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  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">The Fund strives to increase the value of your investment over the long-term (&amp;#8220;long-term growth&amp;#8221;).</rr:ObjectivePrimaryTextBlock>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0053</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0025</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0021</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0099</rr:ExpensesOverAssets>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ObjectivePrimaryTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">The Fund strives to increase the value of your investment over the long-term (&amp;#8220;long-term growth&amp;#8221;).</rr:ObjectivePrimaryTextBlock>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Fees and Expenses of the Fund&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Example: &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.&lt;br /&gt; The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same.&lt;br /&gt; Although your actual costs may be higher or lower, based on these assumptions, your costs would be:</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 22.70% of the average value of the portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Principal Investment Strategies&lt;/b&gt;</rr:StrategyHeading>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Performance&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="USD">101</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="USD">315</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="USD">547</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="USD">1213</rr:ExpenseExampleYear10>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">To pursue the Fund&amp;#8217;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&amp;#8217;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&amp;#8217;s size. In distinguishing company size in terms of sales volume, the Fund considers a company&amp;#8217;s sales volume relative to peer companies in the company&amp;#8217;s industry. In terms of market capitalization, the Fund generally considers companies with market capitalizations up to $2 billion as &amp;#8220;small,&amp;#8221; between $2 billion and $10 billion as &amp;#8220;medium,&amp;#8221; and greater than $10 billion as &amp;#8220;large.&amp;#8221; 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&amp;#8217;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&amp;#8217;s stock will achieve superior performance. It is anticipated that a major portion of the Fund&amp;#8217;s portfolio will be invested in common stocks of the types of companies, and in the manner, as described above.</rr:StrategyNarrativeTextBlock>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">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&amp;#8217;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&amp;#8217;s investments go down, you may lose money. &lt;br/&gt;&lt;br /&gt;The principal risks of investing in the Fund are:&lt;ul type = "square"&gt;&lt;li&gt;&lt;b&gt;Market Risk &lt;/b&gt;&amp;#8211; Market risk involves the possibility that the value of the Fund&amp;#8217;s investments will fluctuate as the stock market fluctuates over short- or longer-term periods. Common stock prices tend to be more volatile than other investment choices.&lt;/li&gt;&lt;/ul&gt;&lt;ul type = "square"&gt;&lt;li&gt;&lt;b&gt;Portfolio-Specific Risk &lt;/b&gt;&amp;#8211; 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.&lt;/li&gt;&lt;/ul&gt;&lt;ul type = "square"&gt;&lt;li&gt;&lt;b&gt;Selection Risk &lt;/b&gt;&amp;#8211; 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.&lt;/li&gt;&lt;/ul&gt; Since there are risks inherent in all investments in securities, there is no assurance that the Fund&amp;#8217;s objectives will be achieved.</rr:RiskNarrativeTextBlock>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.1445</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.13</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.1128</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapGrowthIndex_MemberClassN_Member" unitRef="pure">0.1581</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapIndex_MemberClassN_Member" unitRef="pure">0.1728</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberMorningstarMidCapGrowthCategory_MemberClassN_Member" unitRef="pure">0.1407</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0424</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0356</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0352</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapGrowthIndex_MemberClassN_Member" unitRef="pure">0.0323</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapIndex_MemberClassN_Member" unitRef="pure">0.0357</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberMorningstarMidCapGrowthCategory_MemberClassN_Member" unitRef="pure">0.0174</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.083</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0748</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0719</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapGrowthIndex_MemberClassN_Member" unitRef="pure">0.1032</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapIndex_MemberClassN_Member" unitRef="pure">0.1065</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberMorningstarMidCapGrowthCategory_MemberClassN_Member" unitRef="pure">0.0898</rr:AverageAnnualReturnYear10>
