485BPOS

As filed with the Securities and Exchange Commission on October 16, 2012

File Nos. 033-12113

811-05028

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

Form N-1A

REGISTRATION STATEMENT UNDER THE SECURITIES ACT OF 1933	T
Post-Effective Amendment No. 241	T
And
REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	T
Amendment No. 313	T

PIMCO Funds

(Exact name of Registrant as Specified in Charter)

840 Newport Center Drive

Newport Beach, California 92660

(Address of Principal Executive Offices) (Zip Code)

Registrant’s Telephone Number, including area code:

(866) 746-2606

Robert W. Helm, Esq. Brendan C. Fox, Esq. Dechert LLP 1775 I Street, N.W. Washington, D.C. 20006	Brent R. Harris Pacific Investment Management Company LLC 840 Newport Center Drive Newport Beach, California 92660
(Name and Address of Agent for Service)

It is proposed that this filing will become effective (check appropriate box):

S immediately upon filing pursuant to paragraph (b)	£ on (date) pursuant to paragraph (b)
£ 60 days after filing pursuant to paragraph (a)(1)	£ on (date) pursuant to paragraph (a)(1)
£ 75 days after filing pursuant to paragraph (a)(2)	£ on (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

£ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended (the “1933 Act”) and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all the requirements of effectiveness of this Post-Effective Amendment No. 241 to its Registration Statement under Rule 485(b) of the 1933 Act and has duly caused this Post-Effective Amendment No. 241 to be signed on its behalf by the undersigned, thereunto duly authorized, in the city of Washington in the District of Columbia on the 16^th day of October 2012.

PIMCO FUNDS (Registrant)
By:
	Brent R. Harris*, President

*By:	/s/ BRENDAN C. FOX
	Brendan C. Fox as attorney-in fact

Pursuant to the requirements of the Securities Act of 1933, this Registration Statement has been signed by the following persons in the capacities and on the dates indicated:

Signature	Title	Date
Brent R. Harris*	Trustee	October 16, 2012
William J. Popejoy*	Trustee	October 16, 2012
Vern O. Curtis*	Trustee	October 16, 2012
E. Philip Cannon*	Trustee	October 16, 2012
J. Michael Hagan*	Trustee	October 16, 2012
Douglas M. Hodge*	Trustee	October 16, 2012
Ronald C. Parker*	Trustee	October 16, 2012
	President	October 16, 2012
Brent R. Harris*	(Principal Executive Officer)
	Treasurer	October 16, 2012
John P. Hardaway*	(Principal Financial and Accounting Officer)

*By:	/s/ BRENDAN C. FOX
	Brendan C. Fox
	as attorney-in-fact

______________

*        Pursuant to power of attorney filed with Post-Effective Amendment No. 177 to Registration Statement No. 33-12113 on July 27, 2010.

EXHIBIT LIST

EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase Document
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase Document
EX-101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document

XML

(PIMCO Mortgage Opportunities Fund - Institutional) |

Investment Objective

The Fund seeks maximum long-term return, consistent with prudent investment management.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund:

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses (PIMCO Mortgage Opportunities Fund - Institutional)		Institutional Class	Class P	Administrative Class	Class D
Management Fees		0.60%	0.70%	0.60%	0.75%
Distribution and/or Service (12b-1) Fees				0.25%	0.25%
Other Expenses	[1]	0.15%	0.15%	0.15%	0.15%
Total Annual Fund Operating Expenses		0.75%	0.85%	1.00%	1.15%
Expense Reimbursement	[2]	(0.15%)	(0.15%)	(0.15%)	(0.15%)
Total Annual Fund Operating Expenses After Expense Reimbursement		0.60%	0.70%	0.85%	1.00%

Example. The Example is intended to help you compare the cost of investing in Institutional Class, Class P, Administrative Class or Class D 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, the Example shows what your costs would be based on these assumptions.

