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Risk Return Abstract rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName THE HARTFORD MUTUAL FUNDS II, INC.
Prospectus Date rr_ProspectusDate Feb. 28, 2025
The Hartford Small Cap Growth Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading <span style="color:#000000;font-family:Arial Narrow;font-size:20pt;font-weight:bold;">The Hartford Small Cap Growth Fund Summary Section</span>
Objective [Heading] rr_ObjectiveHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">INVESTMENT OBJECTIVE. </span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks long-term capital appreciation.
Expense [Heading] rr_ExpenseHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">YOUR EXPENSES. </span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock The table below 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 table and example below. Please contact your financial intermediary for more information regarding whether you may be required to pay a brokerage commission or other fees. You may qualify for sales charge discounts for Class A shares if you and your family invest, or agree to invest in the future, at least $50,000in certain classes of Hartford mutual funds or in The Hartford® SMART529® College Savings Plan. More information about these and other discounts is available from your financial professional and in the “How Sales Charges Are Calculated” section beginning on page 99 of the Fund’s statutory prospectus. Descriptions of any financial intermediary specific sales charge waivers and discounts are set forth in Appendix A to the statutory prospectus.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">Shareholder Fees</span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;"> (fees paid directly from your investment):</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">Annual Fund Operating Expenses</span><span style="color:#000000;font-family:Arial Narrow;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="color:#000000;font-family:Arial Narrow;font-size:9.5pt;">February 28, 2026</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;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 fiscal year ended October 31, 2024, the Fund’s portfolio turnover rate was 68% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 68.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock Investments of $1 million or more will not be subject to a front-end sales charge, but may be subject to a 1.00% contingent deferred sales charge.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">You may qualify for </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">sales charge discounts for Class A shares if you and your family invest, or agree to invest in the future, at least </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">$50,000</span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">in certain classes of Hartford mutual funds or in The Hartford</span><span style="color:#000000;font-family:Arial;font-size:6.5pt;position:relative;top:-2.75pt;">®</span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;"> SMART529</span><span style="color:#000000;font-family:Arial;font-size:6.5pt;position:relative;top:-2.75pt;">®</span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;"> College Savings Plan.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">Example. </span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The example below is intended to help you 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, except as shown below, redeem all of your shares at the end of those periods. The example also assumes that:●Your investment has a 5% return each year ●The Fund’s operating expenses remain the same (except that the example reflects the fee waiver and/or expense reimbursement arrangement reflected in the table above for only the first year)●You reinvest all dividends and distributions.Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <span style="color:#000000;font-family:Arial;font-size:9pt;">If you did not redeem your shares:</span>
Strategy [Heading] rr_StrategyHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">PRINCIPAL INVESTMENT STRATEGY. </span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund seeks its investment objective by investing primarily in common stocks of small capitalization companies that the Fund’s sub-adviser, Wellington Management Company LLP (“Wellington Management”), believes have superior growth potential. Under normal circumstances, the Fund invests at least 80% of its assets in common stocks of small capitalization companies. Wellington Management uses fundamental research designed to identify issuers with improving quality metrics, business momentum and attractive relative valuations. The investment process is aided by a proprietary screening tool that helps to identify companies with these characteristics. Based on market or economic conditions, the Fund may, through its normal bottom-up stock selection process, focus in one or more sectors of the market. The Fund defines small capitalization companies as companies with market capitalizations within the collective range of the Russell 2000 and S&P SmallCap 600 Indices. As of December 31, 2024, this range was approximately $6.15 million to $14.72 billion. The market capitalization range of these indices changes over time.
