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Label Element Value
(PIMCO Government Money Market Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Institutional Class or I-2 shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): None [1]
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):
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Example. The Example is intended to help you compare the cost of investing in Institutional Class, I-2, Class M, Administrative Class, 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. Investors may pay brokerage commissions on their purchases and sales of Institutional Class shares or I-2 shares of the Fund, which are not reflected in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
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 a portfolio of U.S. government securities. The Fund invests 100% of its total assets in (i) cash, (ii) U.S. government securities, such as U.S. Treasury bills, notes, and other obligations issued by, or guaranteed as to principal and interest by, the U.S. government (including its agencies and instrumentalities), and (iii) repurchase agreements that are collateralized fully by such U.S. government securities or cash. The Fund may only invest in U.S. dollar-denominated securities that mature in 397 days or fewer from the date of purchase. The dollar-weighted average portfolio maturity of the Fund may not exceed 60 days and the dollar-weighted average life to maturity of the Fund may not exceed 120 days. The Fund attempts to maintain a stable net asset value of $1.00 per share, although there is no assurance that it will be successful in doing so.
The Fund's investments will comply with applicable rules governing the quality, maturity and diversification of securities held by money market funds.
The Fund may enter into reverse repurchase agreements and sale buy back transactions to satisfy redemption requests or for other temporary or emergency purposes.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. An investment in the Fund is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. The Fund's sponsor has no legal obligation to provide financial support to the Fund, and you should not expect that the sponsor will provide financial support to the Fund at any time. 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 duration
Call 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 features
Credit 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 obligations
Market 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 industries
Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that 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. There is no guarantee that the investment objective of the Fund will be achieved
Reverse Repurchase Agreements and Other Borrowings Risk: the risk that reverse repurchase agreements or other borrowings may increase the Fund's overall investment exposure and that the related transaction costs may detract from Fund performance
Please see "Description of Principal Risks" in the Fund's prospectus for a more detailed description of the risks of investing in the Fund.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
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 government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
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 Class M shares. For periods prior to the inception date of Class A, Class C and I-2 shares (May 14, 2009) and Institutional Class and Administrative Class shares (May 13, 2016), performance information shown in the table for that class is based on the performance of the Fund's Class M shares, adjusted to reflect the fees and expenses paid by these classes of shares. To obtain the Fund's current yield, call 888.87.PIMCO. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
The Fund's benchmark index is the FTSE 3-Month Treasury Bill Index. The index is an unmanaged index representing monthly return equivalents of yield averages of the last 3-month Treasury Bill issues. The Fund began operations on 01/27/09. Index comparisons began on 01/31/09. The Lipper Institutional U.S. Government Money Market Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest principally in financial instruments issued or guaranteed by the U.S. government, its agencies, or its instrumentalities with dollar-weighted average maturities of less than 90 days. These funds are commonly limited to 401(k) and pension participants and often require high minimum investments and have lower total expense ratios relative to other money market funds. They intend to keep constant net asset value.
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.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Class M*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
*The year-to-date return as of June 30, 2019 is 1.16%. For the periods shown in the bar chart, the highest quarterly return was 0.55% in the Q4 2018, and the lowest quarterly return was 0.00% in the Q3 2013.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended 12/31/18)
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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex 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 Class M shares. For periods prior to the inception date of Class A, Class C and I-2 shares (May 14, 2009) and Institutional Class and Administrative Class shares (May 13, 2016), performance information shown in the table for that class is based on the performance of the Fund's Class M shares, adjusted to reflect the fees and expenses paid by these classes of shares. To obtain the Fund's current yield, call 888.87.PIMCO. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.pimco.com/en-us/product-finder
(PIMCO Government Money Market Fund) | FTSE 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.86%
5 Years rr_AverageAnnualReturnYear05 0.60%
Since Inception rr_AverageAnnualReturnSinceInception 0.35%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Lipper Institutional U.S. Government Money Market Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.47%
5 Years rr_AverageAnnualReturnYear05 0.43%
Since Inception rr_AverageAnnualReturnSinceInception 0.25% [2]
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 58
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 101
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 230
1 Year rr_AverageAnnualReturnYear01 1.79%
5 Years rr_AverageAnnualReturnYear05 0.59%
Since Inception rr_AverageAnnualReturnSinceInception 0.33%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class I-2  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.28% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 29
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 90
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 157
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 356
1 Year rr_AverageAnnualReturnYear01 1.68%
5 Years rr_AverageAnnualReturnYear05 0.52%
Since Inception rr_AverageAnnualReturnSinceInception 0.29%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class M  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 58
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 101
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 230
Annual Return 2010 rr_AnnualReturn2010 0.06%
Annual Return 2011 rr_AnnualReturn2011 0.03%
Annual Return 2012 rr_AnnualReturn2012 0.05%
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 0.02%
Annual Return 2015 rr_AnnualReturn2015 0.05%
Annual Return 2016 rr_AnnualReturn2016 0.30%
Annual Return 2017 rr_AnnualReturn2017 0.81%
Annual Return 2018 rr_AnnualReturn2018 1.78%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2019 is 1.16%
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.16%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 0.55% in the Q4 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.55%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2018
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was 0.00% in the Q3 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2013
1 Year rr_AverageAnnualReturnYear01 1.78%
5 Years rr_AverageAnnualReturnYear05 0.59%
Since Inception rr_AverageAnnualReturnSinceInception 0.33%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 58
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 101
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 230
1 Year rr_AverageAnnualReturnYear01 1.79%
5 Years rr_AverageAnnualReturnYear05 0.59%
Since Inception rr_AverageAnnualReturnSinceInception 0.33%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.33% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 106
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 185
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 418
1 Year rr_AverageAnnualReturnYear01 1.63%
5 Years rr_AverageAnnualReturnYear05 0.49%
Since Inception rr_AverageAnnualReturnSinceInception 0.27%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.33% [3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 106
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 185
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 418
1 Year rr_AverageAnnualReturnYear01 1.63%
5 Years rr_AverageAnnualReturnYear05 0.49%
Since Inception rr_AverageAnnualReturnSinceInception 0.27%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Low Duration Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks maximum total return, consistent with preservation of capital and prudent investment management.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund. 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 33 of the Fund's prospectus, Appendix B to the Fund's prospectus (Financial Firm-Specific Sales Charge Waivers and Discounts) or from your financial advisor.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption 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 of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2020
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Example. The Example is intended to help you compare the cost of investing in Institutional Class, I-2, I-3, Administrative Class, Class A, Class C or Class R 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. Investors may pay brokerage commissions on their purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund, which are not reflected in the Example. 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 If you redeem your shares at the end of each period:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If you do not redeem your shares:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
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 573% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 573.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve its investment objective by investing under normal circumstances at least 65% of its total assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. "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 from one to three years based on PIMCO's market forecasts. 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 Fund invests primarily in investment grade debt securities, but may invest up to 10% of its total assets in 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. The Fund may invest up to 30% of its total assets in securities denominated in foreign currencies, and may invest beyond this limit in U.S. dollar-denominated securities of foreign issuers. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 20% of its total assets. The Fund may invest up to 10% of its total assets in securities and instruments that are economically tied to emerging market countries (this limitation does not apply to investment grade sovereign debt denominated in the local currency with less than 1 year remaining to maturity, which means the Fund may invest, together with any other investments denominated in foreign currencies, up to 30% of its total assets in such instruments).
