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Risk Return Abstract rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Jul. 30, 2021
PIMCO National Intermediate Municipal Bond Fund  
Risk Return Abstract rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading PIMCO National Intermediate Municipal Bond Fund
Objective [Heading] rr_ObjectiveHeading <span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Investment Objective</span>
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock The Fund seeks maximum tax exempt income.
Expense [Heading] rr_ExpenseHeading <span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Fees and Expenses of the Fund</span>
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock This table describes the fees and expenses that you may pay if you buy, hold and sell shares of the Fund. You may pay other fees, such as commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A shares of eligible funds offered by PIMCO Equity Series and PIMCO Funds. More information about these and other discounts is available in the “Classes of Shares” section on page 46 of the Fund’s prospectus, Appendix B to the Fund’s prospectus (Financial Firm-Specific Sales Charge Waivers and Discounts) or from your financial professional.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption <span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">Shareholder Fees (fees paid directly from your investment):</span>
Operating Expenses Caption [Text] rr_OperatingExpensesCaption <span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">Annual Fund Operating Expenses (expenses that you pay each </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;">year as a percentage of the value of your investment):</span>
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading <span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Portfolio Turnover</span>
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock The Fund pays transaction costs 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 the Annual Fund Operating Expenses or in the Example tables, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 18% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 18.00%
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts <span style="color:#323232;font-family:Arial;font-size:9.10pt;">You may qualify for sales </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">charge discounts if you and your family invest, or agree to invest in the future, at least </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">$100,000</span><span style="color:#323232;font-family:Arial;font-size:9.10pt;"> in Class A shares of eligible funds offered by PIMCO Equity Series and PIMCO Funds.</span>
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Expense Example [Heading] rr_ExpenseExampleHeading <span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">Example.</span>
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock The Example is intended to help you compare the cost of investing in Institutional Class, I-2, Class A or Class C shares of the Fund with the costs of investing in other mutual funds. The Example assumes that you invest $10,000 in the noted class of shares for the time periods indicated, and then redeem all 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:
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption <span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">If you redeem your shares at the end of each period:</span>
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption <span style="color:#323232;font-family:Arial;font-size:9.10pt;font-weight:bold;margin-left:0%;">If you do not redeem your shares:</span>
Strategy [Heading] rr_StrategyHeading <span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Principal Investment Strategies</span>
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in debt securities whose interest is, in the opinion of bond counsel for the issuer at the time of issuance, exempt from federal income tax (“Municipal Bonds”). Municipal Bonds generally are issued by or on behalf of states and local governments and their agencies, authorities and other instrumentalities.The Fund may invest in Fixed Income Instruments which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The Fund may invest without limitation in “private activity” bonds whose interest is a tax-preference item for purposes of the federal alternative minimum tax (“AMT”). For shareholders subject to the AMT, distributions derived from “private activity” bonds must be included in their AMT calculations, and as such a portion of the Fund’s distribution may be subject to federal income tax. The Fund may invest more than 25% of its total assets in bonds of issuers in California and New York. To the extent that the Fund concentrates its investments in California or New York, it will be subject to California or New York State-Specific Risk. The Fund may also invest 25% or more of its total assets in Municipal Bonds that finance education, health care, housing, transportation, utilities and other similar projects, and 25% or more of its total assets in industrial development bonds. The Fund may invest the remainder of its net assets in other types of Fixed Income Instruments. “Fixed Income Instruments” include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The average portfolio duration of this Fund normally varies within (negative) 2 years to positive 4 years of the portfolio duration of the securities comprising the Bloomberg Barclays 1-15 Year Municipal Bond Index, as calculated by Pacific Investment Management Company LLC (“PIMCO”), which as of May 31, 2021 was 4.83 years. Duration is a measure used to determine the sensitivity of a security’s price to changes in interest rates. The longer a security’s duration, the more sensitive it will be to changes in interest rates. The portfolio manager focuses on bonds with the potential to offer attractive current income, typically looking for bonds that can provide consistently attractive current yields or that are trading at competitive market prices. Capital appreciation, if any, generally arises from decreases in interest rates or improving credit fundamentals for a particular state, municipality or issuer.The Fund invests primarily in investment grade debt securities, but may invest up to 10% of its total assets in Municipal Bonds or “private activity” bonds which are high yield securities (“junk bonds”), as rated by Moody’s Investors Service, Inc. (“Moody’s”), Standard & Poor’s Ratings Services (“S&P”) or Fitch, Inc. (“Fitch”), or, if unrated, as determined by PIMCO. In the event that ratings services assign different ratings to the same security, PIMCO will use the highest rating as the credit rating for that security.The Fund may invest in derivative instruments, such as options, futures contracts or swap agreements, and invest in mortgage- or asset-backed securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may also invest in securities issued by entities, such as trusts, whose underlying assets are Municipal Bonds, including, without limitation, residual interest bonds. The Fund may, without limitation, seek to obtain market exposure to the securities in which it primarily invests by entering into a series of purchase and sale contracts or by using other investment techniques (such as buy backs or dollar rolls). The Fund may also invest up to 10% of its total assets in preferred securities.
