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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType 485BPOS
Document Period End Date dei_DocumentPeriodEndDate Jun. 01, 2011
Entity Registrant Name dei_EntityRegistrantName VALUE LINE AGGRESSIVE INCOME TRUST
Entity Central Index Key dei_EntityCentralIndexKey 0000783316
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jun. 01, 2011
Document Effective Date dei_DocumentEffectiveDate Jun. 01, 2011
Prospectus Date rr_ProspectusDate Jun. 01, 2011
Value Line Aggressive Income Trust
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading
Value Line
Aggressive Income Trust
Objective [Heading] rr_ObjectiveHeading
Investment objectives
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The investment objective of the Value Line Aggressive Income Trust (the “Fund”) is to maximize current income.
Objective, Secondary [Text Block] rr_ObjectiveSecondaryTextBlock
Capital appreciation is a secondary objective but only when consistent with the Fund’s primary objective.
Expense [Heading] rr_ExpenseHeading
Fees and expenses
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. There are no 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 o f 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 or in the example, affect the Fund’s performance. During the most recent fiscal year the Fund’s portfolio turnover rate was 42% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 42.00%
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 to 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 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’s operating expenses remain the same except in year one. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading
Principal investment strategies of the Fund
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
To achieve the Fund’s investment objectives, under normal conditions, EULAV Asset Management (the “Adviser”) invests at least 80% of the Fund’s net assets in higher-yielding, lower rated fixed-income corporate securities (also known as “junk bonds”). These securities are issued by companies that are rated B+ or lower for relative financial strength in either the Standard or Small and Mid-Cap Editions of The Value Line Investment Survey or rated BB+ or below by Standard & Poor’s Ratings Services (“S&P”) or Ba1 or below by Moody’s Investors Services, Inc. (“Moody’s”) or are determined by the Adviser to be of comparable credit quality. In deciding which securities to buy, hold or sell, the Adviser considers a number of factors, including the issuer’s creditworthiness, economic prospects and interest rate trends as well as the security’s credit rating.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration
To achieve the Fund’s investment objectives, under normal conditions, EULAV Asset Management (the “Adviser”) invests at least 80% of the Fund’s net assets in higher-yielding, lower rated fixed-income corporate securities (also known as “junk bonds”). These securities are issued by companies that are rated B+ or lower for relative financial strength in either the Standard or Small and Mid-Cap Editions of The Value Line Investment Survey or rated BB+ or below by Standard &Poor’s Ratings Services (“S&P”) or Ba1 or below by Moody’s Investors Services, Inc.
Risk [Heading] rr_RiskHeading
Principal risks of investing in the Fund
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
Investing in any mutual fund involves risk, including the risk that you may receive little or no return on your investment, and that you may lose part or all of your investment. Therefore, before you invest in this Fund you should carefully evaluate the risks. The price of Fund shares will increase and decrease according to changes in the value of the Fund's investments.
 
Higher-yielding, lower rated securities (junk bonds) have speculative characteristics, are subject to greater market fluctuations and involve greater investment risk, including the possibility of default or bankruptcy, and lack of liquidity and risk of loss of income and principal, than is the case with lower yielding, higher rated securities.
 
The Fund may have a high portfolio turnover rate which may result in higher brokerage commissions and may negatively affect the Fund's performance. Because the Fund is actively managed, its investment return depends on the ability of the Adviser to manage its portfolio successfully. There can be no guarantee that the Adviser's investment strategies will produce the desired results.
 
An investment in the Fund is not a complete investment program and you should consider it just one part of your total investment program. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
 
