Label | Element | Value | ||
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Class I | NICHOLAS II INC | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
Risk/Return [Heading] | rr_RiskReturnHeading | SUMMARY | ||
Objective [Heading] | rr_ObjectiveHeading | Investment Objective | ||
Objective, Primary [Text Block] | rr_ObjectivePrimaryTextBlock | The Fund strives to increase the value of your investment over the long-term (“long-term growth”). | ||
Expense [Heading] | rr_ExpenseHeading | Fees and Expenses of the Fund | ||
Expense Narrative [Text Block] | rr_ExpenseNarrativeTextBlock | The table below describes the fees and expenses that you may pay if you buy and hold 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. | ||
Shareholder Fees Caption [Text] | rr_ShareholderFeesCaption | Shareholder Fees (fees paid directly from your investment) | ||
Operating Expenses Caption [Text] | rr_OperatingExpensesCaption | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | ||
Portfolio Turnover [Heading] | rr_PortfolioTurnoverHeading | Portfolio Turnover | ||
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 in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 15.76% of the average value of the portfolio. | ||
Portfolio Turnover, Rate | rr_PortfolioTurnoverRate | 15.76% | ||
Expense Example [Heading] | rr_ExpenseExampleHeading | Example: | ||
Expense Example Narrative [Text Block] | rr_ExpenseExampleNarrativeTextBlock | This example 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 inthe Fund for the time periods indicated and thenredeem all of your shares at the end of thoseperiods. The Example also assumes that yourinvestment has a 5% return each year and thatthe Fund’s operating expenses remain the same.Although your actual costs may be higher orlower, based on these assumptions, your costswould be: | ||
Strategy [Heading] | rr_StrategyHeading | Principal Investment Strategies | ||
Strategy Narrative [Text Block] | rr_StrategyNarrativeTextBlock | To pursue the Fund’s investment objective of long-term growth, it primarily invests in common stocks of domestic corporations with medium-sized market capitalizations believed to have growth potential. The Fund believes a company’s annual sales volume and the market capitalization (the number of shares outstanding multiplied by the per share price) are the factors most illustrative of a company’s size. In distinguishing company size in terms of sales volume, the Fund considers a company’s sales volume relative to peer companies in the company’s industry. In terms of market capitalization, the Fund generally considers companies with market capitalizations up to $3 billion as “small,” between $3 billion and $25 billion as “medium,” and greater than $25 billion as “large.” To a lesser extent, the Fund may invest in companies with small and large market capitalizations. The Fund looks for established companies with the potential for superior growth in sales and earnings in a diversified group of industries. The Fund’s investment philosophy is basically a long-term growth philosophy, based upon the assumption that if a company achieves superior growth in sales and earnings, eventually the company’s stock will achieve superior performance. It is anticipated that a major portion of the Fund’s portfolio will be invested in common stocks of the types of companies, and in the manner, as described above.
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Risk [Heading] | rr_RiskHeading | Principal Risks of Investing | ||
Risk Narrative [Text Block] | rr_RiskNarrativeTextBlock | As with any mutual fund, the Fund cannot guarantee that it will achieve its goals or that its performance will be positive over any period of time. The Fund’s investments change in value. Consequently, the value of your Fund shares may change. If the value of the Fund shares or the values of the Fund’s investments go down, you may lose money. The principal risks of investing in the Fund are: Market Risk – Market risk involves the possibility that the value of the Fund’s investments will fluctuate as the stock market fluctuates over short- or longer-term periods. Common stocks prices tend to be more volatile than other investments choices. Portfolio-Specific Risk – From time to time, the value of an individual company may decline due to a particular set of circumstances affecting that company, its industry or certain companies within the industry, while having little or no impact on other similar companies within the industry. Because the Fund will invest most of its assets in the securities of mid-cap companies and to a lesser extent, small-cap companies, the Fund may face additional risks. Small- to mid- cap companies often have a limited market for their securities and limited financial resources, and are usually more affected by changes in the economy. Securities of small to medium capitalization companies also often fluctuate in price more than common stocks of larger capitalization companies. Selection Risk – The Fund also faces selection risk, which is the risk that the stocks the Fund purchases will underperform markets or other mutual funds with similar investment objectives and strategies. Public