Expense Example (PIMCO Mortgage Opportunities Fund - Institutional) (USD $)	1 Year	3 Years
Institutional Class	61	192
Class P	72	224
Administrative Class	87	271
Class D	102	318

Portfolio Turnover

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. The Fund has not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in a portfolio of mortgage-related assets, including, but not limited to Agency residential and commercial mortgage-backed securities ("MBS") and private label residential and commercial MBS, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Agency MBS refers to MBS issued by government-sponsored enterprises, such as the Government National Mortgage Association ("GNMA" or "Ginnie Mae"), the Federal National Mortgage Association ("FNMA" or "Fannie Mae") or the Federal Home Loan Mortgage Corporation ("FHLMC" or "Freddie Mac"). The Fund will invest in a broad array of mortgage-related securities in seeking to generate consistent, absolute returns across full market cycles. The remaining 20% of the Fund's assets may be invested in other types of "Fixed Income Instruments," which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private sector entities. The average portfolio duration of this Fund normally varies from (negative) 1 year to positive 8 years based on PIMCO's 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 up to 50% of its total assets in high yield securities ("junk bonds") that are rated Caa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by Pacific Investment Management Company LLC ("PIMCO") to be of comparable quality (except such limitation shall not apply to the Fund's investments in mortgage-related securities). The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts, options on futures, fixed income swap agreements, credit default swap agreements and other synthetic mortgage-related swap indices, 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 invest up to 10% of its total assets in any combination of mortgage-related or other asset-backed interest-only ("IO"), principal-only ("PO"), or inverse floating rate debt ("inverse floater") securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, 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.

Principal Risks

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

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 and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments

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

Derivatives Risk: the risk of investing in derivative instruments, including liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Mortgage-Related and Other Asset-Backed Risk: the risk of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Extension Risk: the risk that, in periods of rising interest rates, issuers of mortgage-related and other asset-backed securities may pay principal later than expected, which may reduce the value of the Fund's investment in such securities and may prevent the Fund from receiving higher interest rates on proceeds reinvested

Prepayment Risk: the risk that, in periods of declining interest rates, issuers of mortgage-related and other asset-backed securities may pay principal more quickly than expected, which results in the Fund foregoing future interest income on the portion of the principal repaid early and may result in the Fund being forced to reinvest investment proceeds at lower interest rates

Privately Issued Mortgage-Related Securities Risk: the risk of non-payment because there are no direct or indirect government or agency guarantees of payments in the pools created by non-governmental issuers

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, causing the Fund to be more volatile than if it had not been leveraged

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 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

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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.

Performance Information

The Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Total Returns table is included for the Fund. 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.

The Fund's benchmark index is the 3-Month USD LIBOR Index. LIBOR (London Interbank Offered Rate) is an average interest rate, determined by the British Bankers Association that banks charge one another for the use of short-term money (3 months) in England's Eurodollar market.

[1] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.

[2] PIMCO has contractually agreed, through July 31, 2014, 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 Institutional Class, Class P, Administrative Class and Class D 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.