The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities, subject to applicable law and any other restrictions described in the Fund's prospectus or Statement of Additional Information. 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, 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 "total return" sought by the Fund consists of income earned on the Fund's investments, plus capital appreciation, if any, which generally arises from decreases in interest rates, foreign currency appreciation, or improving credit fundamentals for a particular sector or security. The Fund may also invest up to 10% of its total assets in preferred securities.
Risk [Heading] rr_RiskHeading Principal Risks
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 duration
Call 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 features
Credit 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 obligations
High 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 maturity
Market 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 industries
Issuer 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 services
Liquidity 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 mutual funds may be higher than normal, causing increased supply in the market due to selling activity
Derivatives 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, mispricing or valuation complexity. Changes in the value of the 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. For derivatives traded on an exchange or through a central counterparty, credit risk resides with the Fund's clearing broker, or the clearinghouse itself, rather than with a counterparty in an OTC derivative transaction. 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 performance
Equity 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 securities
Mortgage-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 risk
Foreign (Non-U.S.) Investment Risk: the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, increased risk of delayed settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers
Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk
Sovereign Debt Risk: the risk that investments in fixed income instruments issued by sovereign entities may decline in value as a result of default or other adverse credit event resulting from an issuer's inability or unwillingness to make principal or interest payments in a timely fashion
Currency Risk: the risk that foreign (non-U.S.) currencies will change in value relative to the U.S. dollar and affect the Fund's investments in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign (non-U.S.) currencies
Leveraging 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 loss
Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that 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. There is no guarantee that the investment objective of the Fund will be achieved
Short 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 Fund
Please 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 It is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
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. For periods prior to the inception date of I-3 shares (April 27, 2018), performance information shown in the table for that class is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by that class of 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 ICE BofAML 1-3 Year U.S. Treasury Index is an unmanaged index comprised of U.S. Treasury securities, other than inflation protection securities and STRIPS, with at least $1 billion in outstanding face value and a remaining term to final maturity of at least one year and less than three years. The Lipper Short Investment Grade Debt Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest at least 65% of their assets in investment-grade debt issues (rated in the top four grades) with dollar-weighted average maturities of less than three 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.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Institutional Class*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
*The year-to-date return as of June 30, 2019 is 3.10%. For the periods shown in the bar chart, the highest quarterly return was 7.11% in the Q2 2009, and the lowest quarterly return was -1.85% in the Q2 2013.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended 12/31/18)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
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 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher 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.
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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex 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. For periods prior to the inception date of I-3 shares (April 27, 2018), performance information shown in the table for that class is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by that class of 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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are for Institutional Class shares only. After-tax returns for other classes will vary.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.pimco.com/en-us/product-finder
(PIMCO Low Duration Fund) | ICE BofAML 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.58%
5 Years rr_AverageAnnualReturnYear05 0.81%
10 Years rr_AverageAnnualReturnYear10 0.95%
(PIMCO Low Duration Fund) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.02%
5 Years rr_AverageAnnualReturnYear05 1.17%
10 Years rr_AverageAnnualReturnYear10 2.64%
(PIMCO Low Duration Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
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 0.46%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.71%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 73
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 227
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 395
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 883
Annual Return 2009 rr_AnnualReturn2009 13.36%
Annual Return 2010 rr_AnnualReturn2010 4.96%
Annual Return 2011 rr_AnnualReturn2011 1.71%
Annual Return 2012 rr_AnnualReturn2012 6.16%
Annual Return 2013 rr_AnnualReturn2013 0.10%
Annual Return 2014 rr_AnnualReturn2014 0.78%
Annual Return 2015 rr_AnnualReturn2015 0.67%
Annual Return 2016 rr_AnnualReturn2016 1.91%
Annual Return 2017 rr_AnnualReturn2017 1.84%
Annual Return 2018 rr_AnnualReturn2018 0.51%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2019 is 3.10%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 3.10%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 7.11% in the Q2 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 7.11%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was -1.85% in the Q2 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.85%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
1 Year rr_AverageAnnualReturnYear01 0.51%
5 Years rr_AverageAnnualReturnYear05 1.14%
10 Years rr_AverageAnnualReturnYear10 3.13%
(PIMCO Low Duration Fund) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.36%) [6]
5 Years rr_AverageAnnualReturnYear05 0.11% [6]
10 Years rr_AverageAnnualReturnYear10 2.03% [6]
(PIMCO Low Duration Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.30% [6]
5 Years rr_AverageAnnualReturnYear05 0.41% [6]
10 Years rr_AverageAnnualReturnYear10 1.99% [6]
(PIMCO Low Duration Fund) | Class I-2  
Prospectus: rr_ProspectusTable  
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 0.56%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.81%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 83
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 259
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 450
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,002
1 Year rr_AverageAnnualReturnYear01 0.41%
5 Years rr_AverageAnnualReturnYear05 1.04%
10 Years rr_AverageAnnualReturnYear10 3.03%
(PIMCO Low Duration Fund) | Class I-3  
Prospectus: rr_ProspectusTable  
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 0.66%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.91%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.86%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 285
