rr_ObjectiveHeading

Investment Objective

rr_ExpenseHeading

Fees and Expenses of the Fund

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from 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, Class P 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 shares or Class P 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, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

If you do not redeem your shares:

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 93% of the average value of its portfolio.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money on an investment in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns — Institutional Class*

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/16)

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 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 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 P shares (September 11, 2008), 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 actual distribution and/or service (12b-1) fees and other expenses paid by that class of shares. The Class A 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 Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily updates on the net asset value and performance page at http://investments.pimco.com/DailyPerformance and quarterly updates at http://investments.pimco.com/QuarterlyPerformance.

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

3.14%

1 Year

rr_AverageAnnualReturnYear01

5.87%

10 Years

rr_AverageAnnualReturnYear10

5.06%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.68%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

218

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 847

Annual Return 2008

rr_AnnualReturn2008

49.19%

Annual Return 2010

rr_AnnualReturn2010

12.85%

Annual Return 2012

rr_AnnualReturn2012

2.89%

Annual Return 2014

rr_AnnualReturn2014

45.37%

Annual Return 2016

rr_AnnualReturn2016

1.67%

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

8.77%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

the highest quarterly return was 52.32% in the Q3 2011

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2011

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(17.41%)

1 Year

rr_AverageAnnualReturnYear01

1.67%

10 Years

rr_AverageAnnualReturnYear10

9.14%

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

(0.62%)

^[2]

1 Year

rr_AverageAnnualReturnYear01

1.31%

^[2]

10 Years

rr_AverageAnnualReturnYear10

5.68%

^[2]

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.78%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

249

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 966

5 Years

rr_AverageAnnualReturnYear05

2.71%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.75%

Management Fees

rr_ManagementFeesOverAssets

0.65%

Other Expenses

rr_OtherExpensesOverAssets

0.18%

^[1]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 481

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

948

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

481

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

948

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Expense [Heading]

rr_ExpenseHeading

Fees and Expenses of the Fund

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.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from 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, Class P, Class D, 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 Class P 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, No Redemption, By Year, Caption [Text]

rr_ExpenseExampleNoRedemptionByYearCaption

If you do not redeem your shares:

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 1,536% of the average value of its portfolio.

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Lose Money [Text]

rr_RiskLoseMoney

It is possible to lose money on an investment in the Fund.

Bar Chart and Performance Table [Heading]

rr_BarChartAndPerformanceTableHeading

Performance Information

Bar Chart [Heading]

rr_BarChartHeading

Calendar Year Total Returns — Institutional Class*

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/16)

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 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 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 P shares (April 30, 2008), 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 actual distribution and/or service (12b-1) fees and other 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 Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily updates on the net asset value and performance page at http://investments.pimco.com/DailyPerformance and quarterly updates at http://investments.pimco.com/QuarterlyPerformance.

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

1.81%

1 Year

rr_AverageAnnualReturnYear01

1.05%

10 Years

rr_AverageAnnualReturnYear10

3.94%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.51%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

164

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 640

Annual Return 2008

rr_AnnualReturn2008

5.29%

Annual Return 2010

rr_AnnualReturn2010

7.96%

Annual Return 2012

rr_AnnualReturn2012

3.01%

Annual Return 2014

rr_AnnualReturn2014

6.01%

Annual Return 2016

rr_AnnualReturn2016

1.82%

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

1.11%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

the highest quarterly return was 3.78% in the Q2 2010

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2010

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(2.70%)

1 Year

rr_AverageAnnualReturnYear01

1.82%

10 Years

rr_AverageAnnualReturnYear10

4.80%

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

0.68%

^[2]

1 Year

rr_AverageAnnualReturnYear01

1.03%

^[2]

10 Years

rr_AverageAnnualReturnYear10

3.06%

^[2]

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.61%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

195

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 762

5 Years

rr_AverageAnnualReturnYear05

1.82%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.65%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

^[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 93

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

504

1 Year

rr_AverageAnnualReturnYear01

1.42%

10 Years

rr_AverageAnnualReturnYear10

4.39%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.91%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

654

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,453

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

654

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,453

5 Years

rr_AverageAnnualReturnYear05

0.74%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.65%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

^[3]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 269

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

902

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

169

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

902

1 Year

rr_AverageAnnualReturnYear01

(0.33%)

10 Years

rr_AverageAnnualReturnYear10

3.61%

Prospectus:

rr_ProspectusTable

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks maximum total return, consistent with preservation of capital and prudent investment management.

