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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:
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, Class M, Class P, Administrative Class, Class D, 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. 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:

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 may invest in the following: 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 repurchase agreements secured by such obligations. 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 sell 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:

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

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 Class P shares (May 14, 2009), 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 actual distribution and/or service (12b-1) fees and other expenses paid by these classes of shares. The Institutional Class, Administrative Class, Class D and Class R of the Fund have not commenced operations as of the date of this prospectus. Performance for Class A and Class C 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 Citi 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 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 [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, 2015 is 0.00%. For the periods shown in the bar chart, the highest quarterly return was 0.02% in the Q4 2012, and the lowest quarterly return was 0.00% in the Q3 2013.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

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 Class P shares (May 14, 2009), 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 actual distribution and/or service (12b-1) fees and other expenses paid by these classes of shares. The Institutional Class, Administrative Class, Class D and Class R of the Fund have not commenced operations as of the date of this prospectus. Performance for Class A and Class C 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 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.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 888.87.PIMCO
(PIMCO Government Money Market Fund) | Citi 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.03%
5 Years rr_AverageAnnualReturnYear05 0.07%
Since Inception rr_AverageAnnualReturnSinceInception 0.09%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Lipper Institutional U.S. Government Money Markets Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 0.02%
Since Inception rr_AverageAnnualReturnSinceInception 0.03%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 58
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 101
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 230
(PIMCO Government Money Market Fund) | Class M  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 58
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 101
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 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%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 0.00%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn none
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 0.02% in the Q4 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.02%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2012
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 0.02%
5 Years rr_AverageAnnualReturnYear05 0.03%
Since Inception rr_AverageAnnualReturnSinceInception 0.07%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class P  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.28%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.28% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 29
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 90
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 157
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 356
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.03%
Since Inception rr_AverageAnnualReturnSinceInception 0.05%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 58
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 101
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 230
(PIMCO Government Money Market Fund) | Class D  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.18% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 58
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 101
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 230
(PIMCO Government Money Market Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.33% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 34
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 106
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 185
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 418
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.02%
Since Inception rr_AverageAnnualReturnSinceInception 0.04%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.33% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 34
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 106
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 185
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 418
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.02%
Since Inception rr_AverageAnnualReturnSinceInception 0.04%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 27, 2009
(PIMCO Government Money Market Fund) | Class R  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.33% [2]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 34
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 106
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 185
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 418
(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. 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 35 of the Fund's prospectus 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):

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, Administrative Class, Class D, 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. 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 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 normally varies from one to three years based on Pacific Investment Management Company LLC's ("PIMCO") forecast for interest rates. 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") 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 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 stocks.

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:

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 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 derivatives are also subject to the risk that the other party in the transaction will not fulfill its contractual obligations. For derivatives traded on exchanges, the primary credit risk is the creditworthiness of the Fund's clearing broker or the exchange itself

Equity Risk: the risk that the value of equity securities, such as common stocks and preferred stocks, 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 the 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 Sale 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 may fail to honor its contract terms, 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 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 BofA Merrill Lynch 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 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 [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, 2015 is 0.80%. 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 -3.79% in the Q3 2008.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