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 499
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,115
1 Year rr_AverageAnnualReturnYear01 0.36%
5 Years rr_AverageAnnualReturnYear05 0.99%
10 Years rr_AverageAnnualReturnYear10 2.98%
(PIMCO Low Duration Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
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 0.46%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.96%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 98
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 306
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 531
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,178
1 Year rr_AverageAnnualReturnYear01 0.26%
5 Years rr_AverageAnnualReturnYear05 0.89%
10 Years rr_AverageAnnualReturnYear10 2.87%
(PIMCO Low Duration Fund) | Class A  
Prospectus: rr_ProspectusTable  
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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.00%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 325
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 536
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 765
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,422
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 325
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 536
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 765
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,422
1 Year rr_AverageAnnualReturnYear01 (2.04%)
5 Years rr_AverageAnnualReturnYear05 0.35%
10 Years rr_AverageAnnualReturnYear10 2.54%
(PIMCO Low Duration Fund) | Class C  
Prospectus: rr_ProspectusTable  
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 0.55%
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.35%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.35%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 237
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 428
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 739
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,624
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 137
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 428
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 739
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,624
1 Year rr_AverageAnnualReturnYear01 (1.11%)
5 Years rr_AverageAnnualReturnYear05 0.50%
10 Years rr_AverageAnnualReturnYear10 2.44%
(PIMCO Low Duration Fund) | Class R  
Prospectus: rr_ProspectusTable  
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 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.25% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.30%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [5]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.30%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 132
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 713
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,568
1 Year rr_AverageAnnualReturnYear01 (0.08%)
5 Years rr_AverageAnnualReturnYear05 0.55%
10 Years rr_AverageAnnualReturnYear10 2.52%
(PIMCO Low Duration Fund II)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks maximum total return, consistent with preservation of capital and prudent investment management.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Institutional Class shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): None
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):
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Example. The Example is intended to help you compare the cost of investing in Institutional Class or Administrative Class 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. Investors may pay brokerage commissions on their purchases and sales of Institutional Class shares of the Fund, which are not reflected in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
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 522% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 522.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve its investment objective by investing under normal circumstances at least 65% of its total assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. "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 from one to three years based on PIMCO's market forecasts. 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 Fund may invest only in investment grade U.S. dollar denominated securities of U.S. issuers that are rated A or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Ratings Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by PIMCO to be of comparable quality.
The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities, subject to applicable law and any other restrictions described in the Fund's prospectus or Statement of Additional Information. 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, 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 "total return" sought by the Fund consists of income earned on the Fund's investments, plus capital appreciation, if any, which generally arises from decreases in interest rates or improving credit fundamentals for a particular sector or security. The Fund may also invest up to 10% of its total assets in preferred securities.
Risk [Heading] rr_RiskHeading Principal Risks
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 duration
Call 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 features
Credit 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 obligations
Market 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 industries
Issuer 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 services
Liquidity 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 mutual funds may be higher than normal, causing increased supply in the market due to selling activity
Derivatives 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, mispricing or valuation complexity. Changes in the value of the 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. For derivatives traded on an exchange or through a central counterparty, credit risk resides with the Fund's clearing broker, or the clearinghouse itself, rather than with a counterparty in an OTC derivative transaction. 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 performance
Equity 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 securities
Mortgage-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 risk
Leveraging 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 loss
Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that 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. There is no guarantee that the investment objective of the Fund will be achieved
Short 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 Fund
Please 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 It is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
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. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
The ICE BofAML 1-3 Year U.S. Treasury Index is an unmanaged index comprised of U.S. Treasury securities, other than inflation protection securities and STRIPS, with at least $1 billion in outstanding face value and a remaining term to final maturity of at least one year and less than three years. The Lipper Short Investment Grade Debt Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest at least 65% of their assets in investment-grade debt issues (rated in the top four grades) with dollar-weighted average maturities of less than three 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.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Institutional Class*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
*The year-to-date return as of June 30, 2019 is 2.92%. For the periods shown in the bar chart, the highest quarterly return was 4.88% in the Q2 2009, and the lowest quarterly return was -1.85% in the Q2 2013.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended 12/31/18)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
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 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher 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.