Health Threats Risk – Threats to public health can have a negative impact on the global economy and financial markets, which could adversely affect the securities held by the Fund. Impacts of public health threats may last for an extended period of time and result in a substantial economic downturn. Health crises caused by outbreaks, such as the coronavirus (COVID-19) outbreak, may exacerbate other pre-existing political, social and economic risks and disrupt normal market conditions and operations. The impact of this outbreak, and other epidemics and pandemics that may arise in the future, could negatively affect the worldwide economy, as well as the economies of individual countries, individual companies and the market in general in significant and unforeseen ways. These developments as well as other events could result in further market volatility and negatively affect security prices, the liquidity of certain securities and the normal operations of securities exchanges and other markets. As a result, the risk environment remains elevated. The Adviser will monitor developments and seek to manage the Fund in a manner consistent with achieving the Fund’s investment objective, but there can be no assurance that it will be successful in doing so. Cybersecurity Risk – The Fund, its service providers, and third party fund distribution platforms, and your ability to transact with the Fund, may be negatively impacted due to operational risks arising from, among other issues, human errors, systems and technology disruptions or failures, or cybersecurity incidents. Cybersecurity incidents may allow an unauthorized party to gain access to fund assets, customer data, or proprietary information, or cause the Fund or its service providers, as well as the securities trading venues and their service providers, to suffer data corruption or lose operational functionality. The occurrence of any of these issues could result in a loss of information, regulatory scrutiny, reputational damage and other consequences, any of which could have a material adverse effect on the Fund or its shareholders. Cybersecurity incidents could also affect issuers of securities in which the Fund invests, leading to significant loss of value. Since there are risks inherent in all investments in securities, there is no assurance that the Fund’s objectives will be achieved.
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Risk Lose Money [Text] | rr_RiskLoseMoney | If the value of the Fund shares or the values of the Fund’s investments go down, you may lose money. | ||
Bar Chart and Performance Table [Heading] | rr_BarChartAndPerformanceTableHeading | Performance | ||
Performance Narrative [Text Block] | rr_PerformanceNarrativeTextBlock | The bar chart shown below provides some indication of the risks of investing in the Fund. The chart shows the variability of the Fund’s total return for the last ten calendar years(1). Updated performance information for the Fund is available on our website at www.nicholasfunds.com.
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Performance Information Illustrates Variability of Returns [Text] | rr_PerformanceInformationIllustratesVariabilityOfReturns | The bar chart shown below provides some indication of the risks of investing in the Fund. The chart shows the variability of the Fund’s total return for the last ten calendar years(1). | ||
Performance Availability Website Address [Text] | rr_PerformanceAvailabilityWebSiteAddress | www.nicholasfunds.com | ||
Performance Past Does Not Indicate Future [Text] | rr_PerformancePastDoesNotIndicateFuture | Of course, the Fund’s past performance (before and after taxes) is no guarantee of its future returns. | ||
Bar Chart Closing [Text Block] | rr_BarChartClosingTextBlock | For the ten calendar year periods shown in the above bar chart, the highest quarterly return was 24.01% (for the quarter ended June 30, 2020) and the lowest quarterly return was -23.35% (for the quarter ended March 31, 2020).
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Performance Table Uses Highest Federal Rate | rr_PerformanceTableUsesHighestFederalRate | After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. | ||
Performance Table Not Relevant to Tax Deferred | rr_PerformanceTableNotRelevantToTaxDeferred | Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts. | ||
Performance Table Narrative | rr_PerformanceTableNarrativeTextBlock | This next table shows how the Fund’s average annual total returns for the one, five and ten year periods ending on December 31, 2022 (the Fund’s most recently completed calendar year), compared to the returns of broad measures of market performance and the performance average of similar mutual funds. The table also shows the Fund’s average annual total returns after taxes on distributions and after taxes on distributions and the redemption of all of your Fund shares. After-tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts.
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Performance Table Closing [Text Block] | rr_PerformanceTableClosingTextBlock | Of course, the Fund’s past performance (before and after taxes) is no guarantee of its future returns.
