Label	Element	Value
Risk Return Abstract	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	NATIONWIDE MUTUAL FUNDS
Prospectus Date	rr_ProspectusDate	Feb. 28, 2025
Nationwide Janus Henderson Overseas Fund
Risk Return Abstract	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Fund Summary: Nationwide Janus Henderson Overseas Fund
Objective [Heading]	rr_ObjectiveHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Objective</span>
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The Nationwide Janus Henderson Overseas Fund seeks long-term capital appreciation.
Expense [Heading]	rr_ExpenseHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Fees and Expenses</span>
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in the Fund. More information about these and other discounts is available from your financial professional and in “Investing with Nationwide Funds” commencing on page 56 of this Prospectus and in “Additional Information on Purchases and Sales” commencing on page 96 of the Statement of Additional Information. In addition, if you purchase shares through a specific intermediary, you may be subject to different sales charges including reductions in or waivers of such charges. More information about these intermediary-specific sales charge variations is available in Appendix A to the Fund’s Prospectus.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Shareholder Fees </span><span style="color:#000000;font-family:Arial;font-size:10pt;">(fees paid directly from your investment)</span>
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;">Annual Fund Operating Expenses </span><span style="color:#000000;font-family:Arial;font-size:10pt;">(expenses that you pay each year as a percentage of the value of your investment)</span>
Fee Waiver or Reimbursement over Assets, Date of Termination	rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination	<span style="font-family:Arial;font-size:8pt;">February 28, 2026</span>
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Portfolio Turnover</span>
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 43.00% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	43.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	<span style="color:#000000;font-family:Arial;font-size:10pt;">You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at </span><span style="color:#000000;font-family:Arial;font-size:10pt;">least </span><span style="color:#000000;font-family:Arial;font-size:10pt;">$50,000 </span><span style="color:#000000;font-family:Arial;font-size:10pt;">in the Fund. </span>
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expense Example [Heading]	rr_ExpenseExampleHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Example</span>
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	This Example is intended to help you to compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then sell all of your shares at the end of those time periods. It assumes a 5% return each year and no change in expenses, and any expense limitation or fee waivers that may apply for the periods indicated above under “Fees and Expenses.” Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Principal Investment Strategies</span>
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	The Fund seeks to provide investors with long-term capital appreciation by creating a diversified portfolio of non-U.S. equity securities. The Fund normally invests in securities of issuers from several different countries, excluding the United States. Although the Fund typically invests 80% or more of its assets in issuers that are economically tied to countries outside the United States, it also may invest up to 20% of its net assets, measured at the time of purchase, in U.S. issuers, and it may, under unusual circumstances, invest all or substantially all of its assets in a single country. The subadviser considers an issuer to be economically tied to a country or countries outside of the United States if the issuer is organized in, or its primary business office or principal trading market of its equity is located in, a country outside of the United States; a majority of the issuer’s revenues are derived from outside of the United States; or a majority of the issuer’s assets are located outside of the United States. The Fund may invest in issuers located in emerging market countries, and the Fund may invest in issuers of any size or market capitalization, including smaller capitalization companies. Emerging market countries typically are developing and low- or middle-income countries. Emerging market countries may be found in regions such as Asia, Latin America, Eastern Europe, the Middle East and Africa. The Fund may achieve its exposure to non-U.S. securities either directly, including through investments in securities listed outside the United States or in U.S.-listed securities of non-U.S. issuers, or through depositary receipts, such as American Depositary Receipts (ADRs). The Fund also may invest in Chinese companies listed on U.S. exchanges structured as variable interest entities. Many foreign securities are denominated in currencies other than the U.S. dollar. The Fund may invest in securities of companies in the real estate industry or real estate-related industries, including securities of real estate investment trusts (“REITs”). The Fund’s subadviser employs a bottom-up approach in choosing investments, meaning that it looks at companies one at a time to determine if a company is an attractive investment opportunity and if it is consistent with the Fund’s investment policies. In particular, the subadviser seeks to invest in companies in which it believes the market underestimates free cash-flow growth. The Fund’s portfolio includes stocks that are considered to be either growth stocks or value stocks. Because the subadviser’s process is driven primarily by individual stock selection, the portfolio’s investment characteristics may vary over time and, at any given time, the Fund may emphasize either growth stocks or value stocks. The subadviser generally considers selling a security when, among other things, the security no longer reflects the subadviser’s investment thesis, the security approaches or exceeds its targeted value, there has been a change in a security’s risk/reward potential, or a better idea is identified. The Fund may engage in active and frequent trading of portfolio securities.
