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Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Fund Summary - BNY Mellon Intermediate Bond Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The fund seeks total return (consisting of capital appreciation and current income).

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 44.76% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 44.76%
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 at least 80% of its net assets, plus any borrowings for investment purposes, in bonds. The investment adviser actively manages bond market and maturity exposure and credit profile and uses a disciplined process to select bonds and manage risk. The process includes computer modeling and scenario testing of possible changes in market conditions. The investment adviser will use other techniques in an attempt to manage market risk and duration.


The fund's investments in bonds must be rated investment grade (i.e., Baa/BBB or higher) at the time of purchase or, if unrated, deemed of comparable quality by the investment adviser. Investments in bonds may include mortgage-related securities and municipal securities. Generally, the fund's average effective portfolio maturity will be between 3 and 10 years and the average effective duration of the fund's portfolio will be between 2.5 and 5.5 years. The fund may invest in individual bonds of any maturity or duration. Average effective portfolio maturity is an average of the maturities of bonds held by the fund directly and the bonds underlying derivative instruments entered into by the fund, if any, adjusted to reflect provisions or market conditions that may cause a bond's principal to be repaid earlier than at its stated maturity. Duration is an indication of an investment's "interest rate risk," or how sensitive a bond or the fund’s portfolio may be to changes in interest rates.

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.


· Government securities risk. Not all obligations of the U.S. government, its agencies and instrumentalities are backed by the full faith and credit of the U.S. Treasury. Some obligations are backed only by the credit of the issuing agency or instrumentality, and in some cases there may be some risk of default by the issuer. Any guarantee by the U.S. government or its agencies or instrumentalities of a security held by the fund does not apply to the market value of such security or to shares of the fund itself. A security backed by the U.S. Treasury or the full faith and credit of the United States is guaranteed only as to the timely payment of interest and principal when held to maturity. In addition, because many types of U.S. government securities trade actively outside the United States, their prices may rise and fall as changes in global economic conditions affect the demand for these securities.


· Interest rate risk. Prices of 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 fixed-income portfolio, the more the fund's share price is likely to react to interest rates. For example, the market price of a fixed-income security with a duration of three years would be expected to decline 3% if interest rates rose 1%. Conversely, the market price of the same security would be expected to increase 3% if interest rates fell 1%.


· Call risk. Some bonds give the issuer the option to call, or redeem, the bonds before their maturity date. If an issuer "calls" its bond during a time of declining interest rates, the fund might have to reinvest the proceeds in an investment offering a lower yield, and therefore might not benefit from any increase in value as a result of declining interest rates. During periods of market illiquidity or rising interest rates, prices of "callable" issues are subject to increased price fluctuation.


· 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 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.


· Market risk. The market value of a security may decline due to general market conditions that are not specifically related to a particular company, such as real or perceived adverse economic conditions, changes in the outlook for corporate earnings, changes in interest or currency rates or adverse investor sentiment generally. A security's market value also may decline because of factors that affect a particular industry or industries, such as labor shortages or increased production costs and competitive conditions within an industry, or factors that affect a particular company, such as management performance, financial leverage, and reduced demand for the company's products or services.


· Mortgage-related securities risk. Mortgage-related securities are complex derivative instruments, subject to credit, prepayment and extension risk, and may be more volatile and less liquid, and more difficult to price accurately, than more traditional debt securities. The fund is subject to the credit risk associated with these securities, including the market's perception of the creditworthiness of the issuing federal agency, as well as the credit quality of the underlying assets. Although certain mortgage-related securities are guaranteed as to the timely payment of interest and principal by a third party (such as a U.S. government agency or instrumentality with respect to government-related mortgage-backed securities) the market prices for such securities are not guaranteed and will fluctuate. Declining interest rates may result in the prepayment of higher yielding underlying mortgages and the reinvestment of proceeds at lower interest rates can reduce the fund's potential price gain in response to falling interest rates, reduce the fund's yield or cause the fund's share price to fall (prepayment risk). Rising interest rates may result in a drop in prepayments of the underlying mortgages, which would increase the fund's sensitivity to rising interest rates and its potential for price declines (extension risk).


· Municipal securities risk. The amount of public information available about municipal securities 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 securities. Other factors include the general conditions of the municipal securities 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, territory or possession of the United States in which the fund invests may have an impact on the fund's share price.


· 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 in a timely manner at or near their perceived value. In such a market, the value of such securities and the fund's share price may fall dramatically.

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 bar chart shows the performance of the fund's Class M shares from year to year. The table compares the average annual total returns of the fund's Class M shares and Investor shares to those of the Barclays Intermediate Government/Credit Bond Index, a broad-based, unmanaged, market-weighted index designed to measure the performance of the U.S. government and investment grade corporate bond market and is comprised of issues that must have a maturity from one to (but not including) ten years.


After-tax performance is shown only for Class M shares. After-tax performance of the fund's Investor shares will vary. 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.


The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future. Performance for each share class will vary due to differences in expenses.

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 Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The fund's past performance (before and after taxes) is not necessarily an indication of how the fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Year-by-Year Total Returns as of 12/31 each year (%) Class M
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best Quarter
Q4, 2008: 4.40%
 Worst Quarter
Q2, 2004: -2.68%


The year-to-date total return of the fund's Class M shares as of September 30, 2013 was -1.45%.

Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date total return of the fund's Class M shares
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn (1.45%)
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2008
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.40%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2004
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.68%)
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 One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax performance is shown only for Class M shares. After-tax performance of the fund's Investor shares will vary.
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns as of 12/31/12
Barclays Intermediate Government/Credit Bond Index reflects no deduction for fees, expenses or taxes
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.89%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.18%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.62%
Class M Shares
  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 0.40%
Other expenses - Shareholder services fees rr_Component1OtherExpensesOverAssets none
Other expenses - Administration fees rr_Component2OtherExpensesOverAssets 0.12%
Other expenses - Other expenses of the fund rr_Component3OtherExpensesOverAssets 0.04%
Total annual fund operating expenses rr_ExpensesOverAssets 0.56%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 57
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 179
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 313
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 701
Annual Return 2003 rr_AnnualReturn2003 4.13%
Annual Return 2004 rr_AnnualReturn2004 2.42%
Annual Return 2005 rr_AnnualReturn2005 0.72%
Annual Return 2006 rr_AnnualReturn2006 3.69%
Annual Return 2007 rr_AnnualReturn2007 7.16%
Annual Return 2008 rr_AnnualReturn2008 5.52%
Annual Return 2009 rr_AnnualReturn2009 6.16%
Annual Return 2010 rr_AnnualReturn2010 4.70%
Annual Return 2011 rr_AnnualReturn2011 4.11%
Annual Return 2012 rr_AnnualReturn2012 4.15%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 4.15%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.93%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 4.26%
Class M Shares | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.18%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.62%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.80%
Class M Shares | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 2.72%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 3.44%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 2.78%
Investor Shares
  
Risk/Return: rr_RiskReturnAbstract  
Investment advisory fees rr_ManagementFeesOverAssets 0.40%
Other expenses - Shareholder services fees rr_Component1OtherExpensesOverAssets 0.25%
Other expenses - Administration fees rr_Component2OtherExpensesOverAssets 0.12%
Other expenses - Other expenses of the fund rr_Component3OtherExpensesOverAssets 0.05%
Total annual fund operating expenses rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 262
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 455
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,014
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 3.88%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.66%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.97%