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 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 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 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.
(PIMCO Low Duration Fund) | BofA Merrill Lynch 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.62%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 2.54%
(PIMCO Low Duration Fund) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.75%
5 Years rr_AverageAnnualReturnYear05 2.16%
10 Years rr_AverageAnnualReturnYear10 2.70%
(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
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.46%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 579
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 47
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 148
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 258
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 579
Annual Return 2005 rr_AnnualReturn2005 1.55%
Annual Return 2006 rr_AnnualReturn2006 3.75%
Annual Return 2007 rr_AnnualReturn2007 7.92%
Annual Return 2008 rr_AnnualReturn2008 (1.28%)
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%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 0.80%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.80%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
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 -3.79% in the Q3 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.79%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
1 Year rr_AverageAnnualReturnYear01 0.78%
5 Years rr_AverageAnnualReturnYear05 2.72%
10 Years rr_AverageAnnualReturnYear10 3.82%
(PIMCO Low Duration Fund) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.79%) [3]
5 Years rr_AverageAnnualReturnYear05 1.52% [3]
10 Years rr_AverageAnnualReturnYear10 2.40% [3]
(PIMCO Low Duration Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.44% [3]
5 Years rr_AverageAnnualReturnYear05 1.64% [3]
10 Years rr_AverageAnnualReturnYear10 2.43% [3]
(PIMCO Low Duration Fund) | Class P  
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
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.56%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 57
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 179
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 313
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 701
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 57
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 179
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 313
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 701
1 Year rr_AverageAnnualReturnYear01 0.68%
5 Years rr_AverageAnnualReturnYear05 2.61%
10 Years rr_AverageAnnualReturnYear10 3.72%
(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%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 73
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 227
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 395
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 883
1 Year rr_AverageAnnualReturnYear01 0.53%
5 Years rr_AverageAnnualReturnYear05 2.46%
10 Years rr_AverageAnnualReturnYear10 3.56%
(PIMCO Low Duration Fund) | Class D  
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 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 240
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 417
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 930
1 Year rr_AverageAnnualReturnYear01 0.49%
5 Years rr_AverageAnnualReturnYear05 2.42%
10 Years rr_AverageAnnualReturnYear10 3.51%
(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 0.55%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 305
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 475
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 659
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,193
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 305
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 475
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 659
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,193
1 Year rr_AverageAnnualReturnYear01 (1.82%)
5 Years rr_AverageAnnualReturnYear05 1.89%
10 Years rr_AverageAnnualReturnYear10 3.19%
(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%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.10%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 212
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 350
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 606
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,340
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 112
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 350
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 606
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,340
1 Year rr_AverageAnnualReturnYear01 (0.84%)
5 Years rr_AverageAnnualReturnYear05 2.05%
10 Years rr_AverageAnnualReturnYear10 3.01%
(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%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 107
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 0.19%
5 Years rr_AverageAnnualReturnYear05 2.10%
10 Years rr_AverageAnnualReturnYear10 3.16%
(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:
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, Class P 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. 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 170% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 170.00%
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 Pacific Investment Management Company LLC's ("PIMCO") forecast for interest rates. 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 stocks.
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:

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

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 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 derivatives are also subject to the risk that the other party in the transaction will not fulfill its contractual obligations. For derivatives traded on exchanges, the primary credit risk is the creditworthiness of the Fund's clearing broker or the exchange itself

Equity Risk: the risk that the value of equity securities, such as common stocks and preferred stocks, 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 Sale 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 may fail to honor its contract terms, 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 P shares (December 31, 2009), 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 Fund's past performance, before and after taxes, is not necessarily an indication of how the Fund will perform in the future.

The BofA Merrill Lynch 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 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 [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, 2015 is 0.52%. For the periods shown in the bar chart, the highest quarterly return was 4.89% in the Q2 2009, and the lowest quarterly return was -3.68% in the Q3 2008.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