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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex 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. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are for Institutional Class shares only. After-tax returns for other classes will vary.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.pimco.com/en-us/product-finder
(PIMCO Low Duration Fund II) | ICE BofAML 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.58%
5 Years rr_AverageAnnualReturnYear05 0.81%
10 Years rr_AverageAnnualReturnYear10 0.95%
(PIMCO Low Duration Fund II) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.02%
5 Years rr_AverageAnnualReturnYear05 1.17%
10 Years rr_AverageAnnualReturnYear10 2.64%
(PIMCO Low Duration Fund II) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.04% [7]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.54%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 55
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 173
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 302
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 677
Annual Return 2009 rr_AnnualReturn2009 10.27%
Annual Return 2010 rr_AnnualReturn2010 3.57%
Annual Return 2011 rr_AnnualReturn2011 2.15%
Annual Return 2012 rr_AnnualReturn2012 4.44%
Annual Return 2013 rr_AnnualReturn2013 0.04%
Annual Return 2014 rr_AnnualReturn2014 0.61%
Annual Return 2015 rr_AnnualReturn2015 0.25%
Annual Return 2016 rr_AnnualReturn2016 2.19%
Annual Return 2017 rr_AnnualReturn2017 1.66%
Annual Return 2018 rr_AnnualReturn2018 0.61%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2019 is 2.92%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.92%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 4.88% in the Q2 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.88%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was -1.85% in the Q2 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.85%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
1 Year rr_AverageAnnualReturnYear01 0.61%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 2.54%
(PIMCO Low Duration Fund II) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.27%) [6]
5 Years rr_AverageAnnualReturnYear05 0.34% [6]
10 Years rr_AverageAnnualReturnYear10 1.68% [6]
(PIMCO Low Duration Fund II) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.36% [6]
5 Years rr_AverageAnnualReturnYear05 0.49% [6]
10 Years rr_AverageAnnualReturnYear10 1.63% [6]
(PIMCO Low Duration Fund II) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.04% [7]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.79%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 81
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 252
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 439
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 978
1 Year rr_AverageAnnualReturnYear01 0.36%
5 Years rr_AverageAnnualReturnYear05 0.81%
10 Years rr_AverageAnnualReturnYear10 2.28%
(PIMCO Low Duration ESG Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks maximum total return, consistent with preservation of capital and prudent investment management.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): None
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):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2020
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Example. The Example is intended to help you compare the cost of investing in Institutional Class, I-2 or I-3 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. Investors may pay brokerage commissions on their purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund, which are not reflected in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
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 492% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 492.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve its investment objective by investing under normal circumstances at least 65% of its total assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts, or swap agreements. "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 from one to three years based on PIMCO's market forecasts. 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 Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the manufacture of alcoholic beverages, tobacco products or military equipment, the operation of gambling casinos, the production or trade of pornographic materials, or in the oil industry, including extraction, production, and refining or the production, distribution of coal and coal fired generation. The Fund can invest in the securities of any issuer determined by PIMCO to be engaged principally in biofuel production, natural gas generation and sales and trading activities. However, green/sustainable bonds from issuers involved in fossil fuel-related sectors may be permitted. Labeled green bonds are those issues with proceeds specifically earmarked to be used for climate and environmental projects. Labeled green bonds are often verified by a third party, which certifies that the bond will fund projects that include environmental benefits. In addition, the Fund will not invest in the securities of any non-governmental issuer determined by PIMCO to be engaged principally in the provision of healthcare services or the manufacture of pharmaceuticals, unless the issuer derives 100% of its gross revenues from products or services designed to protect and improve the quality of human life, as determined on the basis of information available to PIMCO. To the extent possible on the basis of information available to PIMCO, an issuer will be deemed to be principally engaged in an activity if it derives more than 10% of its gross revenues from such activities.
In analyzing whether an issuer meets any of the criteria described above, PIMCO may rely upon, among other things, information provided by an independent third party.
The Fund may avoid investment in the securities of issuers whose business practices with respect to the environment, social responsibility, and governance ("ESG practices") are not to PIMCO's satisfaction. In determining the efficacy of an issuer's ESG practices, PIMCO will use its own proprietary assessments of material ESG issues and may also reference standards as set forth by recognized global organizations such as entities sponsored by the United Nations. Additionally, PIMCO may engage proactively with issuers to encourage them to improve their ESG practices. PIMCO's activities in this respect may include, but are not limited to, direct dialogue with company management, such as through in-person meetings, phone calls, electronic communications, and letters. Through these engagement activities, PIMCO seeks to identify opportunities for a company to improve its ESG practices, and will endeavor to work collaboratively with company management to establish concrete objectives and to develop a plan for meeting these objectives. The Fund may invest in securities of issuers whose ESG practices are currently suboptimal, with the expectation that these practices may improve over time either as a result of PIMCO's engagement efforts or through the company's own initiatives. It may also exclude those issuers that are not receptive to PIMCO's engagement efforts, as determined in PIMCO's sole discretion.
The Fund invests primarily in investment grade securities, but may invest up to 10% of its total assets in 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. The Fund may invest up to 30% of its total assets in securities denominated in foreign currencies, and may invest beyond this limit in U.S. dollar-denominated securities of foreign issuers. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 20% of its total assets. The Fund may invest up to 10% of its total assets in securities and instruments that are economically tied to emerging market countries (this limitation does not apply to investment grade sovereign debt denominated in the local currency with less than 1 year remaining to maturity, which means the Fund may invest, together with any other investments denominated in foreign currencies, up to 30% of its total assets in such instruments).
The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities, subject to applicable law and any other restrictions described in the Fund's prospectus or Statement of Additional Information. 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, 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 "total return" sought by the Fund consists of income earned on the Fund's investments, plus capital appreciation, if any, which generally arises from decreases in interest rates, foreign currency appreciation, or improving credit fundamentals for a particular sector or security. The Fund may also invest up to 10% of its total assets in preferred securities.