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Class I | NICHOLAS II INC | Class I | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
Maximum Sales Charge (Load) Imposed on Purchases | rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice | none | ||
Maximum Deferred Sales Charge (Load) | rr_MaximumDeferredSalesChargeOverOther | none | ||
Maximum Sales Charge (Load) Imposed on Reinvested Dividends | rr_MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther | none | ||
Wire Redemption Fee | rr_RedemptionFee | $ 15.00 | ||
Exchange Fee | rr_ExchangeFeeOverRedemption | none | ||
Management Fees | rr_ManagementFeesOverAssets | 0.52% | ||
Distribution (12b-1) Fees | rr_DistributionAndService12b1FeesOverAssets | none | ||
Other Expenses | rr_OtherExpensesOverAssets | 0.07% | ||
Total Annual Fund Operating Expenses | rr_ExpensesOverAssets | 0.59% | ||
One Year | rr_ExpenseExampleYear01 | $ 60 | ||
Three Years | rr_ExpenseExampleYear03 | 189 | ||
Five Years | rr_ExpenseExampleYear05 | 329 | ||
Ten Years | rr_ExpenseExampleYear10 | $ 738 | ||
2013 | rr_AnnualReturn2013 | 32.74% | [1] | |
2014 | rr_AnnualReturn2014 | 11.27% | [1] | |
2015 | rr_AnnualReturn2015 | 0.92% | [1] | |
2016 | rr_AnnualReturn2016 | 4.87% | [1] | |
2017 | rr_AnnualReturn2017 | 25.63% | [1] | |
2018 | rr_AnnualReturn2018 | (4.74%) | [1] | |
2019 | rr_AnnualReturn2019 | 34.88% | [1] | |
2020 | rr_AnnualReturn2020 | 15.72% | [1] | |
2021 | rr_AnnualReturn2021 | 21.58% | [1] | |
2022 | rr_AnnualReturn2022 | (18.00%) | [1] | |
Year to Date Return, Label | rr_YearToDateReturnLabel | year-to-date return | ||
Bar Chart, Year to Date Return, Date | rr_BarChartYearToDateReturnDate | Dec. 31, 2022 | ||
Bar Chart, Year to Date Return | rr_BarChartYearToDateReturn | (18.00%) | ||
Highest Quarterly Return, Label | rr_HighestQuarterlyReturnLabel | highest quarterly return | ||
Highest Quarterly Return, Date | rr_BarChartHighestQuarterlyReturnDate | Jun. 30, 2020 | ||
Highest Quarterly Return | rr_BarChartHighestQuarterlyReturn | 24.01% | ||
Lowest Quarterly Return, Label | rr_LowestQuarterlyReturnLabel | lowest quarterly return | ||
Lowest Quarterly Return, Date | rr_BarChartLowestQuarterlyReturnDate | Mar. 31, 2020 | ||
Lowest Quarterly Return | rr_BarChartLowestQuarterlyReturn | (23.35%) | ||
One Year | rr_AverageAnnualReturnYear01 | (18.00%) | ||
Five Year | rr_AverageAnnualReturnYear05 | 8.19% | ||
Ten Year | rr_AverageAnnualReturnYear10 | 11.28% | ||
Class I | NICHOLAS II INC | Return After Taxes on Distributions | Class I | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
One Year | rr_AverageAnnualReturnYear01 | (18.78%) | ||
Five Year | rr_AverageAnnualReturnYear05 | 6.22% | ||
Ten Year | rr_AverageAnnualReturnYear10 | 9.18% | ||
Class I | NICHOLAS II INC | Return After Taxes on Distributions and Sale of Fund Shares | Class I | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
One Year | rr_AverageAnnualReturnYear01 | (10.17%) | ||
Five Year | rr_AverageAnnualReturnYear05 | 6.30% | ||
Ten Year | rr_AverageAnnualReturnYear10 | 8.88% | ||
Class I | NICHOLAS II INC | Russell Midcap Growth Index (reflects no deduction for fees, expenses or taxes) | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
One Year | rr_AverageAnnualReturnYear01 | (26.72%) | ||
Five Year | rr_AverageAnnualReturnYear05 | 7.64% | ||
Ten Year | rr_AverageAnnualReturnYear10 | 11.41% | ||
Class I | NICHOLAS II INC | Russell Midcap Index (reflects no deduction for fees, expenses or taxes) | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
One Year | rr_AverageAnnualReturnYear01 | (17.32%) | ||
Five Year | rr_AverageAnnualReturnYear05 | 7.10% | ||
Ten Year | rr_AverageAnnualReturnYear10 | 10.96% | ||
Class I | NICHOLAS II INC | Morningstar Mid-Cap Growth Category (reflects no deduction for taxes) | ||||
Risk/Return: | rr_RiskReturnAbstract | |||
One Year | rr_AverageAnnualReturnYear01 | (27.79%) | ||
Five Year | rr_AverageAnnualReturnYear05 | 7.09% | ||
Ten Year | rr_AverageAnnualReturnYear10 | 10.67% | ||
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