  <rr:ShareholderFeesCaption contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Shareholder Fees &lt;/b&gt;&lt;br/&gt;&lt;br /&gt;(fees paid directly from your investment)</rr:ShareholderFeesCaption>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Annual Fund Operating Expenses &lt;/b&gt;&lt;br/&gt;&lt;br /&gt;   (expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member" unitRef="pure">0.227</rr:PortfolioTurnoverRate>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">If the value of the Fund shares or the values of the Fund&amp;#8217;s investments go down, you may lose money.</rr:RiskLoseMoney>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">www.nicholasfunds.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:MaximumDeferredSalesChargeOverOfferingPrice decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:ExchangeFee decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="USD">0</rr:ExchangeFee>
  <rr:ObjectiveHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Investment Objective&lt;/b&gt;</rr:ObjectiveHeading>
  <rr:ExpenseHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Fees and Expenses of the Fund&lt;/b&gt;</rr:ExpenseHeading>
  <rr:ExpenseNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">The table below describes the fees and expenses that you may pay if you buy and hold shares of the Fund.</rr:ExpenseNarrativeTextBlock>
  <rr:ExpenseExampleHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Example: &lt;/b&gt;</rr:ExpenseExampleHeading>
  <rr:ExpenseExampleNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">This example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.&lt;br /&gt;&lt;b&gt;The Example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return each year and that the Fund&amp;#8217;s operating expenses remain the same.&lt;br /&gt;Although your actual costs may be higher or lower, based on these assumptions, your costs would be:&lt;/b&gt;</rr:ExpenseExampleNarrativeTextBlock>
  <rr:PortfolioTurnoverHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Portfolio Turnover&lt;/b&gt;</rr:PortfolioTurnoverHeading>
  <rr:PortfolioTurnoverTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">The Fund pays transaction costs, such as commissions, when it buys and sells securities (or &amp;#8220;turns over&amp;#8221; 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&amp;#8217;s performance. During the most recent fiscal year, the Fund&amp;#8217;s portfolio turnover rate was 22.70% of the average value of the portfolio.</rr:PortfolioTurnoverTextBlock>
  <rr:StrategyHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Principal Investment Strategies&lt;/b&gt;</rr:StrategyHeading>
  <rr:StrategyNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">To pursue the Fund&amp;#8217;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&amp;#8217;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&amp;#8217;s size. In distinguishing company size in terms of sales volume, the Fund considers a company&amp;#8217;s sales volume relative to peer companies in the company&amp;#8217;s industry. In terms of market capitalization, the Fund generally considers companies with market capitalizations up to $2 billion as&amp;#8220;small,&amp;#8221; between $2 billion and $10 billion as&amp;nbsp;&amp;#8220;medium,&amp;#8221; and greater than $10 billion as &amp;#8220;large.&amp;#8221; 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&amp;#8217;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&amp;#8217;s stock will achieve superior performance. It is anticipated that a major portion of the Fund&amp;#8217;s portfolio will be invested in common stocks of the types of companies, and in the manner, as described above.</rr:StrategyNarrativeTextBlock>
  <rr:RiskHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Principal Risks of Investing&lt;/b&gt;</rr:RiskHeading>
  <rr:BarChartAndPerformanceTableHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Performance&lt;/b&gt;</rr:BarChartAndPerformanceTableHeading>
  <rr:ManagementFeesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0053</rr:ManagementFeesOverAssets>
  <rr:DistributionAndService12b1FeesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0</rr:DistributionAndService12b1FeesOverAssets>
  <rr:OtherExpensesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0011</rr:OtherExpensesOverAssets>
  <rr:ExpensesOverAssets decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0064</rr:ExpensesOverAssets>