Risk [Heading] rr_RiskHeading Principal Risks
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 duration
Call 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 features
Credit 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 obligations
High 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 maturity
Market 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 industries
Issuer 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 services
Liquidity 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 mutual funds may be higher than normal, causing increased supply in the market due to selling activity
Derivatives 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, mispricing or valuation complexity. Changes in the value of the 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. For derivatives traded on an exchange or through a central counterparty, credit risk resides with the Fund's clearing broker, or the clearinghouse itself, rather than with a counterparty in an OTC derivative transaction. 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 performance
Equity 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 securities
Mortgage-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 risk
Foreign (Non-U.S.) Investment Risk: the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, increased risk of delayed settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers
Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk
Sovereign Debt Risk: the risk that investments in fixed income instruments issued by sovereign entities may decline in value as a result of default or other adverse credit event resulting from an issuer's inability or unwillingness to make principal or interest payments in a timely fashion
Currency Risk: the risk that foreign (non-U.S.) currencies will change in value relative to the U.S. dollar and affect the Fund's investments in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign (non-U.S.) currencies
Leveraging 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 loss
Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that 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. There is no guarantee that the investment objective of the Fund will be achieved
Short 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 Fund
Responsible Investing Risk: the risk that, because the Fund's responsible investment strategy may select or exclude securities of certain issuers for reasons other than performance, the Fund may underperform funds that do not utilize a responsible investment strategy. Responsible investing is qualitative and subjective by nature, and there is no guarantee that the criteria utilized by PIMCO or any judgment exercised by PIMCO will reflect the beliefs or values of any particular investor
Please 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 It is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
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. For periods prior to the inception date of I-2 shares (November 19, 2010), performance information shown in the table for that class is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by that class of shares. The I-3 shares of the Fund have not commenced operations as of the date of this prospectus. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
The ICE BofAML 1-3 Year U.S. Treasury Index is an unmanaged index comprised of U.S. Treasury securities, other than inflation-protection securities and STRIPS, with at least $1 billion in outstanding face value and a remaining term to final maturity of at least one year and less than three years. The Lipper Short Investment Grade Debt Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest at least 65% of their assets in investment-grade debt issues (rated in the top four grades) with dollar-weighted average maturities of less than three 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.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Institutional Class*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
*The year-to-date return as of June 30, 2019 is 2.96%. For the periods shown in the bar chart, the highest quarterly return was 6.92% in the Q2 2009, and the lowest quarterly return was -2.01% in the Q2 2013.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended 12/31/18)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
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 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher 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.
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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex 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. For periods prior to the inception date of I-2 shares (November 19, 2010), performance information shown in the table for that class is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by that class of shares. The I-3 shares of the Fund have not commenced operations as of the date of this prospectus. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are for Institutional Class shares only. After-tax returns for other classes will vary.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.pimco.com/en-us/product-finder
(PIMCO Low Duration ESG Fund) | ICE BofAML 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.58%
5 Years rr_AverageAnnualReturnYear05 0.81%
10 Years rr_AverageAnnualReturnYear10 0.95%
(PIMCO Low Duration ESG Fund) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.02%
5 Years rr_AverageAnnualReturnYear05 1.17%
10 Years rr_AverageAnnualReturnYear10 2.64%
(PIMCO Low Duration ESG Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.02% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.52%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.52%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 53
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 167
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 291
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 653
Annual Return 2009 rr_AnnualReturn2009 11.62%
Annual Return 2010 rr_AnnualReturn2010 5.38%
Annual Return 2011 rr_AnnualReturn2011 2.38%
Annual Return 2012 rr_AnnualReturn2012 6.00%
Annual Return 2013 rr_AnnualReturn2013 0.24%
Annual Return 2014 rr_AnnualReturn2014 0.82%
Annual Return 2015 rr_AnnualReturn2015 0.65%
Annual Return 2016 rr_AnnualReturn2016 1.51%
Annual Return 2017 rr_AnnualReturn2017 1.69%
Annual Return 2018 rr_AnnualReturn2018 0.31%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2019 is 2.96%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 2.96%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 6.92% in the Q2 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 6.92%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was -2.01% in the Q2 2013
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (2.01%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Jun. 30, 2013
1 Year rr_AverageAnnualReturnYear01 0.31%
5 Years rr_AverageAnnualReturnYear05 1.00%
10 Years rr_AverageAnnualReturnYear10 3.00%
(PIMCO Low Duration ESG Fund) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.46%) [6]
5 Years rr_AverageAnnualReturnYear05 0.16% [6]
10 Years rr_AverageAnnualReturnYear10 2.05% [6]
(PIMCO Low Duration ESG Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.18% [6]
5 Years rr_AverageAnnualReturnYear05 0.38% [6]
10 Years rr_AverageAnnualReturnYear10 1.96% [6]
(PIMCO Low Duration ESG Fund) | Class I-2  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.02% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.62%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.62%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 63
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 199
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 346
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 774
1 Year rr_AverageAnnualReturnYear01 0.21%
5 Years rr_AverageAnnualReturnYear05 0.89%
10 Years rr_AverageAnnualReturnYear10 2.90%
(PIMCO Low Duration ESG Fund) | Class I-3  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.70%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.02% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.72%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.67%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 68
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 225
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 396
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 890
(PIMCO Short Asset Investment Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks maximum current income, consistent with daily liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund. 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 33 of the Fund's prospectus, Appendix B to the Fund's prospectus (Financial Firm-Specific Sales Charge Waivers and Discounts) or from your financial advisor.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment): None [10]
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):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2020
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Example. The Example is intended to help you compare the cost of investing in Institutional Class, I-2, I-3, Class M, Administrative Class or Class A 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. Investors may pay brokerage commissions on their purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund, which are not reflected in the Example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
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 110% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 110.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve its investment objective by investing under normal circumstances at least 65% of its total assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. "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 will vary based on PIMCO's market forecasts and will normally not exceed one and one-half 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 Fund invests primarily in investment grade debt securities rated Baa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Ratings Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by PIMCO to be of comparable quality. The Fund may not invest in securities denominated in foreign currencies, but may invest without limit in U.S. dollar-denominated securities of foreign issuers. In addition, the Fund may invest up to 10% of its total assets in U.S. dollar-denominated securities and instruments that are economically tied to emerging market countries. The Fund may invest up to 60% of its total assets in corporate issuers.
