paid, Amount | $ 47 | |||
| Expense Ratio, Percent | 0.60% | |||
| 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] | Counterpoint High Yield Trend ETF - NAV CP High Yield Trend Index Bloomberg U.S. Aggregate Bond Index 01/21/20 $10,000 $10,000 $10,000 09/30/20 $9,427 $9,467 $10,590 09/30/21 $10,191 $10,300 $10,495 09/30/22 $9,049 $9,199 $8,963 09/30/23 $9,302 $9,561 $9,021 09/30/24 $10,541 $10,918 $10,065 | |||
| Average Annual Return [Table Text Block] | Average Annual Total Returns 1 Year Since Inception (January 21, 2020) Counterpoint High Yield Trend ETF - NAV 13.32% 1.13% CP High Yield Trend Index 14.18% 1.89% Bloomberg U.S. Aggregate Bond Index 11.57% 0.14% 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. | |||
| Performance Inception Date | Jan. 21, 2020 | |||
| 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. | |||
| AssetsNet | $ 25,493,142 | $ 25,493,142 | $ 25,493,142 | $ 25,493,142 |
| Holdings Count | Holding | 9 | 9 | 9 | 9 |
| Advisory Fees Paid, Amount | $ 0 | |||
| InvestmentCompanyPortfolioTurnover | 0% | |||
| Additional Fund Statistics [Text Block] | Fund Statistics Net Assets $25,493,142 Number of Portfolio Holdings 9 Advisory Fee (net of waivers) $0 Portfolio Turnover 0% | |||
| Holdings [Text Block] | Asset Weighting (% of total investments) Value Value Exchange-Traded Funds 7.9% Money Market Funds 2.4% U.S. Government & Agencies 89.7% | |||
| Material Fund Change [Text Block] | Material Fund Changes This is a summary of certain changes to the Fund since January 1, 2024. For more complete information, you may review the Fund’s next prospectus, which we expect to be available by February 1, 2025 at https://counterpointfunds.com/resources/ On May 1, 2024, the Fund changed its name from “CP High Yield Trend ETF” to “Counterpoint High Yield Trend ETF.” On June 30, 2024, the Fund changed its non-fundamental policy on how it invests at least 80% of its net assets. The Fund began to invest at least 80% of its assets, plus borrowings for investment purposes, in the constituents of the CP High Yield Trend Index, or economic equivalents thereto, including total return swaps on the returns of the CP High Yield Trend Index. As a result, total return swap risk—the risk that adverse price movements in a swap can cause a loss greater than the Fund’s initial investment in the swap—became a principal investment risk of the Fund. Effective August 21, 2024, the fiscal year end of the Fund was moved to September 30. |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | ||||||||||||||||
| Nov. 28, 2023 | Jan. 21, 2020 | Sep. 30, 2024 | Aug. 31, 2024 | Jul. 31, 2024 | Jun. 30, 2024 | May 31, 2024 | Apr. 30, 2024 | Mar. 31, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Sep. 30, 2020 | |
| C000246525 | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Counterpoint Quantitative Equity ETF | ||||||||||||||||
| Account Value | $ 10,000 | $ 13,412 | $ 12,820 | $ 12,836 | $ 12,491 | $ 12,615 | $ 11,595 | $ 11,923 | $ 11,295 | $ 10,826 | $ 10,722 | $ 10,056 | |||||
| C000216396 | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Counterpoint High Yield Trend ETF | ||||||||||||||||
| Account Value | $ 10,000 | $ 10,541 | $ 9,302 | $ 9,049 | $ 10,191 | $ 9,427 | |||||||||||
| S&P 1000 Total Return | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | ®</sup> Index" id="sjs-B13">S&P 1000<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> Index | ||||||||||||||||
| Account Value | $ 10,000 | 12,456 | $ 12,325 | $ 12,388 | $ 11,540 | $ 11,750 | $ 11,235 | $ 11,939 | $ 11,382 | $ 10,826 | $ 11,093 | $ 10,089 | |||||
| Bloomberg U.S. Aggregate Bond Index | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||||||||||||||
| Account Value | $ 10,000 | 10,065 | 9,021 | 8,963 | 10,495 | 10,590 | |||||||||||
| CP High Yield Trend Index | |||||||||||||||||
| Account Value [Line Items] | |||||||||||||||||
| Line Graph and Table Measure Name | CP High Yield Trend Index | ||||||||||||||||
| Account Value | $ 10,000 | $ 10,918 | $ 9,561 | $ 9,199 | $ 10,300 | $ 9,467 |
| Shareholder Report, Average Annual Return (Details) | 10 Months Ended | 12 Months Ended | 56 Months Ended | ||
| Nov. 28, 2023 | Jan. 21, 2020 | Sep. 30, 2024 | Sep. 30, 2024 | Sep. 30, 2024 | |
| C000246525 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Counterpoint Quantitative Equity ETF | ||||
| C000216396 | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Counterpoint High Yield Trend ETF | ||||