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Annual Fund Operating Expenses (dei_LegalEntityAxis)	0 Months Ended
	Oct. 01, 2012
(PIMCO Mortgage Opportunities Fund - Institutional) | Administrative Class
Operating Expenses:
Management Fees	0.60%
Distribution and/or Service (12b-1) Fees	0.25%
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	1.00%
Expense Reimbursement	(0.15%)	[2]
Total Annual Fund Operating Expenses After Expense Reimbursement	0.85%
(PIMCO Mortgage Opportunities Fund - Institutional) | Class D
Operating Expenses:
Management Fees	0.75%
Distribution and/or Service (12b-1) Fees	0.25%
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	1.15%
Expense Reimbursement	(0.15%)	[2]
Total Annual Fund Operating Expenses After Expense Reimbursement	1.00%
(PIMCO Mortgage Opportunities Fund - Institutional) | Institutional Class
Operating Expenses:
Management Fees	0.60%
Distribution and/or Service (12b-1) Fees
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	0.75%
Expense Reimbursement	(0.15%)	[2]
Total Annual Fund Operating Expenses After Expense Reimbursement	0.60%
(PIMCO Mortgage Opportunities Fund - Institutional) | Class P
Operating Expenses:
Management Fees	0.70%
Distribution and/or Service (12b-1) Fees
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	0.85%
Expense Reimbursement	(0.15%)	[2]
Total Annual Fund Operating Expenses After Expense Reimbursement	0.70%
(PIMCO Mortgage Opportunities Fund - Retail) | Class A
Operating Expenses:
Management Fees	0.75%
Distribution and/or Service (12b-1) Fees	0.25%
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	1.15%
Expense Reimbursement	(0.15%)	[3]
Total Annual Fund Operating Expenses After Expense Reimbursement	1.00%
(PIMCO Mortgage Opportunities Fund - Retail) | Class C
Operating Expenses:
Management Fees	0.75%
Distribution and/or Service (12b-1) Fees	1.00%
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	1.90%
Expense Reimbursement	(0.15%)	[3]
Total Annual Fund Operating Expenses After Expense Reimbursement	1.75%
(PIMCO Mortgage Opportunities Fund - Retail) | Class R
Operating Expenses:
Management Fees	0.75%
Distribution and/or Service (12b-1) Fees	0.50%
Other Expenses	0.15%	[1]
Total Annual Fund Operating Expenses	1.40%
Expense Reimbursement	(0.15%)	[3]
Total Annual Fund Operating Expenses After Expense Reimbursement	1.25%

[1] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.

[2] PIMCO has contractually agreed, through July 31, 2014, 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 Institutional Class, Class P, Administrative Class and Class D 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.

[3] PIMCO has contractually agreed, through July 31, 2014, 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 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.

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(PIMCO Mortgage Opportunities Fund - Retail) |

Investment Objective

The Fund seeks maximum long-term return, consistent with prudent investment management.

Fees and Expenses of the Fund

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—Class A, C and R Shares" section on page 9 of the Fund's prospectus or from your financial advisor.

Shareholder Fees (fees paid directly from your investment):

Shareholder Fees (PIMCO Mortgage Opportunities Fund - Retail)	Class A	Class C	Class R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.75%	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)	1.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses (PIMCO Mortgage Opportunities Fund - Retail)		Class A	Class C	Class R
Management Fees		0.75%	0.75%	0.75%
Distribution and/or Service (12b-1) Fees		0.25%	1.00%	0.50%
Other Expenses	[1]	0.15%	0.15%	0.15%
Total Annual Fund Operating Expenses		1.15%	1.90%	1.40%
Expense Reimbursement	[2]	(0.15%)	(0.15%)	(0.15%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.00%	1.75%	1.25%

Example. The Example is intended to help you compare the cost of investing in 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:

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

Expense Example (PIMCO Mortgage Opportunities Fund - Retail) (USD $)	1 Year	3 Years
Class A	473	681
Class C	278	551
Class R	127	397

If you do not redeem your shares:

Expense Example, No Redemption (PIMCO Mortgage Opportunities Fund - Retail) (USD $)	1 Year	3 Years
Class A	473	681
Class C	178	551
Class R	127	397

Portfolio Turnover

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. The Fund has not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in a portfolio of mortgage-related assets, including, but not limited to Agency residential and commercial mortgage-backed securities ("MBS") and private label residential and commercial MBS, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Agency MBS refers to MBS issued by government-sponsored enterprises, such as the Government National Mortgage Association ("GNMA" or "Ginnie Mae"), the Federal National Mortgage Association ("FNMA" or "Fannie Mae") or the Federal Home Loan Mortgage Corporation ("FHLMC" or "Freddie Mac"). The Fund will invest in a broad array of mortgage-related securities in seeking to generate consistent, absolute returns across full market cycles. The remaining 20% of the Fund's assets may be invested in other types of "Fixed Income Instruments," which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private sector entities. The average portfolio duration of this Fund normally varies from (negative) 1 year to positive 8 years based on PIMCO's 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 up to 50% of its total assets in high yield securities ("junk bonds") that are rated Caa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by Pacific Investment Management Company LLC ("PIMCO") to be of comparable quality (except such limitation shall not apply to the Fund's investments in mortgage-related securities). The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts, options on futures, fixed income swap agreements, credit default swap agreements and other synthetic mortgage-related swap indices, 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 invest up to 10% of its total assets in any combination of mortgage-related or other asset-backed interest-only ("IO"), principal-only ("PO"), or inverse floating rate debt ("inverse floater") securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, 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.