Risk [Heading]	rr_RiskHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Principal Risks</span>
Risk [Text Block]	rr_RiskTextBlock	The Fund cannot guarantee that it will achieve its investment objective. As with any fund, the value of the Fund’s investments—and therefore, the value of Fund shares—may fluctuate. These changes may occur because of:Loss of money is a risk of investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	<span style="color:#000000;font-family:Arial;font-size:12pt;font-weight:bold;">Performance</span>
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The Fund has adopted the historical performance of the AllianzGI International Growth Fund, a former series of Allianz Funds Multi-Strategy Trust (the “Predecessor Fund”) as the result of a reorganization in which the Fund acquired all of the assets, subject to liabilities, of the Predecessor Fund on June 3, 2019. The returns presented for periods prior to June 3, 2019 reflect the performance of the Predecessor Fund. At the time of the reorganization, the Fund and the Predecessor Fund had substantially similar investment goals and strategies. The following bar chart and table can help you evaluate the Fund’s potential risks. The bar chart shows how the Fund’s annual total returns have varied from year to year. These returns do not reflect the impact of sales charges. If sales charges were included, the annual total returns would be lower than those shown. The table compares the Fund’s average annual total returns to the returns of a broad-based securities market index. Remember, however, that past performance (before and after taxes) is not necessarily indicative of how the Fund will perform in the future.Updated performance information is available at no cost by visiting nationwide.com/mutualfunds or by calling 800-848-0920. The Fund's performance prior to July 18, 2022 reflects returns pursuant to different investment strategies and a different subadviser. If the Fund's current strategies and subadviser had been in place for the prior period, the performance information shown would have been different.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	<span style="font-family:Arial;font-size:10pt;">The bar chart shows how the Fund’s </span><span style="font-family:Arial;font-size:10pt;">annual total returns have varied from year to year. </span><span style="font-family:Arial;font-size:10pt;">These </span><span style="font-family:Arial;font-size:10pt;">returns do not reflect the impact of sales charges. If sales charges were included, the annual total returns would be lower than those shown.</span><span style="font-family:Arial;font-size:10pt;"> The table compares the Fund’s </span><span style="font-family:Arial;font-size:10pt;">average annual total returns to the returns of a broad-based securities market index</span>
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	<span style="font-family:Arial;font-size:10pt;">800-848-0920</span>
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	<span style="font-family:Arial;font-size:10pt;">nationwide.com/mutualfunds</span>
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	<span style="font-family:Arial;font-size:10pt;">Remember, however, that past performance (before and after taxes) is not necessarily indicative of how the Fund will perform in the future.</span>
Bar Chart [Heading]	rr_BarChartHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Annual Total Returns</span><span style="font-family:Arial;font-size:10pt;font-weight:bold;margin-left:2.5pt;">– Class A Shares</span><br/><span style="font-family:Arial;font-size:10pt;font-weight:bold;">(Years Ended December 31,)</span>
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	<span style="font-family:Arial;font-size:10pt;">These </span><span style="font-family:Arial;font-size:10pt;">returns do not reflect the impact of sales charges. If sales charges were included, the annual total returns would be lower than those shown.</span>
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Highest Quarter:38.71%–2Q 2020Lowest Quarter:-22.59%–2Q 2022
Performance Table Heading	rr_PerformanceTableHeading	<span style="font-family:Arial;font-size:10pt;font-weight:bold;">Average Annual Total Returns</span> <br/><span style="font-family:Arial;font-size:10pt;font-weight:bold;">(For the Periods Ended December 31, 2024)</span>
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns are calculated using </span><span style="color:#000000;font-family:Arial;font-size:10pt;">the historical highest individual federal marginal income tax rates and do not reflect state and local taxes.</span>
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns are </span><span style="color:#000000;font-family:Arial;font-size:10pt;">not relevant to investors in tax-advantaged arrangements, such as individual retirement accounts, 401(k) plans or certain other employer-sponsored retirement plans.</span>
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	<span style="color:#000000;font-family:Arial;font-size:10pt;">After-tax returns are shown for Class A shares only and will vary for other classes. </span>
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are shown for Class A shares only and will vary for other classes. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect state and local taxes. Your actual after-tax return depends on your personal tax situation and may differ from what is shown here. After-tax returns are not relevant to investors in tax-advantaged arrangements, such as individual retirement accounts, 401(k) plans or certain other employer-sponsored retirement plans.Historical performance for Class A and Class R6 shares is based on the previous performance of Class A and Institutional Class shares, respectively, of the Predecessor Fund. The inception date for Institutional Service Class and Eagle Class shares is June 3, 2019. Therefore, pre-inception historical performance for both Institutional Service Class and Eagle Class shares is based on the previous performance of Institutional Class shares of the Predecessor Fund. Performance for Institutional Service Class and Eagle Class shares has been adjusted to reflect the higher expenses of Institutional Service Class and Eagle Class shares than those of the Predecessor Fund’s Institutional Class shares.