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 P shares (December 31, 2009), 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 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 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.
(PIMCO Low Duration Fund II) | BofA Merrill Lynch 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.62%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 2.54%
(PIMCO Low Duration Fund II) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.75%
5 Years rr_AverageAnnualReturnYear05 2.16%
10 Years rr_AverageAnnualReturnYear10 2.70%
(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
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.50%
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 51
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 160
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 280
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 628
Annual Return 2005 rr_AnnualReturn2005 1.56%
Annual Return 2006 rr_AnnualReturn2006 3.47%
Annual Return 2007 rr_AnnualReturn2007 7.30%
Annual Return 2008 rr_AnnualReturn2008 (0.06%)
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%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 0.52%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.52%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 4.89% in the Q2 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 4.89%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel the lowest quarterly return was -3.68% in the Q3 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (3.68%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
1 Year rr_AverageAnnualReturnYear01 0.61%
5 Years rr_AverageAnnualReturnYear05 2.15%
10 Years rr_AverageAnnualReturnYear10 3.29%
(PIMCO Low Duration Fund II) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.01%) [3]
5 Years rr_AverageAnnualReturnYear05 1.28% [3]
10 Years rr_AverageAnnualReturnYear10 2.14% [3]
(PIMCO Low Duration Fund II) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.35% [3]
5 Years rr_AverageAnnualReturnYear05 1.36% [3]
10 Years rr_AverageAnnualReturnYear10 2.13% [3]
(PIMCO Low Duration Fund II) | Class P  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.60%
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 61
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 192
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 335
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 750
1 Year rr_AverageAnnualReturnYear01 0.51%
5 Years rr_AverageAnnualReturnYear05 2.04%
10 Years rr_AverageAnnualReturnYear10 3.18%
(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%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75%
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 240
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 417
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 930
1 Year rr_AverageAnnualReturnYear01 0.36%
5 Years rr_AverageAnnualReturnYear05 1.89%
10 Years rr_AverageAnnualReturnYear10 3.03%
(PIMCO Low Duration Fund III)  
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:
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, Class P 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. 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 159% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 159.00%
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 Pacific Investment Management Company LLC's ("PIMCO") forecast for interest rates. 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 issuer determined by PIMCO to be engaged principally in the provision of healthcare services, the manufacture of alcoholic beverages, tobacco products, pharmaceuticals or military equipment, the operation of gambling casinos or in the production or trade of pornographic materials. 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 addition, the Fund will not invest directly in securities of issuers that are engaged in certain business activities in or with the Republic of the Sudan (a "Sudan-Related Issuer"). In analyzing whether an issuer is a Sudan- Related Issuer, PIMCO may rely upon, among other things, information from a list provided by an independent third party.

The Fund invests primarily in investment grade 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 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 stocks.

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:

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 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 derivatives are also subject to the risk that the other party in the transaction will not fulfill its contractual obligations. For derivatives traded on exchanges, the primary credit risk is the creditworthiness of the Fund's clearing broker or the exchange itself

Equity Risk: the risk that the value of equity securities, such as common stocks and preferred stocks, 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 the 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 Sale 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 may fail to honor its contract terms, 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 P 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 actual distribution and/or service (12b-1) fees and other expenses paid by that class of 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 BofA Merrill Lynch 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 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 [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, 2015 is 0.79%. 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 -4.38% in the Q3 2008.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

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 P 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 actual distribution and/or service (12b-1) fees and other expenses paid by that class of 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 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.
(PIMCO Low Duration Fund III) | BofA Merrill Lynch 1-3 Year U.S. Treasury Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.62%
5 Years rr_AverageAnnualReturnYear05 1.06%
10 Years rr_AverageAnnualReturnYear10 2.54%
(PIMCO Low Duration Fund III) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.75%
5 Years rr_AverageAnnualReturnYear05 2.16%
10 Years rr_AverageAnnualReturnYear10 2.70%
(PIMCO Low Duration Fund III) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.50%
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 51
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 160
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 280
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 628
Annual Return 2005 rr_AnnualReturn2005 1.60%
Annual Return 2006 rr_AnnualReturn2006 3.75%
Annual Return 2007 rr_AnnualReturn2007 7.78%
Annual Return 2008 rr_AnnualReturn2008 (2.37%)
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%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 0.79%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.79%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
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 -4.38% in the Q3 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (4.38%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2008
1 Year rr_AverageAnnualReturnYear01 0.82%
5 Years rr_AverageAnnualReturnYear05 2.94%
10 Years rr_AverageAnnualReturnYear10 3.65%
(PIMCO Low Duration Fund III) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 (0.51%) [3]
5 Years rr_AverageAnnualReturnYear05 1.88% [3]
10 Years rr_AverageAnnualReturnYear10 2.21% [3]
(PIMCO Low Duration Fund III) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.47% [3]
5 Years rr_AverageAnnualReturnYear05 1.88% [3]
10 Years rr_AverageAnnualReturnYear10 2.29% [3]
(PIMCO Low Duration Fund III) | Class P  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.60%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.60%
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 61
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 192
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 335
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 750
1 Year rr_AverageAnnualReturnYear01 0.72%
5 Years rr_AverageAnnualReturnYear05 2.84%
10 Years rr_AverageAnnualReturnYear10 3.55%
(PIMCO Low Duration Fund III) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.75%
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 $ 77
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 240
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 417
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 930
1 Year rr_AverageAnnualReturnYear01 0.57%
5 Years rr_AverageAnnualReturnYear05 2.68%
10 Years rr_AverageAnnualReturnYear10 3.39%
(PIMCO 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:
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, Class M, Class P, 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. 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:

Strategy [Heading] rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

The Fund seeks to achieve its investment objective by complying with the quality, maturity and diversification of securities requirements applicable to money market funds. 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 may invest in the following U.S. dollar-denominated instruments: obligations of the U.S. Government (including its agencies and instrumentalities); short-term corporate debt securities of domestic and foreign corporations; obligations of domestic and foreign commercial banks, savings banks, and savings and loan associations; and commercial paper. The Fund may invest more than 25% of its total assets in or obligations issued by U.S. banks.
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:

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

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

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

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

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 Institutional Class shares. Class M and Class P shares of the Fund have not commenced operations as of the date of this prospectus. Performance for Class A and Class C 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 is not necessarily an indication of how the Fund will perform in the future.

The Citi 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 Institutional Money Market Funds Average is a total return performance average of funds tracked by Lipper, Inc. that invest in high quality financial instruments (rated in the top two grades) with dollar-weighted maturities of less than 90 days.

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 [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, 2015 is 0.00%. For the periods shown in the bar chart, the highest quarterly return was 1.30% in the Q4 2006, and the lowest quarterly return was 0.00% in the Q3 2013.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund's past performance 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. Class M and Class P shares of the Fund have not commenced operations as of the date of this prospectus. Performance for Class A and Class C 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 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.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 888.87.PIMCO
(PIMCO Money Market Fund) | Citi 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.03%
5 Years rr_AverageAnnualReturnYear05 0.07%
10 Years rr_AverageAnnualReturnYear10 1.46%
(PIMCO Money Market Fund) | Lipper Institutional Money Market Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.05%
10 Years rr_AverageAnnualReturnYear10 1.57%
(PIMCO Money Market Fund) | Institutional Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.32% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 33
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 103
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 406
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 33
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 103
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 180
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 406
Annual Return 2005 rr_AnnualReturn2005 2.96%
Annual Return 2006 rr_AnnualReturn2006 4.82%
Annual Return 2007 rr_AnnualReturn2007 5.04%
Annual Return 2008 rr_AnnualReturn2008 2.32%
Annual Return 2009 rr_AnnualReturn2009 0.15%
Annual Return 2010 rr_AnnualReturn2010 0.05%
Annual Return 2011 rr_AnnualReturn2011 0.07%
Annual Return 2012 rr_AnnualReturn2012 0.06%
Annual Return 2013 rr_AnnualReturn2013 0.01%
Annual Return 2014 rr_AnnualReturn2014 0.02%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 0.00%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn none
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 1.30% in the Q4 2006
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.30%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Dec. 31, 2006
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 0.02%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 1.53%
(PIMCO Money Market Fund) | Class M  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.32% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 33
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 103
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 406
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 33
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 103
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 180
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 406
(PIMCO Money Market Fund) | Class P  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.42%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.42% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 135
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 235
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 530
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 43
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 135
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 235
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 530
(PIMCO Money Market Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.32%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.32% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 33
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 103
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 180
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 406
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 33
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 103
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 180
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 406
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 1.43%
(PIMCO Money Market Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.47%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.47% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 48
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 151
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 263
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 591
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 48
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 151
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 263
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 591
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 1.43%
(PIMCO Money Market Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.47%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.47% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 48
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 151
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 263
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 591
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 48
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 151
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 263
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 591
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 1.43%
(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. 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 35 of the Fund's prospectus 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, 2016
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Example. The Example is intended to help you compare the cost of investing in Institutional Class, Class M, Class P, Administrative Class, Class D, 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. 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 2,324% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 2324.00%
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 Pacific Investment Management Company LLC's ("PIMCO") forecast for interest rates 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:

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

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 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 derivatives are also subject to the risk that the other party in the transaction will not fulfill its contractual obligations. For derivatives traded on exchanges, the primary credit risk is the creditworthiness of the Fund's clearing broker or the exchange itself