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. 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 63 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, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 100,000

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 by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

If you redeem your shares at the end of each period:

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

133.00%

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 diversified portfolio of investment grade corporate fixed income securities of varying maturities, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Assets not invested in investment grade corporate fixed income securities may be invested in other types of Fixed Income Instruments. "Fixed Income Instruments" include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private-sector entities. The average portfolio duration of this Fund normally varies within two years (plus or minus) of the portfolio duration of the securities comprising the Bloomberg Barclays U.S. Credit Index, as calculated by PIMCO, which as of May 31, 2017 was 6.87 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, but may invest up to 15% 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 (except that within such 15% limitation, the Fund may invest in mortgage-related securities rated below B). Investment grade debt securities are rated Baa or higher by Moody's, or equivalently rated by S&P or Fitch, or, if unrated, determined by PIMCO to be of comparable quality. 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 may invest up to 25% 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 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 "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 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 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 securities 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 decline 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 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.

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 P shares (April 30, 2008), 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 actual distribution and/or service (12b-1) fees and other 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 Bloomberg Barclays U.S. Credit Index is an unmanaged index comprised of publicly issued U.S. corporate and specified non-U.S. debentures and secured notes that meet the specified maturity, liquidity, and quality requirements. To qualify, bonds must be SEC-registered. The Lipper Corporate Debt Funds BBB-Rated 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 five to ten years.

Performance for the Fund is updated daily and quarterly and may be obtained as follows: daily updates on the net asset value and performance page at http://investments.pimco.com/DailyPerformance and quarterly updates at http://investments.pimco.com/QuarterlyPerformance.

Bar Chart Footnotes [Text Block]

rr_BarChartFootnotesTextBlock

*The year-to-date return as of June 30, 2017 is 5.17%. For the periods shown in the bar chart, the highest quarterly return was 9.18% in the Q2 2009, and the lowest quarterly return was -5.26% in the Q3 2008.

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 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 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 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.

1 Year

rr_AverageAnnualReturnYear01

5.63%

10 Years

rr_AverageAnnualReturnYear10

5.31%

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

3.81%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 52

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

285

Annual Return 2007

rr_AnnualReturn2007

7.15%

Annual Return 2009

rr_AnnualReturn2009

18.74%

Annual Return 2011

rr_AnnualReturn2011

6.86%

Annual Return 2013

rr_AnnualReturn2013

(1.69%)

Annual Return 2015

rr_AnnualReturn2015

0.28%

Year to Date Return, Label

rr_YearToDateReturnLabel

The year-to-date return as of June 30, 2017 is 5.17%.

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Jun. 30, 2017

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.18%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

the lowest quarterly return was -5.26% in the Q3 2008

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Sep. 30, 2008

5 Years

rr_AverageAnnualReturnYear05

5.70%

1 Year

rr_AverageAnnualReturnYear01

5.21%

^[2]

10 Years

rr_AverageAnnualReturnYear10

4.78%

^[2]

Prospectus:

rr_ProspectusTable

5 Years

rr_AverageAnnualReturnYear05

3.47%

^[2]

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.60%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 62

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

340

1 Year

rr_AverageAnnualReturnYear01

6.88%

10 Years

rr_AverageAnnualReturnYear10

7.29%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

none

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.76%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

243

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

$ 942

5 Years

rr_AverageAnnualReturnYear05

5.43%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.65%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 93

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

504

1 Year

rr_AverageAnnualReturnYear01

6.57%

10 Years

rr_AverageAnnualReturnYear10

6.97%

Prospectus:

rr_ProspectusTable

Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)

rr_MaximumDeferredSalesChargeOverOther

1.00%

Distribution and/or Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.91%

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

654

Expense Example, with Redemption, 10 Years

rr_ExpenseExampleYear10

1,453

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

654

Expense Example, No Redemption, 10 Years

rr_ExpenseExampleNoRedemptionYear10

$ 1,453

5 Years

rr_AverageAnnualReturnYear05

4.48%

Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Management Fees

rr_ManagementFeesOverAssets

0.65%

Other Expenses

rr_OtherExpensesOverAssets

0.01%

^[4]

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

$ 269

Expense Example, with Redemption, 5 Years

rr_ExpenseExampleYear05

902

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

169

Expense Example, No Redemption, 5 Years

rr_ExpenseExampleNoRedemptionYear05

902

1 Year

rr_AverageAnnualReturnYear01

4.77%

10 Years

rr_AverageAnnualReturnYear10

6.18%

Prospectus:

rr_ProspectusTable

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks maximum total return, consistent with prudent investment management.

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. 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 63 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, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 100,000

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 by, Year, Caption [Text]

rr_ExpenseExampleByYearCaption

If you redeem your shares at the end of each period:

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

116.00%

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 within two years (plus or minus) of the portfolio duration of the securities comprising the Bloomberg Barclays Long Term Government/Credit Index, as calculated by PIMCO, which as of May 31, 2017 was 14.77 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, but may invest up to 10% of its total assets in high yield securities ("junk bonds") that are 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 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 may invest up to 15% 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 will normally limit its foreign currency exposure (from non-U.S. dollar-denominated securities or currencies) to 20% of its total assets.