Nationwide Janus Henderson Overseas Fund | Risk Lose Money [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Loss of money is a risk of investing in the Fund.
Nationwide Janus Henderson Overseas Fund | Equity Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Equity securities risk – stock markets are volatile. The price of an equity security fluctuates based on changes in a company’s financial condition and overall market and economic conditions.
Nationwide Janus Henderson Overseas Fund | Market Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Market risk – the risk that one or more markets in which the Fund invests will go down in value, including the possibility that the markets will go down sharply and unpredictably. This occurs due to numerous factors, including interest rates, the outlook for corporate profits, the health of the national and world economies, and the fluctuation of other securities markets around the world. These risks may be magnified if certain social, political, economic and other conditions and events (such as natural disasters, epidemics and pandemics, terrorism, conflicts and social unrest or rapid technological developments such as artificial intelligence) adversely interrupt the global economy.
Nationwide Janus Henderson Overseas Fund | Foreign Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Foreign securities risk – foreign securities often are more volatile, harder to price and less liquid than U.S. securities. The prices of foreign securities may be further affected by other factors, such as changes in the exchange rates between the U.S. dollar and the currencies in which the securities are traded.
Nationwide Janus Henderson Overseas Fund | Foreign Currencies [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Foreign currencies – foreign securities may be denominated or quoted in currencies other than the U.S. dollar. Changes in foreign currency exchange rates affect the value of the Fund’s portfolio. Generally, when the U.S. dollar rises in value against a foreign currency, a security denominated in that currency loses value because the currency is worth fewer U.S. dollars. Conversely, when the U.S. dollar decreases in value against a foreign currency, a security denominated in that currency gains value because the currency is worth more U.S. dollars.
Nationwide Janus Henderson Overseas Fund | Emerging Markets Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Emerging markets risk – emerging markets are riskier than more developed markets because they tend to develop unevenly and may never fully develop. Investments in emerging markets are considered speculative. Emerging markets are more likely to experience hyperinflation and currency devaluations, which adversely affect returns to U.S. investors. In addition, many emerging securities markets have far lower trading volumes and less liquidity than developed markets. Since these markets are smaller than developed markets, they may be more likely to suffer sharp and frequent price changes or long-term price depression because of adverse publicity, investor perceptions or the actions of a few large investors. Practices in relation to settlement of securities transactions in emerging markets involve higher risks than those in developed markets, in part because the Fund will need to use brokers and counterparties that are less well capitalized, and custody and registration of assets in some countries are unreliable compared to developed markets. Companies in emerging market countries generally are subject to less stringent financial reporting, accounting and auditing standards than companies in more developed countries. In addition, information about such companies may be less available and reliable. Many emerging markets also have histories of political instability and abrupt changes in policies, and the ability to bring and enforce actions may be limited. Certain emerging markets also face other significant internal or external risks, including the risk of war, nationalization of assets, unexpected market closures and ethnic, religious and racial conflicts.