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 Sale 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 may fail to honor its contract terms, 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. Class M, Class C and Class R shares of the Fund have not commenced operations as of the date of this prospectus. Performance for Administrative Class, Class A, Class D, and Class P 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 Citi 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 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 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 [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, 2015 is 0.49%. For the periods shown in the bar chart, the highest quarterly return was 0.37% in the Q3 2013, and the lowest quarterly return was -0.12% in the Q4 2014.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

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. Class M, Class C and Class R shares of the Fund have not commenced operations as of the date of this prospectus. Performance for Administrative Class, Class A, Class D, and Class P 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 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.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 888.87.PIMCO
(PIMCO Short Asset Investment Fund) | Citi 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.03%
Since Inception rr_AverageAnnualReturnSinceInception 0.05%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Lipper Short Investment Grade Debt Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.75%
Since Inception rr_AverageAnnualReturnSinceInception 1.28%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment 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 0.34%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.36% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.26% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 27
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 106
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 192
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 446
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 27
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 106
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 192
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 446
Annual Return 2013 rr_AnnualReturn2013 0.72%
Annual Return 2014 rr_AnnualReturn2014 0.59%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 0.49%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.49%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel the highest quarterly return was 0.37% in the Q3 2013
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.37%
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2013
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 0.59%
Since Inception rr_AverageAnnualReturnSinceInception 1.12%
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 0.16% [3]
Since Inception rr_AverageAnnualReturnSinceInception 0.70% [3]
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012 [3]
(PIMCO Short Asset Investment Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.34% [3]
Since Inception rr_AverageAnnualReturnSinceInception 0.68% [3]
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012 [3]
(PIMCO Short Asset Investment Fund) | Class M  
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 0.34%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.36% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.26% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 27
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 106
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 192
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 446
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 27
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 106
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 192
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 446
(PIMCO Short Asset Investment Fund) | Class P  
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 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.46% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.36% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 37
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 138
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 248
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 569
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 37
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 138
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 248
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 569
1 Year rr_AverageAnnualReturnYear01 0.49%
Since Inception rr_AverageAnnualReturnSinceInception 1.02%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment 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 0.34%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.61% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.51% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 52
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 185
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 330
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 753
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 52
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 185
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 330
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 753
1 Year rr_AverageAnnualReturnYear01 0.34%
Since Inception rr_AverageAnnualReturnSinceInception 0.87%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment Fund) | Class D  
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 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.61% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 62
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 217
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 385
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 873
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 62
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 217
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 385
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 873
1 Year rr_AverageAnnualReturnYear01 0.24%
Since Inception rr_AverageAnnualReturnSinceInception 0.77%
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment 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 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.61% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 286
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 437
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 602
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,078
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 286
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 437
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 602
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,078
1 Year rr_AverageAnnualReturnYear01 (2.00%)
Since Inception rr_AverageAnnualReturnSinceInception (0.11%)
Inception Date rr_AverageAnnualReturnInceptionDate May 31, 2012
(PIMCO Short Asset Investment 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 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.55%
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.91% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 193
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 312
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 548
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,227
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 93
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 312
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 548
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,227
(PIMCO Short Asset Investment 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 0.44%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses rr_OtherExpensesOverAssets 0.02% [4]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96% [5]
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.10%) [6]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.86% [7]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 88
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 296
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 521
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,169
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 88
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 296
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 521
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,169
(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. 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 35 of the Fund's prospectus 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):

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, Administrative Class, Class D, 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. 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 283% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 283.00%
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 Pacific Investment Management Company LLC's ("PIMCO") forecast for interest rates 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 stocks.
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:

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 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 derivatives are also subject to the risk that the other party in the transaction will not fulfill its contractual obligations. For derivatives traded on exchanges, the primary credit risk is the creditworthiness of the Fund's clearing broker or the exchange itself

Equity Risk: the risk that the value of equity securities, such as common stocks and preferred stocks, 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 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 Sale 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 may fail to honor its contract terms, 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 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 Citi 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 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 [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, 2015 is 1.18%. 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 -1.95% in the Q4 2008.

