Label	Element	Value
Risk Return [Abstract]	rr_RiskReturnAbstract
ProspectusDate	rr_ProspectusDate	Oct. 01, 2012
DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC (Prospectus Summary) | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC
Risk Return [Abstract]	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	Fund Summary
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	The fund seeks the maximum amount of current income exempt from federal income tax as is consistent with the preservation of capital.
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.
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 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 15.11% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	15.11%
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The 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 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. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategy
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	To pursue its goal, the fund normally invests substantially all of its net assets in municipal bonds that provide income exempt from federal income tax. The fund invests at least 80% of its assets in municipal bonds rated A or higher, or the unrated equivalent as determined by The Dreyfus Corporation. The fund may invest up to 20% of its assets in municipal bonds rated below A, including bonds rated below investment grade ("high yield" or "junk" bonds) or the unrated equivalent as determined by The Dreyfus Corporation. The fund generally maintains a dollar-weighted average portfolio maturity between three and ten years. The portfolio managers focus on identifying undervalued sectors and securities. To select municipal bonds for the fund, the portfolio managers use fundamental credit analysis to estimate the relative value and attractiveness of various sectors and securities and actively trade among various sectors, based on their apparent relative values. Although the fund seeks to provide income exempt from federal income tax, income from some of the fund's holdings may be subject to the federal alternative minimum tax. In addition, the fund temporarily may invest in taxable bonds.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency. It is not a complete investment program. The fund's share price fluctuates, sometimes dramatically, which means you could lose money.    o Municipal bond market risk. The amount of public information available about municipal bonds is generally less than that for corporate equities or bonds. Special factors, such as legislative changes, and state and local economic and business developments, may adversely affect the yield and/or value of the fund's investments in municipal bonds. Other factors include the general conditions of the municipal bond market, the size of the particular offering, the maturity of the obligation and the rating of the issue. Changes in economic, business or political conditions relating to a particular municipal project, municipality, or state in which the fund invests may have an impact on the fund's share price. o Interest rate risk. Prices of municipal bonds tend to move inversely with changes in interest rates. Typically, a rise in rates will adversely affect bond prices and, accordingly, the fund's share price. The longer the effective maturity and duration of the fund's portfolio, the more the fund's share price is likely to react to interest rates. o Credit risk. Failure of an issuer to make timely interest or principal payments, or a decline or perception of a decline in the credit quality of a municipal bond, can cause the bond's price to fall, potentially lowering the fund's share price. The lower a bond's credit rating, the greater the chance - in the rating agency's opinion - that the bond issuer will default or fail to meet its payment obligations. To the extent the fund invests in high yield ("junk") bonds, its portfolio is subject to heightened credit risk. o Liquidity risk. When there is little or no active trading market for specific types of securities, it can become more difficult to sell the securities at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically, even during periods of declining interest rates. The secondary market for certain municipal bonds tends to be less well developed or liquid than many other securities markets, which may adversely affect the fund's ability to sell such municipal bonds at attractive prices.
Risk Lose Money [Text]	rr_RiskLoseMoney	The fund's share price fluctuates, sometimes dramatically, which means you could lose money.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the fund is not a bank deposit. It is not insured or guaranteed by the Federal Deposit Insurance Corporation (FDIC) or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table provide some indication of the risks of investing in the fund. The table compares the average annual total returns of the fund's shares to those of a broad measure of market performance. The fund's past performance (before and after taxes) is no guarantee of future results. More recent performance information may be available at www.dreyfus.com.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table provide some indication of the risks of investing in the fund.
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	www.dreyfus.com
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The fund's past performance (before and after taxes) is no guarantee of future results.
Bar Chart [Heading]	rr_BarChartHeading	Year-by-Year Total Returns as of 12/31 each year (%)
Bar Chart Narrative [Text Block]	rr_BarChartNarrativeTextBlock	The bar chart shows changes in the performance of the fund's shares from year to year.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best Quarter Q3, 2009: 5.94% Worst Quarter  Q4, 2010: -3.51% The fund's year-to-date total return as of 6/30/12 was 2.50%.