Principal Risks

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

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 and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments

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

Derivatives Risk: the risk of investing in derivative instruments, including liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Mortgage-Related and Other Asset-Backed Risk: the risk of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Extension Risk: the risk that, in periods of rising interest rates, issuers of mortgage-related and other asset-backed securities may pay principal later than expected, which may reduce the value of the Fund's investment in such securities and may prevent the Fund from receiving higher interest rates on proceeds reinvested

Prepayment Risk: the risk that, in periods of declining interest rates, issuers of mortgage-related and other asset-backed securities may pay principal more quickly than expected, which results in the Fund foregoing future interest income on the portion of the principal repaid early and may result in the Fund being forced to reinvest investment proceeds at lower interest rates

Privately Issued Mortgage-Related Securities Risk: the risk of non-payment because there are no direct or indirect government or agency guarantees of payments in the pools created by non-governmental issuers

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, causing the Fund to be more volatile than if it had not been leveraged

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 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

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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.

Performance Information

The Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Total Returns table is included for the Fund. 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.

The Fund's benchmark index is the 3-Month USD LIBOR Index. LIBOR (London Interbank Offered Rate) is an average interest rate, determined by the British Bankers Association that banks charge one another for the use of short-term money (3 months) in England's Eurodollar market.

[1] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.

[2] PIMCO has contractually agreed, through July 31, 2014, 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 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.

XML

(PIMCO Mortgage Opportunities Fund - Institutional)

Investment Objective

The Fund seeks maximum long-term return, consistent with prudent investment management.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund:

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses (PIMCO Mortgage Opportunities Fund - Institutional)		Institutional Class	Class P	Administrative Class	Class D
Management Fees		0.60%	0.70%	0.60%	0.75%
Distribution and/or Service (12b-1) Fees				0.25%	0.25%
Other Expenses	[1]	0.15%	0.15%	0.15%	0.15%
Total Annual Fund Operating Expenses		0.75%	0.85%	1.00%	1.15%
Expense Reimbursement	[2]	(0.15%)	(0.15%)	(0.15%)	(0.15%)
Total Annual Fund Operating Expenses After Expense Reimbursement		0.60%	0.70%	0.85%	1.00%

Example. The Example is intended to help you compare the cost of investing in Institutional Class, Class P, Administrative Class or Class D 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, the Example shows what your costs would be based on these assumptions.

Expense Example (PIMCO Mortgage Opportunities Fund - Institutional) (USD $)	1 Year	3 Years
Institutional Class	61	192
Class P	72	224
Administrative Class	87	271
Class D	102	318

Portfolio Turnover

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. The Fund has not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in a portfolio of mortgage-related assets, including, but not limited to Agency residential and commercial mortgage-backed securities ("MBS") and private label residential and commercial MBS, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Agency MBS refers to MBS issued by government-sponsored enterprises, such as the Government National Mortgage Association ("GNMA" or "Ginnie Mae"), the Federal National Mortgage Association ("FNMA" or "Fannie Mae") or the Federal Home Loan Mortgage Corporation ("FHLMC" or "Freddie Mac"). The Fund will invest in a broad array of mortgage-related securities in seeking to generate consistent, absolute returns across full market cycles. The remaining 20% of the Fund's assets may be invested in other types of "Fixed Income Instruments," which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private sector entities. The average portfolio duration of this Fund normally varies from (negative) 1 year to positive 8 years based on PIMCO's 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 up to 50% of its total assets in high yield securities ("junk bonds") that are rated Caa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by Pacific Investment Management Company LLC ("PIMCO") to be of comparable quality (except such limitation shall not apply to the Fund's investments in mortgage-related securities). The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts, options on futures, fixed income swap agreements, credit default swap agreements and other synthetic mortgage-related swap indices, 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 invest up to 10% of its total assets in any combination of mortgage-related or other asset-backed interest-only ("IO"), principal-only ("PO"), or inverse floating rate debt ("inverse floater") securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, 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.