Risk [Heading] rr_RiskHeading <span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Principal Risks</span>
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock It is possible to lose money on an investment in the Fund. The principal risks of investing in the Fund, which could adversely affect its net asset value, yield and total return, are listed below.Interest Rate Risk:  the risk that fixed income securities will decline in value because of an increase in interest rates; a fund with a longer average portfolio duration will be more sensitive to changes in interest rates than a fund with a shorter average portfolio durationCall Risk:  the risk that an issuer may exercise its right to redeem a fixed income security earlier than expected (a call). Issuers may call outstanding securities prior to their maturity for a number of reasons (e.g., declining interest rates, changes in credit spreads and improvements in the issuer’s credit quality). If an issuer calls a security that the Fund has invested in, the Fund may not recoup the full amount of its initial investment and may be forced to reinvest in lower-yielding securities, securities with greater credit risks or securities with other, less favorable featuresCredit Risk:  the risk that the Fund could lose money if the issuer or guarantor of a fixed income security, or the counterparty to a derivative contract, is unable or unwilling, or is perceived (whether by market participants, rating agencies, pricing services or otherwise) as unable or unwilling, to meet its financial obligationsHigh Yield Risk:  the risk that high yield securities and unrated securities of similar credit quality (commonly known as “junk bonds”) are subject to greater levels of credit, call and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer’s continuing ability to make principal and interest payments, and may be more volatile than higher-rated securities of similar maturityMarket Risk:  the risk that the value of securities owned by the Fund may go up or down, sometimes rapidly or unpredictably, due to factors affecting securities markets generally or particular industriesIssuer Risk:  the risk that the value of a security may decline for a reason directly related to the issuer, such as management performance, financial leverage and reduced demand for the issuer’s goods or servicesLiquidity Risk:  the risk that a particular investment may be difficult to purchase or sell and that the Fund may be unable to sell illiquid investments at an advantageous time or price or achieve its desired level of exposure to a certain sector. Liquidity risk may result from the lack of an active market, reduced number and capacity of traditional market participants to make a market in fixed income securities, and may be magnified in a rising interest rate environment or other circumstances where investor redemptions from fixed income funds may be higher than normal, causing increased supply in the market due to selling activityDerivatives Risk:  the risk of investing in derivative instruments (such as futures, swaps and structured securities), including leverage, liquidity, interest rate, market, credit and management risks, and valuation complexity. Changes in the value of a derivative may not correlate perfectly with, and may be more sensitive to market events than, the underlying asset, rate or index, and the Fund could lose more than the initial amount invested. The Fund’s use of derivatives may result in losses to the Fund, a reduction in the Fund’s returns and/or increased volatility. Over-the-counter (“OTC”) derivatives are also subject to the risk that a counterparty to the transaction will not fulfill its contractual obligations to the other party, as many of the protections afforded to centrally-cleared derivative transactions might not be available for OTC derivatives. The primary credit risk on derivatives that are exchange-traded or traded through a central clearing counterparty resides with the Fund's clearing broker or the clearinghouse. Changes in regulation relating to a mutual fund’s use of derivatives and related instruments could potentially limit or impact the Fund’s ability to invest in derivatives, limit the Fund’s ability to employ certain strategies that use derivatives and/or adversely affect the value of derivatives and the Fund’s performanceEquity Risk:  the risk that the value of equity securities, such as common stocks and preferred securities, may decline due to general market conditions which are not specifically related to a particular company or to factors affecting a particular industry or industries. Equity securities generally have greater price volatility than fixed income securitiesMortgage-Related and Other Asset-Backed Securities Risk:  the risks of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk, prepayment risk and