| Without Sales Load [Member] | C000246525 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 34.12% | ||||
| Without Sales Load [Member] | C000216396 | |||||
| Average Annual Return [Line Items] | |||||
| Average Annual Return, Percent | 13.32% | 1.13% | |||
| S&P 1000 Total Return | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | ®</sup> Index" id="sjs-B17">S&P 1000<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> Index | ||||
| Average Annual Return, Percent | 24.56% | ||||
| Bloomberg U.S. Aggregate Bond Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||||
| CP High Yield Trend Index | |||||
| Average Annual Return [Line Items] | |||||
| Line Graph and Table Measure Name | CP High Yield Trend Index | ||||
| Average Annual Return, Percent | 14.18% | 1.89% |
| Shareholder Report, Holdings (Details) | Sep. 30, 2024 |
| C000246525 | 527064109 | Leslie's, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.20% |
| C000246525 | 00857U107 | agilon health, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000246525 | M9T951109 | ZIM Integrated Shipping Services Ltd. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.10% |
| C000246525 | 42806J700 | Hertz Global Holdings, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | G87110105 | TechnipFMC PLC | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | 532457108 | Eli Lilly & Company | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | 12621E103 | CNO Financial Group, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | 141788109 | Cargurus, Inc. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | 104674106 | Brady Corporation, Class A | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | 88033G407 | Tenet Healthcare Corporation | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2% |
| C000246525 | Collateral for Securities Loaned | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 1.10% |
| C000246525 | Materials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 4% |
| C000246525 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 5.90% |
| C000246525 | Industrials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10% |
| C000246525 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 10.10% |
| C000246525 | Communications | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| C000246525 | Energy | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 11.90% |
| C000246525 | Financials | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 12% |
| C000246525 | Health Care | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.10% |
| C000246525 | Technology | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 20% |
| C000246525 | InvestmentType_Common Stocks | |
| Holdings [Line Items] | |
| Percent of Total Investments | 98.90% |
| C000246525 | InvestmentType_Money Market Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000216396 | United States Treasury Bill, 4.650, 2024-11-26 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 31.50% |
| C000216396 | United States Treasury Bill, 4.965, 2024-10-15 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.10% |
| C000216396 | United States Treasury Bill, 4.750, 2024-11-14 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 18.70% |
| C000216396 | United States Treasury Bill, 5.170, 2024-10-01 | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 14.40% |
| C000216396 | iShares Broad USD High Yield Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| C000216396 | iShares iBoxx High Yield Corporate Bond ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000216396 | SPDR Bloomberg High Yield Bond ETF | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000216396 | CP High Yield Trend PR Index Total Return Swap | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 0.90% |
| C000216396 | 31607A703Collateral for Securities Loaned | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 2.40% |
| C000216396 | 46435U853Fixed Income | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 8% |
| C000216396 | 912797LK1U.S. Treasury Obligations | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 90.80% |
| C000216396 | InvestmentType_Money Market Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000216396 | InvestmentType_Exchange-Traded Funds | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000216396 | InvestmentType_U.S. Government & Agencies | |
| Holdings [Line Items] | |
| Percent of Total Investments | 89.70% |