  <rr:AnnualReturn2003 id="Item_2" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.333</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 id="Item_3" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.1203</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 id="Item_4" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0563</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 id="Item_5" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0789</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 id="Item_6" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.0597</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 id="Item_7" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">-0.3103</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 id="Item_8" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.2879</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 id="Item_9" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.2155</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 id="Item_10" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">-0.0038</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 id="Item_11" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.1445</rr:AnnualReturn2012>
  <rr:BarChartHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Nicholas II, Inc. &amp;#8211; Class N linked to Class I&lt;/b&gt;</rr:BarChartHeading>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">For the ten calendar year periods shown in the above bar chart, the highest quarterly return was 15.32% (for the quarter ended June 30, 2003) and the lowest quarterly return was -21.54% (for the quarter ended December 31, 2008).</rr:BarChartClosingTextBlock>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">The bar chart shown below provides some indication of the risks of investing in the Fund. The chart shows the variability of the total return of the Fund&amp;#8217;s shares for the last ten calendar years&lt;sup&gt;(1)&lt;/sup&gt;.</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member">highest quarterly return</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member">2003-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.1532</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member">lowest quarterly return</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">-0.2154</rr:BarChartLowestQuarterlyReturn>
  <dei:DocumentType contextRef="Duration_29Jan2012_28Jan2013">485BPOS</dei:DocumentType>
  <dei:DocumentPeriodEndDate contextRef="Duration_29Jan2012_28Jan2013">2012-09-30</dei:DocumentPeriodEndDate>
  <dei:EntityRegistrantName contextRef="Duration_29Jan2012_28Jan2013">NICHOLAS II INC</dei:EntityRegistrantName>
  <dei:EntityCentralIndexKey contextRef="Duration_29Jan2012_28Jan2013">0000723455</dei:EntityCentralIndexKey>
  <dei:AmendmentFlag contextRef="Duration_29Jan2012_28Jan2013">false</dei:AmendmentFlag>
  <dei:DocumentCreationDate contextRef="Duration_29Jan2012_28Jan2013">2013-01-28</dei:DocumentCreationDate>
  <dei:DocumentEffectiveDate contextRef="Duration_29Jan2012_28Jan2013">2013-01-28</dei:DocumentEffectiveDate>
  <rr:ProspectusDate contextRef="Duration_29Jan2012_28Jan2013">2013-01-28</rr:ProspectusDate>
  <rr:RiskReturnHeading contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;SUMMARY &amp;#8211; NICHOLAS II, INC.&lt;/b&gt;</rr:RiskReturnHeading>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleShareholderFeesNICHOLASIIINCClassN column period compact * ~&lt;/div&gt;

</rr:ShareholderFeesTableTextBlock>
  <rr:ShareholderFeesCaption contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Shareholder Fees&lt;/b&gt;&lt;br /&gt;&lt;br /&gt;(fees paid directly from your investment)</rr:ShareholderFeesCaption>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleAnnualFundOperatingExpensesNICHOLASIIINCClassN column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0</rr:MaximumSalesChargeImposedOnPurchasesOverOfferingPrice>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleExpenseExampleTransposedNICHOLASIIINCClassN column period compact * ~&lt;/div&gt;

</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:MaximumDeferredSalesChargeOverOfferingPrice decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0</rr:MaximumDeferredSalesChargeOverOfferingPrice>
  <rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0</rr:MaximumSalesChargeOnReinvestedDividendsAndDistributionsOverOther>
  <rr:ShareholderFeeOther decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="USD">15</rr:ShareholderFeeOther>