The Fund is not recommended for investors whose principal objectives are assured income or capital preservation. For a more complete discussion of risk, please turn to page 9.
Risk Lose Money [Text] rr_RiskLoseMoney
Investing in any mutual fund involves risk, including the risk that you may receive little or no return on your investment, and that you may lose part or all of your investment.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution
An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other governmental agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading
Fund performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
This bar chart and table can help you evaluate the potential risks of investing in the Fund. The bar chart below shows how returns for the Fund’s shares have varied over the past ten calendar years, and the table below shows the average annual total returns (before and after taxes) of these shares for one, five, and ten years compared to the performance of the Barclay’s Capital U.S. Corporate High - Yield Bond Index, which is a broad based market index. The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. Updated performance information is available at: www.vlfunds.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns
This bar chart and table can help you evaluate the potential risks of investing in the Fund. The bar chart below shows how returns for the Fund’s shares have varied over the past ten calendar years, and the table below shows the average annual total returns (before and after taxes) of these shares for one, five, and ten years compared to the performance of the Barclay’s Capital U.S. Corporate High - Yield Bond Index, which is a broad based market index.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress
www.vlfunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture
The Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading
Total Returns (before taxes) as of 12/31 each year
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
Best Quarter:
Q2 2009
+11.97%
Worst Quarter:
Q4 2008
-16.73%
     
The Fund's year-to-date return for the three months ended March 31, 2011, was 2.73%.
 
After-tax returns in the table below 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, and 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.
Year to Date Return, Label rr_YearToDateReturnLabel
Fund’s year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2011
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.73%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel
Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 11.97%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel
Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (16.73%)
Performance Table Heading rr_PerformanceTableHeading
Average annual total returns for periods ended December 31, 2010
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate
After-tax returns in the table below 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, and 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.
Value Line Aggressive Income Trust | VALUE LINE AGGRESSIVE INCOME TRUST
  
Risk/Return: rr_RiskReturnAbstract  
Trading Symbol dei_TradingSymbol vagix
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.75%
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.48%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.48%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.30%) [1]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.18%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 120
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 438
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 779
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,743
Annual Return 2001 rr_AnnualReturn2001 5.90%
Annual Return 2002 rr_AnnualReturn2002 (1.22%)
Annual Return 2003 rr_AnnualReturn2003 25.45%
Annual Return 2004 rr_AnnualReturn2004 10.30%
Annual Return 2005 rr_AnnualReturn2005 1.80%
Annual Return 2006 rr_AnnualReturn2006 8.89%
Annual Return 2007 rr_AnnualReturn2007 3.65%
Annual Return 2008 rr_AnnualReturn2008 (21.55%)
Annual Return 2009 rr_AnnualReturn2009 40.33%
Annual Return 2010 rr_AnnualReturn2010 10.64%
Label rr_AverageAnnualReturnLabel Return before taxes
1 Year rr_AverageAnnualReturnYear01 10.64%
5 Years rr_AverageAnnualReturnYear05 6.57%
10 Years rr_AverageAnnualReturnYear10 7.31%
Value Line Aggressive Income Trust | VALUE LINE AGGRESSIVE INCOME TRUST | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions
1 Year rr_AverageAnnualReturnYear01 8.29%
5 Years rr_AverageAnnualReturnYear05 4.13%
10 Years rr_AverageAnnualReturnYear10 4.58%
Value Line Aggressive Income Trust | VALUE LINE AGGRESSIVE INCOME TRUST | After Taxes on Distributions and Sales
  
Risk/Return: rr_RiskReturnAbstract  
Label rr_AverageAnnualReturnLabel Return after taxes on distributions and sale of Fund shares
1 Year rr_AverageAnnualReturnYear01 6.84%
5 Years rr_AverageAnnualReturnYear05 4.14%
10 Years rr_AverageAnnualReturnYear10 4.58%
Value Line Aggressive Income Trust | Barclay'S Capital U.S. Corporate High-Yield Bond Index
  
Risk/Return: rr_RiskReturnAbstract  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Label rr_AverageAnnualReturnLabel Barclay's Capital U.S. Corporate High-Yield Bond Index (reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 15.12%
5 Years rr_AverageAnnualReturnYear05 8.91%
10 Years rr_AverageAnnualReturnYear10 8.88%
[1] Effective June 1, 2011 through May 31, 2012, EULAV Asset Management (the "Adviser") and EULAV Securities LLC (the "Distributor") have contractually agreed to waive the portion of the management fee equal to 0.20% of the Fund's average daily net assets and the portion of the 12b-1 fee equal to 0.10% of the Fund's average daily net assets, respectively. The waivers cannot be terminated without the approval of the Fund's Board of Trustees.