credit riskLeveraging Risk:  the risk that certain transactions of the Fund, such as reverse repurchase agreements, loans of portfolio securities, and the use of when-issued, delayed delivery or forward commitment transactions, or derivative instruments, may give rise to leverage, magnifying gains and losses and causing the Fund to be more volatile than if it had not been leveraged. This means that leverage entails a heightened risk of lossManagement Risk:  the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that actual or potential conflicts of interest, legislative, regulatory, or tax restrictions, policies or developments may affect the investment techniques available to PIMCO and the individual portfolio manager in connection with managing the Fund and may cause PIMCO to restrict or prohibit participation in certain investments. There is no guarantee that the investment objective of the Fund will be achievedMunicipal Bond Risk:  the risk that a Fund may be affected significantly by the economic, regulatory or political developments affecting the ability of issuers of Municipal Bonds to pay interest or repay principalCalifornia State-Specific Risk:  the risk that by concentrating its investments in California Municipal Bonds, the Fund may be affected significantly by economic, regulatory or political developments affecting the ability of California issuers to pay interest or repay principalNew York State-Specific Risk:  the risk that by concentrating its investments in New York Municipal Bonds, the Fund may be affected significantly by economic, regulatory or political developments affecting the ability of New York issuers to pay interest or repay principalMunicipal Project-Specific Risk:  the risk that the Fund may be more sensitive to adverse economic, business or political developments if it invests a substantial portion of its assets in the bonds of similar projects (such as those relating to education, health care, housing, transportation, and utilities), industrial development bonds, or in bonds from issuers in a single stateShort Exposure Risk:  the risk of entering into short sales, including the potential loss of more money than the actual cost of the investment, and the risk that the third party to the short sale will not fulfill its contractual obligations, causing a loss to the FundPlease see “Description of Principal Risks” in the Fund's prospectus for a more detailed description of the risks of investing in the Fund. An investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Risk Lose Money [Text] rr_RiskLoseMoney <span style="color:#323232;font-family:Arial;font-size:9.10pt;margin-left:0%;">It is possible to lose money on an investment in the Fund. </span>
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution <span style="color:#323232;font-family:Arial;font-size:9.10pt;">An </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">investment in the Fund is not a deposit of a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.</span>
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading <span style="color:#00687D;font-family:Arial;font-size:10.92pt;font-weight:bold;margin-left:0%;">Performance Information</span>
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock The performance information shows summary performance information for the Fund in a bar chart and an Average Annual Total Returns table. The information provides some indication of the risks of investing in the Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of a broad-based securities market index and an index of similar funds. Absent any applicable fee waivers and/or expense limitations, performance would have been lower. The bar chart shows performance of the Fund’s Institutional Class shares. Performance for Class A and Class C shares in the Average Annual Total Returns table reflects the impact of sales charges. The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.The Bloomberg Barclays 1-15 Year Municipal Bond Index is the 1-15 Year (1-17) component of the Bloomberg Barclays Municipal Bond Index. The Bloomberg Barclays Municipal Bond Index is a rules-based, market-value-weighted index engineered for the long term tax-exempt bond market. To be included in the Index, bonds must be rated investment-grade (Baa3/ BBB- or higher) by at least two of the following ratings agencies: Moody’s, S&P and Fitch. If only two of the three agencies rate the security, the lower rating is used to determine index eligibility. If only one of the three agencies rates a security, the rating must be investment-grade. They must have an outstanding par value of at least $7 million and be issued as part of a transaction of at least $75 million. The bonds must be fixed rate, have a dated-date after December 31, 1990, and must be at least one year from their maturity date. Remarketed issues, taxable municipal bonds, bonds with floating rates, and derivatives, are excluded from the benchmark. The Lipper Intermediate Municipal Debt Funds Average is a total return performance average of Funds tracked by Lipper, Inc. that invest in municipal debt issues with dollar-weighted average maturities of five to ten years.Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily and quarterly updates on the net asset value and performance page at https://www.pimco.com/en-us/product-finder.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns <span style="color:#323232;font-family:Arial;font-size:9.10pt;">The information provides some indication of the risks of investing in the </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">Fund by showing changes in its performance from year to year and by showing how the Fund’s average annual returns compare with the returns of a broad-based securities market index and an index of similar funds.</span>
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex <span style="color:#323232;font-family:Arial;font-size:9.10pt;margin-left:0%;">The Bloomberg Barclays 1-15 Year Municipal Bond Index is the 1-15 </span><span style="color:#323232;font-family:Arial;font-size:9.10pt;">Year (1-17) component of the Bloomberg Barclays Municipal Bond Index. The Bloomberg Barclays Municipal Bond Index is a rules-based, market-value-weighted index engineered for the long term tax-exempt bond market. To be included in the Index, bonds must be rated investment-grade (Baa3/ BBB- or higher) by at least two of the following ratings agencies: Moody’s, S&P and Fitch. If only two of the three agencies rate the security, the lower rating is used to determine index eligibility. If only one of the three agencies rates a security, the rating must be investment-grade. They must have an outstanding par value of at least $7 million and be issued as part of a transaction of at least $75 million. The bonds must be fixed rate, have a dated-date after December 31, 1990, and must be at least one year from their maturity date. Remarketed issues, taxable municipal bonds, bonds with floating rates, and derivatives, are excluded from the benchmark. The Lipper Intermediate Municipal Debt Funds Average is a total return performance average of Funds tracked by Lipper, Inc. that invest in municipal debt issues with dollar-weighted average maturities of five to ten years.</span>
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress <span style="color:#3333FF;font-family:Arial;font-size:9.10pt;">https://www.pimco.com/en-us/product-finder</span>
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture <span style="color:#323232;font-family:Arial;font-size:9.10pt;font-style:italic;">The Fund’s past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.</span>
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Institutional Class
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock Best QuarterJune 30, 20203.11%Worst QuarterDecember 31, 2016-4.09%Year-to-DateJune 30, 20210.90%
Performance Table Heading rr_PerformanceTableHeading <span style="color:#323232;font-family:Arial;font-size:9.50pt;font-weight:bold;margin-left:0%;">Average Annual Total Returns (for periods ended 12/31/20)</span>
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate <span style="color:#323232;font-family:Arial;font-size:7.60pt;">After-tax returns are calculated using the highest historical individual federal marginal income tax rates and do not reflect the impact of state and local taxes. </span>
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred <span style="color:#323232;font-family:Arial;font-size:7.60pt;">Actual after-tax </span><span style="color:#323232;font-family:Arial;font-size:7.60pt;">returns depend on an investor’s tax situation and may differ from those shown, and the 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.</span>
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown <span style="color:#323232;font-family:Arial;font-size:7.60pt;"> After-tax returns are for Institutional Class shares only. After-tax </span><span style="color:#323232;font-family:Arial;font-size:7.60pt;">returns for other classes will vary.</span>
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher <span style="color:#323232;font-family:Arial;font-size:7.60pt;"> In some cases the return after taxes may exceed the return before taxes due </span><span style="color:#323232;font-family:Arial;font-size:7.60pt;">to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period.</span>
PIMCO National Intermediate Municipal Bond Fund | Institutional  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.45%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.45%
1 Year rr_ExpenseExampleYear01 $ 46
3 Years rr_ExpenseExampleYear03 144
5 Years rr_ExpenseExampleYear05 252
10 Years rr_ExpenseExampleYear10 $ 567