Principal Risks

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

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 and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments

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

Derivatives Risk: the risk of investing in derivative instruments, including liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Mortgage-Related and Other Asset-Backed Risk: the risk of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Extension Risk: the risk that, in periods of rising interest rates, issuers of mortgage-related and other asset-backed securities may pay principal later than expected, which may reduce the value of the Fund's investment in such securities and may prevent the Fund from receiving higher interest rates on proceeds reinvested

Prepayment Risk: the risk that, in periods of declining interest rates, issuers of mortgage-related and other asset-backed securities may pay principal more quickly than expected, which results in the Fund foregoing future interest income on the portion of the principal repaid early and may result in the Fund being forced to reinvest investment proceeds at lower interest rates

Privately Issued Mortgage-Related Securities Risk: the risk of non-payment because there are no direct or indirect government or agency guarantees of payments in the pools created by non-governmental issuers

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, causing the Fund to be more volatile than if it had not been leveraged

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 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

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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.

Performance Information

The Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Total Returns table is included for the Fund. 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.

The Fund's benchmark index is the 3-Month USD LIBOR Index. LIBOR (London Interbank Offered Rate) is an average interest rate, determined by the British Bankers Association that banks charge one another for the use of short-term money (3 months) in England's Eurodollar market.

(PIMCO Mortgage Opportunities Fund - Retail)

Investment Objective

The Fund seeks maximum long-term return, consistent with prudent investment management.

Fees and Expenses of the Fund

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—Class A, C and R Shares" section on page 9 of the Fund's prospectus or from your financial advisor.

Shareholder Fees (fees paid directly from your investment):

Shareholder Fees (PIMCO Mortgage Opportunities Fund - Retail)	Class A	Class C	Class R
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.75%	none	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)	1.00%	1.00%	none

Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment):

Annual Fund Operating Expenses (PIMCO Mortgage Opportunities Fund - Retail)		Class A	Class C	Class R
Management Fees		0.75%	0.75%	0.75%
Distribution and/or Service (12b-1) Fees		0.25%	1.00%	0.50%
Other Expenses	[1]	0.15%	0.15%	0.15%
Total Annual Fund Operating Expenses		1.15%	1.90%	1.40%
Expense Reimbursement	[2]	(0.15%)	(0.15%)	(0.15%)
Total Annual Fund Operating Expenses After Expense Reimbursement		1.00%	1.75%	1.25%

Example. The Example is intended to help you compare the cost of investing in 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:

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

Expense Example (PIMCO Mortgage Opportunities Fund - Retail) (USD $)	1 Year	3 Years
Class A	473	681
Class C	278	551
Class R	127	397

If you do not redeem your shares:

Expense Example, No Redemption (PIMCO Mortgage Opportunities Fund - Retail) (USD $)	1 Year	3 Years
Class A	473	681
Class C	178	551
Class R	127	397

Portfolio Turnover

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. The Fund has not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