Nationwide Janus Henderson Overseas Fund | China Exposure [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	China exposure – there are special risks associated with investments in China (including Chinese companies listed on U.S. and Hong Kong exchanges), Hong Kong and Taiwan, including exposure to expropriation, confiscatory taxation, nationalization, exchange control regulations (including currency blockage), and uncertainty regarding the ongoing trade dispute and imposition of tariffs between China and the United States. Inflation and rapid fluctuations in inflation and interest rates have had, and may continue to have, negative effects on the economy and securities markets of China, Hong Kong and Taiwan. In addition, investments in Taiwan and Hong Kong could be adversely affected by their respective political and economic relationship with China. Any difficulties encountered by the U.S. Public Company Accounting Oversight Board (“PCAOB”) in inspecting audit work papers and practices of PCAOB registered accounting firms in China with respect to their audit work of U.S. reporting companies also imposes significant additional risks associated with investments in China. There may be significant obstacles to obtaining information necessary for investigations into or litigation against companies located in or operating in China and shareholders may have limited legal remedies. China, Hong Kong and Taiwan are deemed by the investment manager to be emerging markets countries, and thus are subject to the risks associated with and described under “emerging markets risk.”
Nationwide Janus Henderson Overseas Fund | Chinese Variable Interest Entities [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Chinese variable interest entities – there are special risks associated with investments in Chinese variable interest entities (“VIEs”). In a typical VIE structure, a shell company is set up in an offshore jurisdiction, such as the Cayman Islands. The shell company, through a wholly foreign-owned enterprise based in China, enters into service and other contracts with another Chinese company known as the VIE. The VIE must be owned by Chinese nationals (and/or other Chinese companies). While VIEs are a longstanding industry practice that is well known to Chinese officials and regulators historically, they have not been formally recognized under Chinese law. It is uncertain whether Chinese officials or regulators will withdraw their implicit acceptance of the VIE structure or limit a VIE’s ability to pass through economic and governance rights to foreign individuals and entities. Effective March 31, 2023, the China Securities Regulatory Commission (“CSRC”) released new rules that permit the use of VIE structures, provided they abide by Chinese laws and register with the CSRC. The rules, however, may cause Chinese companies to undergo greater scrutiny and may make the process to create VIEs more difficult and costly. Guidance prohibiting these structures by the Chinese government, generally or with respect to specific industries, would likely cause impacted VIE-structured holding(s) to suffer significant, detrimental, and possibly permanent losses, and in turn, adversely affect the Fund’s returns and net asset value. Further, if a Chinese court or arbitration body chose not to enforce the contracts, the value of the shell company would significantly decline, since it derives its value from the ability to consolidate the VIE into its financials pursuant to such contracts, and in turn, adversely affect the Fund’s returns and net asset value.
Nationwide Janus Henderson Overseas Fund | Selection Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Selection risk – the risk that the securities selected by the Fund’s subadviser will underperform the markets, the relevant indexes or the securities selected by other funds with similar investment objectives and investment strategies.
Nationwide Janus Henderson Overseas Fund | Smaller Company Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Smaller company risk – smaller companies are usually less stable in price and less liquid than larger, more established companies. Smaller companies are more vulnerable than larger companies to adverse business and economic developments and may have more limited resources. Therefore, they generally involve greater risk.
Nationwide Janus Henderson Overseas Fund | Growth Style Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Growth style risk – growth stocks are generally more sensitive to market movements than other types of stocks primarily because their stock prices are based heavily on future expectations. If the subadviser’s assessment of the prospects for a company’s growth is wrong, or if the subadviser’s judgment of how other investors will value the company’s growth is wrong, then the Fund will suffer a loss as the price of the company’s stock may fall or not approach the value that the subadviser has placed on it. In addition, growth stocks as a group sometimes are out of favor and underperform the overall equity market for long periods while the market concentrates on other types of stocks, such as “value” stocks.
Nationwide Janus Henderson Overseas Fund | Value Style Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Value style risk – value investing carries the risk that the market will not recognize a security’s intrinsic value for a long time or that a stock judged to be undervalued actually is appropriately priced. In addition, value stocks as a group sometimes are out of favor and underperform the overall equity market for long periods while the market concentrates on other types of stocks, such as “growth” stocks.