Performance Table Heading rr_PerformanceTableHeading

Average Annual Total Returns (for periods ended 12/31/14)

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 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 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 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.
(PIMCO Short-Term Fund) | Citi 3-Month Treasury Bill Index (reflects no deductions for fees, expenses or taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.03%
5 Years rr_AverageAnnualReturnYear05 0.07%
10 Years rr_AverageAnnualReturnYear10 1.46%
(PIMCO Short-Term Fund) | Lipper Ultra-Short Obligation Funds Average (reflects no deductions for taxes)  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.40%
5 Years rr_AverageAnnualReturnYear05 0.93%
10 Years rr_AverageAnnualReturnYear10 2.06%
(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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.46% [9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 47
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 148
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 258
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 579
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 47
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 148
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 258
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 579
Annual Return 2005 rr_AnnualReturn2005 2.65%
Annual Return 2006 rr_AnnualReturn2006 4.52%
Annual Return 2007 rr_AnnualReturn2007 4.55%
Annual Return 2008 rr_AnnualReturn2008 (1.30%)
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%
Year to Date Return, Label rr_YearToDateReturnLabel The year-to-date return as of June 30, 2015 is 1.18%.
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.18%
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2015
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 -1.95% in the Q4 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.95%)
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
1 Year rr_AverageAnnualReturnYear01 0.97%
5 Years rr_AverageAnnualReturnYear05 1.50%
10 Years rr_AverageAnnualReturnYear10 2.70%
(PIMCO Short-Term Fund) | Institutional Class | Return After Taxes on Distributions  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.14% [3]
5 Years rr_AverageAnnualReturnYear05 0.90% [3]
10 Years rr_AverageAnnualReturnYear10 1.66% [3]
(PIMCO Short-Term Fund) | Institutional Class | Return After Taxes on Distributions and Sales of Fund Shares  
Prospectus: rr_ProspectusTable  
1 Year rr_AverageAnnualReturnYear01 0.59% [3]
5 Years rr_AverageAnnualReturnYear05 0.94% [3]
10 Years rr_AverageAnnualReturnYear10 1.72% [3]
(PIMCO Short-Term Fund) | Class P  
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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.56% [9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 57
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 179
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 313
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 701
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 57
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 179
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 313
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 701
1 Year rr_AverageAnnualReturnYear01 0.86%
5 Years rr_AverageAnnualReturnYear05 1.40%
10 Years rr_AverageAnnualReturnYear10 2.60%
(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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71% [9]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 73
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 227
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 395
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 883
1 Year rr_AverageAnnualReturnYear01 0.71%
5 Years rr_AverageAnnualReturnYear05 1.25%
10 Years rr_AverageAnnualReturnYear10 2.44%
(PIMCO Short-Term Fund) | Class D  
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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71% [9]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 73
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 227
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 395
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 883
1 Year rr_AverageAnnualReturnYear01 0.71%
5 Years rr_AverageAnnualReturnYear05 1.23%
10 Years rr_AverageAnnualReturnYear10 2.41%
(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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.71% [9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 296
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 447
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 611
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,088
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 296
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 447
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 611
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,088
1 Year rr_AverageAnnualReturnYear01 (1.55%)
5 Years rr_AverageAnnualReturnYear05 0.76%
10 Years rr_AverageAnnualReturnYear10 2.16%
(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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.01% [9]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 203
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 322
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 558
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,236
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 103
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 322
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 558
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,236
1 Year rr_AverageAnnualReturnYear01 (0.58%)
5 Years rr_AverageAnnualReturnYear05 0.92%
10 Years rr_AverageAnnualReturnYear10 2.08%
(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 0.01% [8]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.96% [9]
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
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 98
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 306
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 531
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,178
1 Year rr_AverageAnnualReturnYear01 0.46%
5 Years rr_AverageAnnualReturnYear05 0.97%
10 Years rr_AverageAnnualReturnYear10 2.13%
(PIMCO Treasury 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:
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):

Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination July 31, 2016
Other Expenses, New Fund, Based on Estimates [Text] rr_OtherExpensesNewFundBasedOnEstimates Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

Example. The Example is intended to help you compare the cost of investing in Class M, Class P, Administrative Class, Class D, 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. 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:

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. Treasury securities. The Fund may invest in the following: U.S. Treasury bills, notes, trust receipts and other direct obligations of the U.S. Treasury and repurchase agreements secured by such obligations. 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.
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:

New/Small Fund Risk: the risk that a new or smaller Fund's performance may not represent how the Fund is expected to or may perform in the long-term. In addition, new Funds have limited operating histories for investors to evaluate and new and smaller Funds may not attract sufficient assets to achieve investment and trading efficiencies

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

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

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 Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Returns Table is included.