The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, subject to applicable law and any other restrictions described in the Fund's prospectus or Statement of Additional Information. The Fund may invest up to 20% of its total assets in asset-backed securities and up to 10% of its total assets in privately issued mortgage-backed securities. The Fund may invest up to 10% of its total assets in interest rate swaps and up to 5% of its total assets in credit default swaps. 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, 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).
Risk [Heading] rr_RiskHeading Principal Risks
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 duration
Call 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 features
Credit 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 obligations
Market 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 industries
Issuer 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 services
Liquidity 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 mutual funds may be higher than normal, causing increased supply in the market due to selling activity
Derivatives 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, mispricing or valuation complexity. Changes in the value of the 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. For derivatives traded on an exchange or through a central counterparty, credit risk resides with the Fund's clearing broker, or the clearinghouse itself, rather than with a counterparty in an OTC derivative transaction. 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 performance
Mortgage-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 risk
Foreign (Non-U.S.) Investment Risk: the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, increased risk of delayed settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers
Emerging Markets Risk: the risk of investing in emerging market securities, primarily increased foreign (non-U.S.) investment risk
Leveraging 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 loss
Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that 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. There is no guarantee that the investment objective of the Fund will be achieved
Short 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 Fund
Please 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 It is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
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. For periods prior to the inception date of Class M shares (December 21, 2015) and I-3 shares (April 27, 2018), performance information shown in the table for these classes is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by these classes of shares. Performance for Class A shares in the Average Annual Total Returns table reflects the impact of sales charges. To obtain the Fund's current yield, call 888.87.PIMCO. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
The Fund's benchmark index is the FTSE 3-Month Treasury Bill Index. The index is an unmanaged index representing monthly return equivalents of yield averages of the last 3-month Treasury Bill issues. The Lipper Ultra-Short Obligation Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest at least 65% of their assets in investment-grade debt issues or better, and maintain a portfolio dollar-weighted average maturity between 91 and 365 days. It does not reflect deductions for fees, expenses or taxes.
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.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Institutional Class*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
*The year-to-date return as of June 30, 2019 is 1.40%. For the periods shown in the bar chart, the highest quarterly return was 0.79% in the Q3 2018, and the lowest quarterly return was -0.12% in the Q4 2014.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended 12/31/18)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
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 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher 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.
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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex 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. For periods prior to the inception date of Class M shares (December 21, 2015) and I-3 shares (April 27, 2018), performance information shown in the table for these classes is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by these classes of shares. Performance for Class A shares in the Average Annual Total Returns table reflects the impact of sales charges. To obtain the Fund's current yield, call 888.87.PIMCO. The Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are for Institutional Class shares only. After-tax returns for other classes will vary.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.pimco.com/en-us/product-finder
(PIMCO Short Asset Investment Fund) | FTSE 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.86%
5 Years rr_AverageAnnualReturnYear05 0.60%
Since Inception rr_AverageAnnualReturnSinceInception 0.47%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Lipper Ultra-Short Obligation Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.59%
5 Years rr_AverageAnnualReturnYear05 0.91%
Since Inception rr_AverageAnnualReturnSinceInception 0.87%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.34%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.04% [11]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.38%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 122
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 213
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 480
Annual Return 2013 rr_AnnualReturn2013 0.72%
Annual Return 2014 rr_AnnualReturn2014 0.59%
Annual Return 2015 rr_AnnualReturn2015 0.68%
Annual Return 2016 rr_AnnualReturn2016 1.73%
Annual Return 2017 rr_AnnualReturn2017 1.92%
Annual Return 2018 rr_AnnualReturn2018 1.98%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2019 is 1.40%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.40%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 0.79% in the Q3 2018
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.79%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2018
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was -0.12% in the Q4 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (0.12%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2014
1 Year rr_AverageAnnualReturnYear01 1.98%
5 Years rr_AverageAnnualReturnYear05 1.38%
Since Inception rr_AverageAnnualReturnSinceInception 1.40%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.01% [12]
5 Years rr_AverageAnnualReturnYear05 0.74% [12]
Since Inception rr_AverageAnnualReturnSinceInception 0.81% [12]
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012 [12]
(PIMCO Short Asset Investment Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.17% [12]
5 Years rr_AverageAnnualReturnYear05 0.77% [12]
Since Inception rr_AverageAnnualReturnSinceInception 0.81% [12]
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012 [12]
(PIMCO Short Asset Investment Fund) | Class I-2  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.04% [11]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.48%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.48%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 49
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 154
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 269
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 604
1 Year rr_AverageAnnualReturnYear01 1.88%
5 Years rr_AverageAnnualReturnYear05 1.28%
Since Inception rr_AverageAnnualReturnSinceInception 1.29%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Class I-3  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.54%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.04% [11]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.58%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.53%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 54
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 181
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 319
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 721
1 Year rr_AverageAnnualReturnYear01 1.83%
5 Years rr_AverageAnnualReturnYear05 1.21%
Since Inception rr_AverageAnnualReturnSinceInception 1.22%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Class M  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.34%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.04% [11]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.38%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.38%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 39
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 122
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 213
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 480
1 Year rr_AverageAnnualReturnYear01 1.99%
5 Years rr_AverageAnnualReturnYear05 1.38%
Since Inception rr_AverageAnnualReturnSinceInception 1.40%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.34%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.04% [11]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 64
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 351
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 786
1 Year rr_AverageAnnualReturnYear01 1.69%
5 Years rr_AverageAnnualReturnYear05 1.11%
Since Inception rr_AverageAnnualReturnSinceInception 1.14%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.04% [11]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.73%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.73%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 75
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 233
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 406
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 906
1 Year rr_AverageAnnualReturnYear01 (0.65%)
5 Years rr_AverageAnnualReturnYear05 0.57%
Since Inception rr_AverageAnnualReturnSinceInception 0.69%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short-Term Fund)  
Prospectus: rr_ProspectusTable  
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
The Fund seeks maximum current income, consistent with preservation of capital and daily liquidity.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
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. In addition to the fees and expenses described below, you may also be required to pay brokerage commissions on purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund. 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 33 of the Fund's prospectus, Appendix B to the Fund's prospectus (Financial Firm-Specific Sales Charge Waivers and Discounts) or from your financial advisor.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts 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.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 100,000
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption 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 of the value of your investment):
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2020
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
Example. The Example is intended to help you compare the cost of investing in Institutional Class, I-2, I-3, Administrative Class, Class A, Class C or Class R 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. Investors may pay brokerage commissions on their purchases and sales of Institutional Class, I-2 or I-3 shares of the Fund, which are not reflected in the Example. 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 If you redeem your shares at the end of each period:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If you do not redeem your shares:
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
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 104% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 104.00%
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund seeks to achieve its investment objective by investing under normal circumstances at least 65% of its total assets in a diversified portfolio of Fixed Income Instruments of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. "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 will vary based on PIMCO's market forecasts and will normally not exceed one year. 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. In addition, the dollar-weighted average portfolio maturity of the Fund, under normal circumstances, is expected not to exceed three years.