Nationwide Janus Henderson Overseas Fund | Country or Sector Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Country or sector risk – if the Fund emphasizes one or more countries or economic sectors, it will be more susceptible to the financial, market or economic events affecting the particular issuers in which it invests than funds that do not emphasize particular countries or sectors.
Nationwide Janus Henderson Overseas Fund | Limited Portfolio Holdings Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Limited portfolio holdings risk – because the Fund may hold large positions in a smaller number of securities, an increase or decrease in the value of such securities will have a greater impact on the Fund’s value and total return. Funds that invest in a relatively small number of securities often are subject to greater volatility than a more diversified investment.
Nationwide Janus Henderson Overseas Fund | Liquidity Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Liquidity risk – when there is little or no active trading market for specific types of securities or instruments, it can become more difficult to sell the securities or instruments at or near their perceived value. An inability to sell a portfolio position can adversely affect the Fund's value or prevent the Fund from being able to take advantage of other investment opportunities. Liquidity risk also includes the risk that the Fund will experience significant net redemptions of its shares at a time when it cannot find willing buyers for its portfolio securities or instruments or can sell its portfolio securities or instruments only at a material loss. To meet redemption requests, the Fund may be forced to sell other securities or instruments that are more liquid, but at unfavorable times and conditions. Investments in foreign securities tend to have more exposure to liquidity risk than domestic securities.
Nationwide Janus Henderson Overseas Fund | Portfolio Turnover Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	Portfolio turnover risk – a higher portfolio turnover rate increases transaction costs, may adversely impact the Fund’s performance, and may result in higher taxes when Fund shares are held in a taxable account.
Nationwide Janus Henderson Overseas Fund | REIT and Real Estate Securities Risk [Member]
Risk Return Abstract	rr_RiskReturnAbstract
Risk [Text Block]	rr_RiskTextBlock	REIT and real estate securities risk – involves the risks that are associated with investing in real estate, including (1) possible declines in the value of real estate; (2) adverse general and local economic conditions; (3) possible lack of availability of mortgage funds; (4) changes in interest rates; (5) unexpected vacancies of properties; (6) environmental problems; and (7) the relative lack of liquidity associated with investments in real estate. In addition, REITs are subject to other risks related specifically to their structure and focus: (a) dependency on management skills; (b) limited diversification; (c) the risks of locating and managing financing for projects; (d) heavy cash flow dependency; (e) possible default by borrowers; (f) the costs and potential losses of self-liquidation of one or more holdings; (g) the possibility of failing to maintain exemptions from securities registration; (h) the possibility of failing to qualify for special tax treatment; (i) duplicative fees; and (j) in many cases, relatively small market capitalization, which may result in less market liquidity and greater price volatility. REITs whose underlying properties are concentrated in a particular industry or geographic region also are subject to risks affecting such industries and regions.
Nationwide Janus Henderson Overseas Fund | Class A Shares
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	0.57%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.52%
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.44%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	1.08%
1 Year	rr_ExpenseExampleYear01	$ 679
3 Years	rr_ExpenseExampleYear03	987
5 Years	rr_ExpenseExampleYear05	1,317
10 Years	rr_ExpenseExampleYear10	$ 2,248
2016	rr_AnnualReturn2016	(0.20%)
2017	rr_AnnualReturn2017	38.70%
2018	rr_AnnualReturn2018	(14.47%)
2019	rr_AnnualReturn2019	30.78%
2020	rr_AnnualReturn2020	51.62%
2021	rr_AnnualReturn2021	(1.95%)
Annual Return 2022	rr_AnnualReturn2022	(32.97%)
Annual Return 2023	rr_AnnualReturn2023	10.49%
Annual Return 2024	rr_AnnualReturn2024	5.54%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Highest Quarter:</span>
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2020
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	38.71%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	<span style="color:#000000;font-family:Arial;font-size:10pt;font-weight:bold;margin-left:0.0pt;">Lowest Quarter:</span>
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Jun. 30, 2022
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(22.59%)
1 Year	rr_AverageAnnualReturnYear01	(0.51%)
5 Years	rr_AverageAnnualReturnYear05	1.84%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	5.58%
