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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.

Risk [Heading] rr_RiskHeading

Principal Risks

Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

Although the Fund seeks to preserve the value of your investment at $1.00 per share, 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

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. 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 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.
(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 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 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 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
[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.