The Fund invests primarily in investment grade debt securities, but may invest up to 10% of its total assets in high yield securities ("junk bonds") rated B or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Ratings Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by PIMCO to be of comparable quality. The Fund may invest up to 10% of its total assets in securities denominated in foreign currencies, and may invest beyond this limit in U.S. dollar-denominated securities of foreign issuers. The Fund will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 20% of its total assets.
The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts or swap agreements, or in mortgage- or asset-backed securities, subject to applicable law and any other restrictions described in the Fund's prospectus or Statement of Additional Information. 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, 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 Principal Risks
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 duration
Call 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 features
Credit 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 obligations
High 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 maturity
Market 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 industries
Issuer 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 services
Liquidity 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 mutual funds may be higher than normal, causing increased supply in the market due to selling activity
Derivatives 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, mispricing or valuation complexity. Changes in the value of the 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. For derivatives traded on an exchange or through a central counterparty, credit risk resides with the Fund's clearing broker, or the clearinghouse itself, rather than with a counterparty in an OTC derivative transaction. 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 performance
Equity 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 securities
Mortgage-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 risk
Foreign (Non-U.S.) Investment Risk: the risk that investing in foreign (non-U.S.) securities may result in the Fund experiencing more rapid and extreme changes in value than a fund that invests exclusively in securities of U.S. companies, due to smaller markets, differing reporting, accounting and auditing standards, increased risk of delayed settlement of portfolio transactions or loss of certificates of portfolio securities, and the risk of unfavorable foreign government actions, including nationalization, expropriation or confiscatory taxation, currency blockage, or political changes or diplomatic developments. Foreign securities may also be less liquid and more difficult to value than securities of U.S. issuers
Currency Risk: the risk that foreign (non-U.S.) currencies will change in value relative to the U.S. dollar and affect the Fund's investments in foreign (non-U.S.) currencies or in securities that trade in, and receive revenues in, or in derivatives that provide exposure to, foreign (non-U.S.) currencies
Leveraging 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 loss
Management Risk: the risk that the investment techniques and risk analyses applied by PIMCO will not produce the desired results and that 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. There is no guarantee that the investment objective of the Fund will be achieved
Short 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 Fund
Please 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 It is possible to lose money on an investment in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution 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.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
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. For periods prior to the inception date of I-3 shares (April 27, 2018), performance information shown in the table for that class is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by that class of 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 FTSE 3-Month Treasury Bill Index is an unmanaged index representing monthly return equivalents of yield averages of the last 3 month Treasury Bill issues. The Lipper Ultra-Short Obligation Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest at least 65% of their assets in investment-grade debt issues or better, and maintain a portfolio dollar-weighted average maturity between 91 and 365 days.
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.
Bar Chart [Heading] rr_BarChartHeading Calendar Year Total Returns — Institutional Class*
Bar Chart Footnotes [Text Block] rr_BarChartFootnotesTextBlock
*The year-to-date return as of June 30, 2019 is 1.55%. For the periods shown in the bar chart, the highest quarterly return was 3.61% in the Q2 2009, and the lowest quarterly return was -1.00% in the Q3 2011.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for periods ended 12/31/18)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate 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.
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 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.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher 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.