Principal Investment Strategies

The Fund seeks to achieve its investment objective by investing under normal circumstances at least 80% of its assets in a portfolio of mortgage-related assets, including, but not limited to Agency residential and commercial mortgage-backed securities ("MBS") and private label residential and commercial MBS, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Agency MBS refers to MBS issued by government-sponsored enterprises, such as the Government National Mortgage Association ("GNMA" or "Ginnie Mae"), the Federal National Mortgage Association ("FNMA" or "Fannie Mae") or the Federal Home Loan Mortgage Corporation ("FHLMC" or "Freddie Mac"). The Fund will invest in a broad array of mortgage-related securities in seeking to generate consistent, absolute returns across full market cycles. The remaining 20% of the Fund's assets may be invested in other types of "Fixed Income Instruments," which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private sector entities. The average portfolio duration of this Fund normally varies from (negative) 1 year to positive 8 years based on PIMCO's 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 up to 50% of its total assets in high yield securities ("junk bonds") that are rated Caa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by Pacific Investment Management Company LLC ("PIMCO") to be of comparable quality (except such limitation shall not apply to the Fund's investments in mortgage-related securities). The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts, options on futures, fixed income swap agreements, credit default swap agreements and other synthetic mortgage-related swap indices, 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 invest up to 10% of its total assets in any combination of mortgage-related or other asset-backed interest-only ("IO"), principal-only ("PO"), or inverse floating rate debt ("inverse floater") securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, 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.

Principal Risks

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

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 and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments

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

Derivatives Risk: the risk of investing in derivative instruments, including liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Mortgage-Related and Other Asset-Backed Risk: the risk of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Extension Risk: the risk that, in periods of rising interest rates, issuers of mortgage-related and other asset-backed securities may pay principal later than expected, which may reduce the value of the Fund's investment in such securities and may prevent the Fund from receiving higher interest rates on proceeds reinvested

Prepayment Risk: the risk that, in periods of declining interest rates, issuers of mortgage-related and other asset-backed securities may pay principal more quickly than expected, which results in the Fund foregoing future interest income on the portion of the principal repaid early and may result in the Fund being forced to reinvest investment proceeds at lower interest rates

Privately Issued Mortgage-Related Securities Risk: the risk of non-payment because there are no direct or indirect government or agency guarantees of payments in the pools created by non-governmental issuers

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, causing the Fund to be more volatile than if it had not been leveraged

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 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

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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.

Performance Information

The Fund does not have a full calendar year of performance. Thus, no bar chart or Average Annual Total Returns table is included for the Fund. 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.

The Fund's benchmark index is the 3-Month USD LIBOR Index. LIBOR (London Interbank Offered Rate) is an average interest rate, determined by the British Bankers Association that banks charge one another for the use of short-term money (3 months) in England's Eurodollar market.

[1] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.

[2] PIMCO has contractually agreed, through July 31, 2014, 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 Institutional Class, Class P, Administrative Class and Class D 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.

[1] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.

[2] PIMCO has contractually agreed, through July 31, 2014, 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 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.

XML

Shareholder Fees ((PIMCO Mortgage Opportunities Fund - Retail), dei_LegalEntityAxis)	0 Months Ended
	Oct. 01, 2012
Class A
Shareholder Fees:
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	3.75%
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)	1.00%
Class C
Shareholder Fees:
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)	1.00%
Class R
Shareholder Fees:
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	none
Maximum Deferred Sales Charge (Load) (as a percentage of the lower of the original purchase price or redemption price)	none

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

485BPOS

Document Period End Date

dei_DocumentPeriodEndDate

Oct. 01, 2012

Registrant Name

dei_EntityRegistrantName

PIMCO FUNDS

Central Index Key

dei_EntityCentralIndexKey

0000810893

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Oct. 01, 2012

Document Effective Date

dei_DocumentEffectiveDate

Oct. 01, 2012

Prospectus Date

rr_ProspectusDate

Oct. 01, 2012

(PIMCO Mortgage Opportunities Fund - Institutional) |

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks maximum long-term return, consistent with 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):

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

2014-07-31

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. The Fund has not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

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 or Class D 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, the Example shows what your costs would be based on these assumptions.