2013 rr_AnnualReturn2013 (2.26%)
2014 rr_AnnualReturn2014 6.97%
2015 rr_AnnualReturn2015 3.27%
2016 rr_AnnualReturn2016 (0.24%)
2017 rr_AnnualReturn2017 5.31%
2018 rr_AnnualReturn2018 1.08%
2019 rr_AnnualReturn2019 6.92%
2020 rr_AnnualReturn2020 4.57%
Year to Date Return, Label rr_YearToDateReturnLabel <span style="color:#323232;font-family:Arial;font-size:6.825pt;padding-left:0.0%;">Year-to-Date</span>
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.90%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel <span style="color:#323232;font-family:Arial;font-size:6.825pt;padding-left:0.0%;">Best Quarter</span>
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.11%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel <span style="color:#323232;font-family:Arial;font-size:6.825pt;padding-left:0.0%;">Worst Quarter</span>
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2016
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.09%)
1 Year rr_AverageAnnualReturnYear01 4.57%
5 Years rr_AverageAnnualReturnYear05 3.49%
Since Inception rr_AverageAnnualReturnSinceInception 3.45%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
PIMCO National Intermediate Municipal Bond Fund | I-2  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.55%
1 Year rr_ExpenseExampleYear01 $ 56
3 Years rr_ExpenseExampleYear03 176
5 Years rr_ExpenseExampleYear05 307
10 Years rr_ExpenseExampleYear10 $ 689
1 Year rr_AverageAnnualReturnYear01 4.47%
5 Years rr_AverageAnnualReturnYear05 3.39%
Since Inception rr_AverageAnnualReturnSinceInception 3.35%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
PIMCO National Intermediate Municipal Bond Fund | A  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 2.25%
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80%
1 Year rr_ExpenseExampleYear01 $ 305
3 Years rr_ExpenseExampleYear03 475
5 Years rr_ExpenseExampleYear05 659
10 Years rr_ExpenseExampleYear10 1,193
1 Year rr_ExpenseExampleNoRedemptionYear01 305
3 Years rr_ExpenseExampleNoRedemptionYear03 475
5 Years rr_ExpenseExampleNoRedemptionYear05 659
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,193
1 Year rr_AverageAnnualReturnYear01 1.85%
5 Years rr_AverageAnnualReturnYear05 2.67%
Since Inception rr_AverageAnnualReturnSinceInception 2.64%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
PIMCO National Intermediate Municipal Bond Fund | C  
Risk Return Abstract rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price) rr_MaximumDeferredSalesChargeOverOther 1.00%
Management Fees rr_ManagementFeesOverAssets 0.55%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.75%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.30%
1 Year rr_ExpenseExampleYear01 $ 232
3 Years rr_ExpenseExampleYear03 412
5 Years rr_ExpenseExampleYear05 713
10 Years rr_ExpenseExampleYear10 1,568
1 Year rr_ExpenseExampleNoRedemptionYear01 132
3 Years rr_ExpenseExampleNoRedemptionYear03 412
5 Years rr_ExpenseExampleNoRedemptionYear05 713
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,568
1 Year rr_AverageAnnualReturnYear01 2.68%
5 Years rr_AverageAnnualReturnYear05 2.62%
Since Inception rr_AverageAnnualReturnSinceInception 2.58%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
PIMCO National Intermediate Municipal Bond Fund | Return After Taxes on Distributions | Institutional  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.54% [1]
5 Years rr_AverageAnnualReturnYear05 3.45% [1]
Since Inception rr_AverageAnnualReturnSinceInception 3.41% [1]
PIMCO National Intermediate Municipal Bond Fund | Return After Taxes on Distributions and Sales of Fund Shares | Institutional  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.55% [1]
5 Years rr_AverageAnnualReturnYear05 3.20% [1]
Since Inception rr_AverageAnnualReturnSinceInception 3.14% [1]
PIMCO National Intermediate Municipal Bond Fund | Bloomberg Barclays 1-15 Year Municipal Bond Index (reflects no deductions for fees, expenses or taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.73%
5 Years rr_AverageAnnualReturnYear05 3.39%
Since Inception rr_AverageAnnualReturnSinceInception 3.16%
PIMCO National Intermediate Municipal Bond Fund | Lipper Intermediate Municipal Debt Funds Average (reflects no deductions for taxes)  
Risk Return Abstract rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.29%
5 Years rr_AverageAnnualReturnYear05 3.01%
Since Inception rr_AverageAnnualReturnSinceInception 2.78%
[1] After-tax returns are calculated using the highest historical 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 the 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. In some cases the return after taxes may exceed the return before taxes due to an assumed tax benefit from any losses on a sale of Fund shares at the end of the measurement period. After-tax returns are for Institutional Class shares only. After-tax returns for other classes will vary.