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.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex 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. For periods prior to the inception date of I-3 shares (April 27, 2018), performance information shown in the table for that class is based on the performance of the Fund's Institutional Class shares, adjusted to reflect the fees and expenses paid by that class of 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.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are for Institutional Class shares only. After-tax returns for other classes will vary.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress https://www.pimco.com/en-us/product-finder
(PIMCO Short-Term Fund) | FTSE 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.86%
5 Years rr_AverageAnnualReturnYear05 0.60%
10 Years rr_AverageAnnualReturnYear10 0.35%
(PIMCO Short-Term Fund) | Lipper Ultra-Short Obligation Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 1.59%
5 Years rr_AverageAnnualReturnYear05 0.91%
10 Years rr_AverageAnnualReturnYear10 1.34%
(PIMCO Short-Term Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
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
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.50%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.50%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 51
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 160
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 280
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 628
Annual Return 2009 rr_AnnualReturn2009 9.44%
Annual Return 2010 rr_AnnualReturn2010 1.93%
Annual Return 2011 rr_AnnualReturn2011 0.35%
Annual Return 2012 rr_AnnualReturn2012 3.44%
Annual Return 2013 rr_AnnualReturn2013 0.84%
Annual Return 2014 rr_AnnualReturn2014 0.97%
Annual Return 2015 rr_AnnualReturn2015 1.37%
Annual Return 2016 rr_AnnualReturn2016 2.57%
Annual Return 2017 rr_AnnualReturn2017 2.43%
Annual Return 2018 rr_AnnualReturn2018 1.51%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2019 is 1.55%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.55%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 3.61% in the Q2 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 3.61%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was -1.00% in the Q3 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.00%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
1 Year rr_AverageAnnualReturnYear01 1.51%
5 Years rr_AverageAnnualReturnYear05 1.77%
10 Years rr_AverageAnnualReturnYear10 2.46%
(PIMCO Short-Term Fund) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.44% [6]
5 Years rr_AverageAnnualReturnYear05 0.94% [6]
10 Years rr_AverageAnnualReturnYear10 1.73% [6]
(PIMCO Short-Term Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.90% [6]
5 Years rr_AverageAnnualReturnYear05 0.98% [6]
10 Years rr_AverageAnnualReturnYear10 1.61% [6]
(PIMCO Short-Term Fund) | Class I-2  
Prospectus: rr_ProspectusTable  
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
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.60%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.60%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 61
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 192
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 335
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 750
1 Year rr_AverageAnnualReturnYear01 1.40%
5 Years rr_AverageAnnualReturnYear05 1.67%
10 Years rr_AverageAnnualReturnYear10 2.35%
(PIMCO Short-Term Fund) | Class I-3  
Prospectus: rr_ProspectusTable  
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 0.65%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.70%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.65%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 66
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 219
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 385
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 866
1 Year rr_AverageAnnualReturnYear01 1.36%
5 Years rr_AverageAnnualReturnYear05 1.62%
10 Years rr_AverageAnnualReturnYear10 2.30%
(PIMCO Short-Term Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
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 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 77
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 240
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 417
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 930
1 Year rr_AverageAnnualReturnYear01 1.25%
5 Years rr_AverageAnnualReturnYear05 1.51%
10 Years rr_AverageAnnualReturnYear10 2.20%
(PIMCO Short-Term Fund) | Class A  
Prospectus: rr_ProspectusTable  
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 0.45%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.75%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 300
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 459
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 633
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,134
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 300
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 459
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 633
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,134
1 Year rr_AverageAnnualReturnYear01 (1.03%)
5 Years rr_AverageAnnualReturnYear05 1.05%
10 Years rr_AverageAnnualReturnYear10 1.94%
(PIMCO Short-Term Fund) | Class C  
Prospectus: rr_ProspectusTable  
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 0.45%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.55%
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 207
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 334
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 579
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,283
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 107
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 334
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 579
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,283
1 Year rr_AverageAnnualReturnYear01 (0.04%)
5 Years rr_AverageAnnualReturnYear05 1.21%
10 Years rr_AverageAnnualReturnYear10 1.87%
(PIMCO Short-Term Fund) | Class R  
Prospectus: rr_ProspectusTable  
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 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.05% [13]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.00%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets [9]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 318
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 552
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,225
1 Year rr_AverageAnnualReturnYear01 1.00%
5 Years rr_AverageAnnualReturnYear05 1.26%
10 Years rr_AverageAnnualReturnYear10 1.92%
[1] Regular sales charges may apply when Class A shares of the Fund (on which no sales charge was paid at the time of purchase) are exchanged for shares of other funds offered by the Trust.
[2] The Lipper Average's since inception return is determined from the nearest month-end following the Fund's inception date and not from the actual inception date of the Fund.
[3] To maintain certain net yields for the Fund, Pacific Investment Management Company LLC ("PIMCO") or its affiliates may temporarily and voluntarily waive, reduce or reimburse all or any portion of the Fund's fees and expenses. Such waivers, if any, are not reflected in this table. See "Management of the Funds—Temporary Fee Waivers, Reductions and Reimbursements" in the Fund's prospectus for additional information.
[4] "Other Expenses" include interest expense of 0.25%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC ("PIMCO"). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.46%, 0.56%, 0.61%, 0.71%, 0.75%, 1.10% and 1.05% for Institutional Class, I-2, I-3, Administrative Class, Class A, Class C and Class R shares, respectively.
[5] PIMCO has contractually agreed, through July 31, 2020, to reduce its supervisory and administrative fee for the Fund's I-3 shares by 0.05% of the average daily net assets attributable to I-3 shares of the Fund. This Fee Waiver Agreement renews annually unless terminated by PIMCO upon at least 30 days' prior notice to the end of the contract term.
[6] 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.
[7] "Other Expenses" include interest expense of 0.04%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC ("PIMCO"). Excluding interest expense, Total Annual Fund Operating Expenses are 0.50% and 0.75% for Institutional Class and Administrative Class shares, respectively.
[8] "Other Expenses" include interest expense of 0.02%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC ("PIMCO"). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.50%, 0.60% and 0.65% for Institutional Class, I-2 and I-3 shares, respectively.
[9] PIMCO has contractually agreed, through July 31, 2020, to reduce its supervisory and administrative fee for the Fund's I-3 shares by 0.05% of the average daily net assets attributable to I-3 shares of the Fund. This Fee Waiver Agreement renews annually unless terminated by PIMCO upon at least 30 days' prior notice to the end of the contract term.
[10] Regular sales charges may apply when Class A shares of the Fund (on which no sales charge was paid at the time of purchase) are exchanged for shares of other funds offered by the Trust.
[11] "Other Expenses" include interest expense of 0.04%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC ("PIMCO"). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.34%, 0.44%, 0.49%, 0.34%, 0.59% and 0.69% for Institutional Class, I-2, I-3, Class M, Administrative Class and Class A shares, respectively.
[12] 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.
[13] "Other Expenses" include interest expense of 0.05%. Interest expense is borne by the Fund separately from the management fees paid to Pacific Investment Management Company LLC ("PIMCO"). Excluding interest expense, Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement are 0.45%, 0.55%, 0.60%, 0.70%, 0.70%, 1.00% and 0.95% for Institutional Class, I-2, I-3, Administrative Class, Class A, Class C and Class R shares, respectively.