  <rr:ExchangeFee decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="USD">0</rr:ExchangeFee>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleAnnualTotalReturnsNICHOLASIIINCClassNBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:OperatingExpensesCaption contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Annual Fund Operating Expenses&lt;/b&gt;&lt;br /&gt;&lt;br /&gt;(expenses that you pay each year as a percentage of the value of your investment)</rr:OperatingExpensesCaption>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">This next table shows how the average annual total returns for the Fund&amp;#8217;s Class N shares linked to Class I shares for the one, five and ten year periods ending on December 31, 2012 (the Fund&amp;#8217;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 average annual total returns for the Fund 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&amp;#8217;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. Updated performance information for the Fund is available on our website at www.nicholasfunds.com.</rr:PerformanceTableNarrativeTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNICHOLASIIINCClassN column period compact * ~&lt;/div&gt;

</rr:PerformanceTableTextBlock>
  <rr:YearToDateReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member">Fund&amp;#8217;s year-to-date return as of December 31, 2012</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member">2012-12-31</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="pure">0.1445</rr:BarChartYearToDateReturn>
  <rr:ExpenseExampleYear01 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="USD">65</rr:ExpenseExampleYear01>
  <rr:ExpenseExampleYear03 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="USD">205</rr:ExpenseExampleYear03>
  <rr:ExpenseExampleYear05 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="USD">357</rr:ExpenseExampleYear05>
  <rr:ExpenseExampleYear10 decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="USD">798</rr:ExpenseExampleYear10>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">Actual after-tax returns depend on an investor&amp;#8217;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.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Of course, the Fund&amp;#8217;s past performance (before and after taxes) is no guarantee of its future returns.&lt;/b&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:RiskNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">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&amp;#8217;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&amp;#8217;s investments go down, you may lose money.&lt;br /&gt;&lt;br /&gt;The principal risks of investing in the Fund are:&lt;ul type="square"&gt;&lt;li&gt;&lt;b&gt;Market Risk &amp;#8211; &lt;/b&gt;Market risk involves the possibility that the value of the Fund&amp;#8217;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.&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;b&gt;Portfolio-Specific Risk &amp;#8211; &lt;/b&gt;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.&lt;/li&gt;&lt;/ul&gt;&lt;ul type="square"&gt;&lt;li&gt;&lt;b&gt;Selection Risk &amp;#8211; &lt;/b&gt;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.&lt;/li&gt;&lt;/ul&gt;Since there are risks inherent in all investments in securities, there is no assurance that the Fund&amp;#8217;s objectives will be achieved.</rr:RiskNarrativeTextBlock>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">The bar chart shown below provides some indication of the risks of investing in the Fund. The chart shows the variability of the Fund&amp;#8217;s total return for the last ten calendar years&lt;sup&gt;(1)&lt;/sup&gt;. Updated performance information for the Fund is available on our website at www.nicholasfunds.com.</rr:PerformanceNarrativeTextBlock>
  <rr:AnnualReturn2003 id="Item_12" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.333</rr:AnnualReturn2003>
  <rr:AnnualReturn2004 id="Item_13" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.1203</rr:AnnualReturn2004>
  <rr:AnnualReturn2005 id="Item_14" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0594</rr:AnnualReturn2005>
  <rr:AnnualReturn2006 id="Item_15" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0825</rr:AnnualReturn2006>
  <rr:AnnualReturn2007 id="Item_16" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.064</rr:AnnualReturn2007>
  <rr:AnnualReturn2008 id="Item_17" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">-0.3077</rr:AnnualReturn2008>
  <rr:AnnualReturn2009 id="Item_18" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.2908</rr:AnnualReturn2009>
  <rr:AnnualReturn2010 id="Item_19" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.2194</rr:AnnualReturn2010>
  <rr:AnnualReturn2011 id="Item_20" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0001</rr:AnnualReturn2011>
  <rr:AnnualReturn2012 id="Item_21" decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.1484</rr:AnnualReturn2012>
  <rr:YearToDateReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member">Fund&amp;#8217;s year-to-date return as of December 31, 2012</rr:YearToDateReturnLabel>
  <rr:BarChartYearToDateReturnDate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member">2012-12-31</rr:BarChartYearToDateReturnDate>
  <rr:BarChartYearToDateReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.1484</rr:BarChartYearToDateReturn>