The Fund's benchmark index is the Citi 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.

Once the Fund commences operations, performance for the Fund will be 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.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress performance for the Fund will be 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.
(PIMCO Treasury Money Market Fund) | Class M  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.21%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.18% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 65
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 65
(PIMCO Treasury Money Market Fund) | Class P  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.28%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.31%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.28% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 29
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 97
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 29
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 97
(PIMCO Treasury Money Market Fund) | Administrative Class  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.21%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.18% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 65
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 65
(PIMCO Treasury Money Market Fund) | Class D  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.18%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.21%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.18% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 18
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 65
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 18
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 65
(PIMCO Treasury Money Market Fund) | Class A  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.36%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.33% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 113
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 34
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 113
(PIMCO Treasury Money Market Fund) | Class C  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.36%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.33% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 113
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 34
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 113
(PIMCO Treasury Money Market Fund) | Class R  
Prospectus: rr_ProspectusTable  
Management Fees rr_ManagementFeesOverAssets 0.33%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Expenses rr_OtherExpensesOverAssets 0.03% [10]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.36%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.03%) [11]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.33% [12]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 34
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 113
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 34
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 $ 113
[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] 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.
[3] 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.
[4] "Other Expenses" reflect interest expense. Interest expense results from the Fund's use of certain investments such as reverse repurchase agreements. Such expense is required to be treated as a Fund expense for accounting purposes and is not payable to PIMCO. Any interest expense amount will vary based on the Fund's use of those investments as an investment strategy best suited to seek the objective of the Fund.
[5] Total Annual Fund Operating Expenses excluding interest expense is 0.34%, 0.34%, 0.44%, 0.59%, 0.69%, 0.69%, 0.99% and 0.94% for Institutional Class, Class M, Class P, Administrative Class, Class D, Class A, Class C and Class R shares, respectively.
[6] PIMCO has contractually agreed, through July 31, 2016, to reduce its advisory fee by 0.10% of the average daily net assets of the Fund. This Fee Limitation Agreement renews annually unless terminated by PIMCO upon at least 30 days' notice prior to the end of the contract term. Under certain conditions, PIMCO may recoup amounts reduced in future periods, not exceeding three years.
[7] Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement excluding interest expense is 0.24%, 0.24%, 0.34%, 0.49%, 0.59%, 0.59%, 0.89% and 0.84% for Institutional Class, Class M, Class P, Administrative Class, Class D, Class A, Class C and Class R shares, respectively.
[8] "Other Expenses" reflect interest expense. Interest expense results from the Fund's use of certain investments such as reverse repurchase agreements. Such expense is required to be treated as a Fund expense for accounting purposes and is not payable to Pacific Investment Management Company LLC ("PIMCO"). Any interest expense amount will vary based on the Fund's use of those investments as an investment strategy best suited to seek the objective of the Fund.
[9] Total Annual Fund Operating Expenses excluding interest expense is 0.45%, 0.55%, 0.70%, 0.70%, 0.70%, 1.00% and 0.95% for Institutional Class, Class P, Administrative Class, Class D, Class A, Class C and Class R shares, respectively.
[10] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.
[11] Pacific Investment Management Company LLC ("PIMCO") has contractually agreed, through July 31, 2016, to waive its supervisory and administrative fee, or reimburse the Fund, to the extent that organizational expenses and pro rata Trustees' fees exceed 0.0049% of the Fund's average net assets attributable to Class M, Class P, Administrative Class, Class D, Class A, Class C and Class R shares, respectively (the "Expense Limit"). Under the Expense Limitation Agreement, which renews annually for a full year unless terminated by PIMCO upon at least 30 days' notice prior to the end of the contract term, PIMCO may recoup these waivers and reimbursements in future periods, not exceeding three years, provided organizational expenses and pro rata Trustees' fees, plus such recoupment, do not exceed the Expense Limit.
[12] To maintain certain net yields for the Fund, 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.