Fund Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 02, 2015
Nationwide Janus Henderson Overseas Fund | Class R6 Shares
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.46%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.16%
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.44%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	0.72%
1 Year	rr_ExpenseExampleYear01	$ 74
3 Years	rr_ExpenseExampleYear03	325
5 Years	rr_ExpenseExampleYear05	596
10 Years	rr_ExpenseExampleYear10	$ 1,370
1 Year	rr_AverageAnnualReturnYear01	5.91%
5 Years	rr_AverageAnnualReturnYear05	3.43%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	6.52%
Fund Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 02, 2015
Nationwide Janus Henderson Overseas Fund | Institutional Service Class Shares
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.65%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.35%
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.44%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	0.91%
1 Year	rr_ExpenseExampleYear01	$ 93
3 Years	rr_ExpenseExampleYear03	384
5 Years	rr_ExpenseExampleYear05	697
10 Years	rr_ExpenseExampleYear10	$ 1,586
1 Year	rr_AverageAnnualReturnYear01	5.70%
5 Years	rr_AverageAnnualReturnYear05	3.20%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	6.26%
Fund Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 02, 2015
Nationwide Janus Henderson Overseas Fund | Eagle Class Shares
Risk Return Abstract	rr_RiskReturnAbstract
Maximum Sales Charge (Load) imposed on purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Management Fees	rr_ManagementFeesOverAssets	0.70%
Distribution and/or Service (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	0.56%
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	1.26%
Fee Waiver/Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(0.44%)	[1]
Total Annual Fund Operating Expenses After Fee Waiver/Expense Reimbursement	rr_NetExpensesOverAssets	0.82%
1 Year	rr_ExpenseExampleYear01	$ 184
3 Years	rr_ExpenseExampleYear03	356
5 Years	rr_ExpenseExampleYear05	649
10 Years	rr_ExpenseExampleYear10	$ 1,484
1 Year	rr_AverageAnnualReturnYear01	5.92%
5 Years	rr_AverageAnnualReturnYear05	3.41%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	6.45%
Fund Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 02, 2015
Nationwide Janus Henderson Overseas Fund | After Taxes on Distributions | Class A Shares
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	(0.78%)
5 Years	rr_AverageAnnualReturnYear05	1.07%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	4.43%
Fund Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 02, 2015
Nationwide Janus Henderson Overseas Fund | After Taxes on Distributions and Sales of Shares | Class A Shares
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	0.06%
5 Years	rr_AverageAnnualReturnYear05	1.48%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	4.10%
Fund Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 02, 2015
Nationwide Janus Henderson Overseas Fund | MSCI ACWI ex USA Index (The Index does not pay sales charges, fees, expenses or taxes.)
Risk Return Abstract	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	5.53%
5 Years	rr_AverageAnnualReturnYear05	4.10%
Since Fund Inception	rr_AverageAnnualReturnSinceInception	4.86%

[1] Nationwide Mutual Funds (the “Trust”) and Nationwide Fund Advisors (the “Adviser”) have entered into a written contract limiting annual fund operating expenses to 0.72% until at least February 28, 2026. Under the expense limitation agreement, the level to which operating expenses are limited applies to all share classes, excluding any taxes, interest, compensation payable to parties not affiliated with the Adviser for the recovery of tax reclaims, brokerage commissions, Rule 12b-1 fees, acquired fund fees and expenses, short-sale dividend expenses, administrative services fees, other expenses which are capitalized in accordance with generally accepted accounting principles and expenses incurred by the Fund in connection with any merger or reorganization, and may exclude other nonroutine expenses not incurred in the ordinary course of the Fund’s business. The expense limitation agreement may be changed or eliminated only with the consent of the Board of Trustees of the Trust. The Adviser may request and receive reimbursement from the Fund for advisory fees waived or other expenses reimbursed by the Adviser pursuant to the expense limitation agreement at a date not to exceed three years from the date in which the corresponding waiver or reimbursement to the Fund was made. However, no reimbursement may be made unless: (i) the Fund’s assets exceed $100 million and (ii) the total annual expense ratio of the class making such reimbursement is no higher than the amount of the expense limitation that was in place at the time the Adviser waived the fees or reimbursed the expenses and does not cause the expense ratio to exceed the current expense limitation. Reimbursement by the Fund of amounts previously waived or reimbursed by the Adviser is not permitted except as provided for in the expense limitation agreement.