Risk [Heading] rr_RiskHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">PRINCIPAL RISKS. </span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">PAST PERFORMANCE.</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The performance information indicates the risks of investing in the Fund. Keep in mind that past performance (before and after taxes) does not indicate future results. Updated performance information is available at hartfordfunds.com. The returns for the Fund in the bar chart and table:●Assume reinvestment of all dividends and distributions ●Reflect fee waivers and/or expense limitation arrangements, if any. Absent any applicable fee waivers and/or expense limitation arrangements, performance would have been lower.The bar chart:●Shows how the Fund’s total return has varied from year to year ●Returns do not include sales charges. If sales charges were reflected, returns would have been lower●Shows the returns of Class A shares. Returns for the Fund’s other classes differ only to the extent that the classes do not have the same expenses.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;"> The performance information indicates the risks of investing in the Fund. </span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">hartfordfunds.com</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">Keep in mind that past </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">performance (before and after taxes) does not indicate future results.</span>
Bar Chart [Heading] rr_BarChartHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">Total returns by calendar year (excludes sales charges)</span>
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock During the periods shown in the chart above:ReturnsQuarter EndedBest Quarter Return31.64%December 31, 2020Worst Quarter Return-26.76%March 31, 2020
Performance Table Heading rr_PerformanceTableHeading <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">Average Annual Total Returns. </span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">After-tax returns, which are calculated using </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes, are shown only for Class A shares and will vary for other classes.</span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">Actual after-tax returns, which depend on an investor’s particular tax situation, may differ from those shown and are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">After-tax returns, which are calculated using </span><span style="color:#000000;font-family:Arial Narrow;font-size:10pt;">the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes, are shown only for Class A shares and will vary for other classes.</span>
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The table below shows returns for the Fund over time compared to those of two indices. The Russell 2000 Growth Index serves as the Fund’s performance index because the Fund’s investment manager believes it is more representative of the Fund’s investment strategy. The Russell 3000 Index serves as the Fund’s regulatory index and provides a broad measure of market performance. After-tax returns, which are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes, are shown only for Class A shares and will vary for other classes.Actual after-tax returns, which depend on an investor’s particular tax situation, may differ from those shown and are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
Caption rr_AverageAnnualReturnCaption <span style="color:#000000;font-family:Arial Narrow;font-size:11pt;font-weight:bold;">Average annual total returns for periods ending December 31, 2024 (including sales charges)</span>
The Hartford Small Cap Growth Fund | Risk Lose Money [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock When you sell your shares they may be worth more or less than what you paid for them, which means that you could lose money as a result of your investment.
The Hartford Small Cap Growth Fund | Risk Not Insured Depository Institution [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
The Hartford Small Cap Growth Fund | Market Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Market Risk –  Market risk is 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. Securities of a company may decline in value due to its financial prospects and activities, including certain operational impacts, such as data breaches and cybersecurity attacks. Securities may also decline in value due to general market and economic movements and trends, including adverse changes to credit markets, or as a result of other events such as geopolitical events, natural disasters, or widespread pandemics (such as COVID-19) or other adverse public health developments.
The Hartford Small Cap Growth Fund | Equity Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Equity Risk –  The risk that the price of equity or equity related securities may decline due to changes in a company’s financial condition and overall market and economic conditions.
The Hartford Small Cap Growth Fund | Small Cap Securities Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Small Cap Securities Risk –  Investments in small capitalization companies involve greater risks than investments in larger, more established companies. Many of these companies are young and have limited operating or business history. These securities may be subject to more abrupt or erratic price movements and may lack sufficient market liquidity, and these issuers often face greater business risks, including the risk of bankruptcy.
The Hartford Small Cap Growth Fund | Growth Investing Style Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Growth Investing Style Risk –  If the sub-adviser incorrectly assesses a company’s prospects for growth or how other investors will value the company’s growth, then the price of the company’s stock may decrease, or may not increase to the level anticipated by the sub-adviser. In addition, growth stocks may be more volatile than other stocks because they are more sensitive to investors’ perceptions of the issuing company’s growth potential. Also, the growth investing style may over time go in and out of favor. At times when the investing style used by the Fund is out of favor, the Fund may underperform other equity funds that use different investing styles.
The Hartford Small Cap Growth Fund | Active Investment Management Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Active Investment Management Risk –  The risk that, if the sub-adviser’s investment strategy does not perform as expected, the Fund could underperform its peers or lose money. Although the sub-adviser considers several factors when making investment decisions, the sub-adviser may not evaluate every factor prior to investing in a company or issuer, and the sub-adviser may determine that certain factors are more significant than others.
The Hartford Small Cap Growth Fund | Volatility Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Volatility Risk –  The Fund’s investments may fluctuate in value over a short period of time. This may cause the Fund’s net asset value per share to experience significant changes in value over short periods of time.
The Hartford Small Cap Growth Fund | Sector Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Sector Risk –  To the extent the Fund invests more heavily in a particular sector or sectors, its performance will be especially sensitive to developments that significantly affect those sectors. Individual sectors may be more volatile, and may perform differently, from the broader market.