  <rr:HighestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member">highest quarterly return</rr:HighestQuarterlyReturnLabel>
  <rr:BarChartHighestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member">2003-06-30</rr:BarChartHighestQuarterlyReturnDate>
  <rr:BarChartHighestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.1532</rr:BarChartHighestQuarterlyReturn>
  <rr:LowestQuarterlyReturnLabel contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member">lowest quarterly return</rr:LowestQuarterlyReturnLabel>
  <rr:BarChartLowestQuarterlyReturnDate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member">2008-12-31</rr:BarChartLowestQuarterlyReturnDate>
  <rr:BarChartLowestQuarterlyReturn decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">-0.2141</rr:BarChartLowestQuarterlyReturn>
  <rr:BarChartClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">For the ten calendar year periods shown in the above bar chart, the highest quarterly return was 15.32% (for the quarter ended June 30, 2003) and the lowest quarterly return was -21.41% (for the quarter ended December 31, 2008).</rr:BarChartClosingTextBlock>
  <rr:PerformanceTableNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">This next table shows how the Fund&amp;#8217;s average annual total returns for the one, five and ten year periods ending on December 31, 2012 (the Fund&amp;#8217;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&amp;#8217;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&amp;#8217;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.</rr:PerformanceTableNarrativeTextBlock>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.1484</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.1334</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.116</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapGrowthIndex_MemberClassI_Member" unitRef="pure">0.1581</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapIndex_MemberClassI_Member" unitRef="pure">0.1728</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear01 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberMorningstarMidCapGrowthCategory_MemberClassI_Member" unitRef="pure">0.1407</rr:AverageAnnualReturnYear01>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0459</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0387</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0381</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapGrowthIndex_MemberClassI_Member" unitRef="pure">0.0323</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapIndex_MemberClassI_Member" unitRef="pure">0.0357</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear05 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberMorningstarMidCapGrowthCategory_MemberClassI_Member" unitRef="pure">0.0174</rr:AverageAnnualReturnYear05>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0859</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributions_MemberS000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0774</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013AfterTaxesOnDistributionsAndSales_MemberS000009134_MemberC000024843_MemberClassI_Member" unitRef="pure">0.0744</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapGrowthIndex_MemberClassI_Member" unitRef="pure">0.1032</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberRussellMidcapIndex_MemberClassI_Member" unitRef="pure">0.1065</rr:AverageAnnualReturnYear10>
  <rr:AverageAnnualReturnYear10 decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberMorningstarMidCapGrowthCategory_MemberClassI_Member" unitRef="pure">0.0898</rr:AverageAnnualReturnYear10>
  <rr:PortfolioTurnoverRate decimals="4" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member" unitRef="pure">0.227</rr:PortfolioTurnoverRate>
  <rr:RiskLoseMoney contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">If the value of the Fund shares or the values of the Fund&amp;#8217;s investments go down, you may lose money.</rr:RiskLoseMoney>
  <rr:PerformanceInformationIllustratesVariabilityOfReturns contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">The chart shows the variability of the Fund&amp;#8217;s total return for the last ten calendar years(1).</rr:PerformanceInformationIllustratesVariabilityOfReturns>
  <rr:PerformanceAvailabilityWebSiteAddress contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">www.nicholasfunds.com</rr:PerformanceAvailabilityWebSiteAddress>
  <rr:PerformancePastDoesNotIndicateFuture contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Of course, the Fund&amp;#8217;s past performance (before and after taxes) is no guarantee of its future returns.&lt;/b&gt;</rr:PerformancePastDoesNotIndicateFuture>
  <rr:PerformanceTableUsesHighestFederalRate contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">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.</rr:PerformanceTableUsesHighestFederalRate>