Index No Deduction for Fees, Expenses, Taxes [Text]	rr_IndexNoDeductionForFeesExpensesTaxes	reflects no deduction for fees, expenses or taxes
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	After-tax returns are calculated using the historical highest individual federal marginal 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 the investor's tax situation and may differ from those shown, and the after tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Performance Table Narrative	rr_PerformanceTableNarrativeTextBlock	After-tax returns are calculated using the historical highest individual federal marginal tax rates, and do not reflect the impact of state and local taxes. Actual after-tax returns depend on the investor's tax situation and may differ from those shown, and the after tax returns shown are not relevant to investors who hold their shares through tax-deferred arrangements such as 401(k) plans or individual retirement accounts.
Caption	rr_AverageAnnualReturnCaption	Average Annual Total Returns (as of 12/31/11)
DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC (Prospectus Summary) | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC | Barclays 7-Year Municipal Bond Index
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Barclays 7-Year Municipal Bond Index reflects no deduction for fees, expenses or taxes
1 Year	rr_AverageAnnualReturnYear01	10.15%
5 Years	rr_AverageAnnualReturnYear05	6.38%
10 Years	rr_AverageAnnualReturnYear10	5.63%
DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC (Prospectus Summary) | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC
Risk Return [Abstract]	rr_RiskReturnAbstract
Management fees	rr_ManagementFeesOverAssets	0.60%
Other expenses (including shareholder services fees)	rr_OtherExpensesOverAssets	0.16%
Total annual fund operating expenses	rr_ExpensesOverAssets	0.76%
Expense Example, with Redemption, 1 Year	rr_ExpenseExampleYear01	78
Expense Example, with Redemption, 3 Years	rr_ExpenseExampleYear03	243
Expense Example, with Redemption, 5 Years	rr_ExpenseExampleYear05	422
Expense Example, with Redemption, 10 Years	rr_ExpenseExampleYear10	942
Annual Return 2002	rr_AnnualReturn2002	6.94%
Annual Return 2003	rr_AnnualReturn2003	3.87%
Annual Return 2004	rr_AnnualReturn2004	3.39%
Annual Return 2005	rr_AnnualReturn2005	2.01%
Annual Return 2006	rr_AnnualReturn2006	3.79%
Annual Return 2007	rr_AnnualReturn2007	2.75%
Annual Return 2008	rr_AnnualReturn2008	(1.44%)
Annual Return 2009	rr_AnnualReturn2009	10.47%
Annual Return 2010	rr_AnnualReturn2010	2.63%
Annual Return 2011	rr_AnnualReturn2011	9.99%
Year to Date Return, Label	rr_YearToDateReturnLabel	The fund's year-to-date total return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Jun. 30, 2012
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	2.50%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best Quarter
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Sep. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	5.94%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst Quarter
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2010
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(3.51%)
Label	rr_AverageAnnualReturnLabel	Fund returns before taxes
1 Year	rr_AverageAnnualReturnYear01	9.99%
5 Years	rr_AverageAnnualReturnYear05	4.78%
10 Years	rr_AverageAnnualReturnYear10	4.38%
DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC (Prospectus Summary) | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC | After Taxes on Distributions
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Fund returns after taxes on distributions
1 Year	rr_AverageAnnualReturnYear01	9.99%
5 Years	rr_AverageAnnualReturnYear05	4.78%
10 Years	rr_AverageAnnualReturnYear10	4.38%
DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC (Prospectus Summary) | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC | DREYFUS INTERMEDIATE MUNICIPAL BOND FUND INC | After Taxes on Distributions and Sales
Risk Return [Abstract]	rr_RiskReturnAbstract
Label	rr_AverageAnnualReturnLabel	Fund returns after taxes on distributions and sale of fund shares
1 Year	rr_AverageAnnualReturnYear01	7.72%
5 Years	rr_AverageAnnualReturnYear05	4.61%
10 Years	rr_AverageAnnualReturnYear10	4.30%