The Hartford Small Cap Growth Fund | Large Shareholder Transaction Risk [Member]  
Risk Return Abstract rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock Large Shareholder Transaction Risk –  The Fund may experience adverse effects when certain large shareholders redeem or purchase large amounts of shares of the Fund. Such redemptions may cause the Fund to sell securities at times when it would not otherwise do so or borrow money (at a cost to the Fund), which may negatively impact the Fund’s performance and liquidity. Similarly, large purchases may adversely affect the Fund’s performance to the extent that the Fund is delayed in investing new cash and is required to maintain a larger cash position than it ordinarily would. These transactions may also accelerate the realization of taxable income to shareholders if such sales of investments resulted in gains, and may also increase transaction costs.
The Hartford Small Cap Growth Fund | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.50%
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none [1]
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.29% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.33%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.33% [3]
Year 1 rr_ExpenseExampleYear01 $ 678
Year 3 rr_ExpenseExampleYear03 948
Year 5 rr_ExpenseExampleYear05 1,239
Year 10 rr_ExpenseExampleYear10 $ 2,063
2015 rr_AnnualReturn2015 (1.30%)
2016 rr_AnnualReturn2016 11.68%
2017 rr_AnnualReturn2017 19.61%
2018 rr_AnnualReturn2018 (12.41%)
2019 rr_AnnualReturn2019 35.29%
2020 rr_AnnualReturn2020 31.75%
2021 rr_AnnualReturn2021 3.31%
2022 rr_AnnualReturn2022 (29.10%)
2023 rr_AnnualReturn2023 17.70%
2024 rr_AnnualReturn2024 12.22%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Best Quarter Return</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 31.64%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="color:#000000;font-family:Arial;font-size:9pt;font-weight:bold;margin-left:0.0pt;">Worst Quarter Return</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (26.76%)
The Hartford Small Cap Growth Fund | Class C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.31% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 2.10%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 2.10% [3]
Year 1 rr_ExpenseExampleYear01 $ 313
Year 3 rr_ExpenseExampleYear03 658
Year 5 rr_ExpenseExampleYear05 1,129
Year 10 rr_ExpenseExampleYear10 2,431
Year 1 rr_ExpenseExampleNoRedemptionYear01 213
Year 3 rr_ExpenseExampleNoRedemptionYear03 658
Year 5 rr_ExpenseExampleNoRedemptionYear05 1,129
Year 10 rr_ExpenseExampleNoRedemptionYear10 $ 2,431
The Hartford Small Cap Growth Fund | Class I  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.17% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.96%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.96% [3]
Year 1 rr_ExpenseExampleYear01 $ 98
Year 3 rr_ExpenseExampleYear03 306
Year 5 rr_ExpenseExampleYear05 531
Year 10 rr_ExpenseExampleYear10 $ 1,178
The Hartford Small Cap Growth Fund | Class R3  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other expenses rr_OtherExpensesOverAssets 0.29% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.58%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.58% [3]
Year 1 rr_ExpenseExampleYear01 $ 161
Year 3 rr_ExpenseExampleYear03 499
Year 5 rr_ExpenseExampleYear05 860
Year 10 rr_ExpenseExampleYear10 $ 1,878
The Hartford Small Cap Growth Fund | Class R4  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.23% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 1.27%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 1.27% [3]
Year 1 rr_ExpenseExampleYear01 $ 129
Year 3 rr_ExpenseExampleYear03 403
Year 5 rr_ExpenseExampleYear05 697
Year 10 rr_ExpenseExampleYear10 $ 1,534
The Hartford Small Cap Growth Fund | Class R5  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.97%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.97% [3]
Year 1 rr_ExpenseExampleYear01 $ 99
Year 3 rr_ExpenseExampleYear03 309
Year 5 rr_ExpenseExampleYear05 536
Year 10 rr_ExpenseExampleYear10 $ 1,190
The Hartford Small Cap Growth Fund | Class R6  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.08% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.87%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.87% [3]
Year 1 rr_ExpenseExampleYear01 $ 89
Year 3 rr_ExpenseExampleYear03 278
Year 5 rr_ExpenseExampleYear05 482
Year 10 rr_ExpenseExampleYear10 $ 1,073
The Hartford Small Cap Growth Fund | Class Y  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.18% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.97%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets 0.04% [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.93% [3]
Year 1 rr_ExpenseExampleYear01 $ 95