  <rr:PerformanceTableNotRelevantToTaxDeferred contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">Actual after-tax returns depend on an investor&amp;#8217;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.</rr:PerformanceTableNotRelevantToTaxDeferred>
  <rr:ShareholderFeesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleShareholderFeesNICHOLASIIINC column period compact * ~&lt;/div&gt;

</rr:ShareholderFeesTableTextBlock>
  <rr:AnnualFundOperatingExpensesTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleAnnualFundOperatingExpensesNICHOLASIIINC column period compact * ~&lt;/div&gt;

</rr:AnnualFundOperatingExpensesTableTextBlock>
  <rr:ExpenseExampleWithRedemptionTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleExpenseExampleTransposedNICHOLASIIINC column period compact * ~&lt;/div&gt;

</rr:ExpenseExampleWithRedemptionTableTextBlock>
  <rr:BarChartTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleAnnualTotalReturnsNICHOLASIIINCBarChart column period compact * ~&lt;/div&gt;

</rr:BarChartTableTextBlock>
  <rr:PerformanceTableTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;div style="display:none"&gt;~ http://www.nicholasfunds.com/role/ScheduleAverageAnnualTotalReturnsTransposedNICHOLASIIINC column period compact * ~&lt;/div&gt;

</rr:PerformanceTableTextBlock>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassI_Member">&lt;b&gt;Of course, the Fund&amp;#8217;s past performance (before and after taxes) is no guarantee of its future returns.&lt;/b&gt;</rr:PerformanceTableClosingTextBlock>
  <rr:PerformanceTableClosingTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">&lt;b&gt;Of course, the Fund&amp;#8217;s past performance (before and after taxes) is no guarantee of its future returns.&lt;/b&gt;</rr:PerformanceTableClosingTextBlock>
  <rr:ShareholderFeeOther decimals="INF" contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberC000024844_MemberClassN_Member" unitRef="USD">15.00</rr:ShareholderFeeOther>
  <rr:BarChartReturnsForClassNotOfferedInProspectus contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">Class N shares of the Fund were first offered for sale on February 28, 2005; therefore, the performance information shown for periods prior to February 28, 2005 represents the performance for the original share class of the Fund, the Class I shares.</rr:BarChartReturnsForClassNotOfferedInProspectus>
  <rr:PerformanceNarrativeTextBlock contextRef="Duration_29Jan2012_28Jan2013S000009134_MemberClassN_Member">Class N shares of the Fund were first offered for sale on February 28, 2005; therefore, the performance information shown for periods prior to February 28, 2005 represents the performance for the original share class of the Fund, the Class I shares. Nicholas II ? Class I shares were first offered for sale on October 17, 1983.&lt;br/&gt;&lt;br/&gt;The bar chart shown below provides some indication of the risks of investing in the Fund. The chart shows the variability of the total return of the Fund?s shares for the last ten calendar years(1). Updated performance information for the Fund is available on our website at www.nicholasfunds.com.</rr:PerformanceNarrativeTextBlock>
  <link:footnoteLink xlink:type="extended" xlink:role="http://www.xbrl.org/2003/role/link">
    <link:loc xlink:type="locator" xlink:href="#Item_2" xlink:label="AnnualReturn2003" />
    <link:footnote xlink:type="resource" xlink:label="footnote_AnnualReturn2003" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_AnnualReturn2003">The Fund's fiscal year end is September 30. As reflected in the bar chart, the Fund's year-to-date return as of December 31, 2012 was 14.45%. </link:footnote>
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    <link:loc xlink:type="locator" xlink:href="#Item_5" xlink:label="Item_5_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_6" xlink:label="Item_6_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_7" xlink:label="Item_7_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_8" xlink:label="Item_8_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_9" xlink:label="Item_9_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_10" xlink:label="Item_10_lbl" />
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    <link:loc xlink:type="locator" xlink:href="#Item_11" xlink:label="Item_11_lbl" />
    <link:footnoteArc xlink:type="arc" xlink:arcrole="http://www.xbrl.org/2003/arcrole/fact-footnote" xlink:from="Item_11_lbl" xlink:to="footnote_AnnualReturn2003" use="optional" priority="0" order="1.0" />
    <link:loc xlink:type="locator" xlink:href="#Item_12" xlink:label="AnnualReturn2003_2" />
    <link:footnote xlink:type="resource" xlink:label="footnote_AnnualReturn2003_2" xlink:role="http://www.xbrl.org/2003/role/footnote" xml:lang="en-US" id="footnote_AnnualReturn2003_2">The Fund's fiscal year end is September 30. As reflected in the bar chart, the Fund's year-to-date return as of December 31, 2012 was 14.84%.</link:footnote>
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