Year 3 rr_ExpenseExampleYear03 305
Year 5 rr_ExpenseExampleYear05 532
Year 10 rr_ExpenseExampleYear10 $ 1,186
The Hartford Small Cap Growth Fund | Class F  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum sales charge (load) imposed on purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum deferred sales charge (load) (as a percentage of purchase price or redemption proceeds, whichever is less) rr_MaximumDeferredSalesChargeOverOther none
Management fees rr_ManagementFeesOverAssets 0.79%
Distribution and service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.07% [2]
Total annual fund operating expenses rr_ExpensesOverAssets 0.86%
Fee waiver and/or expense reimbursement rr_FeeWaiverOrReimbursementOverAssets none [3]
Total annual fund operating expenses after fee waiver and/or expense reimbursement rr_NetExpensesOverAssets 0.86% [3]
Year 1 rr_ExpenseExampleYear01 $ 88
Year 3 rr_ExpenseExampleYear03 274
Year 5 rr_ExpenseExampleYear05 477
Year 10 rr_ExpenseExampleYear10 $ 1,061
The Hartford Small Cap Growth Fund | After Taxes on Distributions | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.50%
5 Years rr_AverageAnnualReturnYear05 1.55%
10 Years rr_AverageAnnualReturnYear10 4.26%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.04%
5 Years rr_AverageAnnualReturnYear05 3.79%
10 Years rr_AverageAnnualReturnYear10 6.53%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class C  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 10.37%
5 Years rr_AverageAnnualReturnYear05 4.20%
10 Years rr_AverageAnnualReturnYear10 6.37%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class I  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.63%
5 Years rr_AverageAnnualReturnYear05 5.35%
10 Years rr_AverageAnnualReturnYear10 7.49%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class R3  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 11.95%
5 Years rr_AverageAnnualReturnYear05 4.70%
10 Years rr_AverageAnnualReturnYear10 6.85%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class R4  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.28%
5 Years rr_AverageAnnualReturnYear05 5.01%
10 Years rr_AverageAnnualReturnYear10 7.17%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class R5  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.63%
5 Years rr_AverageAnnualReturnYear05 5.34%
10 Years rr_AverageAnnualReturnYear10 7.51%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class R6  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.73%
5 Years rr_AverageAnnualReturnYear05 5.44%
10 Years rr_AverageAnnualReturnYear10 7.60%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class Y  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.66%
5 Years rr_AverageAnnualReturnYear05 5.38%
10 Years rr_AverageAnnualReturnYear10 7.57%
The Hartford Small Cap Growth Fund | Return Before Taxes | Class F  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 12.73% [4]
5 Years rr_AverageAnnualReturnYear05 5.45% [4]
10 Years rr_AverageAnnualReturnYear10 7.57% [4]
The Hartford Small Cap Growth Fund | After Taxes on Distributions and Sale of Fund Shares | Class A  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 6.13%
5 Years rr_AverageAnnualReturnYear05 2.94%
10 Years rr_AverageAnnualReturnYear10 4.82%
The Hartford Small Cap Growth Fund | Russell 3000 Index (reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 23.81%
5 Years rr_AverageAnnualReturnYear05 13.86%
10 Years rr_AverageAnnualReturnYear10 12.55%
The Hartford Small Cap Growth Fund | Russell 2000 Growth Index (reflects no deduction for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.15%
5 Years rr_AverageAnnualReturnYear05 6.86%
10 Years rr_AverageAnnualReturnYear10 8.09%
[1] Investments of $1 million or more will not be subject to a front-end sales charge, but may be subject to a 1.00% contingent deferred sales charge.
[2] “Other expenses” for Class C exclude the expenses associated with the reverse stock split. If these expenses were included, “Other expenses” for Class C would have been as follows: 0.34% (Class C).
[3] Hartford Administrative Services Company (“HASCO”), the Fund’s transfer agent, has contractually agreed to waive its transfer agency fee and/or reimburse transfer agency-related expenses to the extent necessary to limit the transfer agency fee for Class Y as follows: 0.074%. This contractual arrangement will remain in effect until February 28, 2026 unless the Board of Directors of The Hartford Mutual Funds II, Inc. approves its earlier termination.
[4] Class F shares commenced operations on February 28, 2017 and performance prior to that date is that of the Fund’s Class I shares. Performance prior to an inception date of a class has not been adjusted to reflect the operating expenses of such class.