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 mortgage-related assets, including, but not limited to Agency residential and commercial mortgage-backed securities ("MBS") and private label residential and commercial MBS, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Agency MBS refers to MBS issued by government-sponsored enterprises, such as the Government National Mortgage Association ("GNMA" or "Ginnie Mae"), the Federal National Mortgage Association ("FNMA" or "Fannie Mae") or the Federal Home Loan Mortgage Corporation ("FHLMC" or "Freddie Mac"). The Fund will invest in a broad array of mortgage-related securities in seeking to generate consistent, absolute returns across full market cycles. The remaining 20% of the Fund's assets may be invested in other types of "Fixed Income Instruments," which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private sector entities. The average portfolio duration of this Fund normally varies from (negative) 1 year to positive 8 years based on PIMCO's 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 up to 50% of its total assets in high yield securities ("junk bonds") that are rated Caa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by Pacific Investment Management Company LLC ("PIMCO") to be of comparable quality (except such limitation shall not apply to the Fund's investments in mortgage-related securities). The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts, options on futures, fixed income swap agreements, credit default swap agreements and other synthetic mortgage-related swap indices, 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 invest up to 10% of its total assets in any combination of mortgage-related or other asset-backed interest-only ("IO"), principal-only ("PO"), or inverse floating rate debt ("inverse floater") securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, 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.

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

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 and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments

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

Derivatives Risk: the risk of investing in derivative instruments, including liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Mortgage-Related and Other Asset-Backed Risk: the risk of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Extension Risk: the risk that, in periods of rising interest rates, issuers of mortgage-related and other asset-backed securities may pay principal later than expected, which may reduce the value of the Fund's investment in such securities and may prevent the Fund from receiving higher interest rates on proceeds reinvested

Prepayment Risk: the risk that, in periods of declining interest rates, issuers of mortgage-related and other asset-backed securities may pay principal more quickly than expected, which results in the Fund foregoing future interest income on the portion of the principal repaid early and may result in the Fund being forced to reinvest investment proceeds at lower interest rates

Privately Issued Mortgage-Related Securities Risk: the risk of non-payment because there are no direct or indirect government or agency guarantees of payments in the pools created by non-governmental issuers

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, causing the Fund to be more volatile than if it had not been leveraged

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 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

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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 Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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

The Fund's benchmark index is the 3-Month USD LIBOR Index. LIBOR (London Interbank Offered Rate) is an average interest rate, determined by the British Bankers Association that banks charge one another for the use of short-term money (3 months) in England's Eurodollar market.

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 Mortgage Opportunities Fund - Institutional) | | Administrative Class

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.60%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.00%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

0.85%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

87

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

271

(PIMCO Mortgage Opportunities Fund - Institutional) | | Class D

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.75%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.15%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

102

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

318

(PIMCO Mortgage Opportunities Fund - Institutional) | | Institutional Class

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.60%

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

rr_DistributionAndService12b1FeesOverAssets

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.75%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

0.60%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

61

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

192

(PIMCO Mortgage Opportunities Fund - Institutional) | | Class P

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.70%

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

rr_DistributionAndService12b1FeesOverAssets

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.85%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[3]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

0.70%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

72

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

224

(PIMCO Mortgage Opportunities Fund - Retail) |

Risk/Return:

rr_RiskReturnAbstract

Objective [Heading]

rr_ObjectiveHeading

Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

The Fund seeks maximum long-term return, consistent with 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—Class A, C and R Shares" section on page 9 of the Fund's prospectus or from your financial advisor.

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

2014-07-31

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. The Fund has not yet commenced operations as of the most recent fiscal year end. Thus, no portfolio turnover rate is provided for the Fund.

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A shares of eligible funds offered by PIMCO Equity Series and PIMCO Funds. More information about these and other discounts is available in the "Classes of Shares—Class A, C and R Shares" section on page 9 of the Fund's prospectus or from your financial advisor.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

100,000

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

Example. The Example is intended to help you compare the cost of investing in 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 mortgage-related assets, including, but not limited to Agency residential and commercial mortgage-backed securities ("MBS") and private label residential and commercial MBS, which may be represented by forwards or derivatives such as options, futures contracts or swap agreements. Agency MBS refers to MBS issued by government-sponsored enterprises, such as the Government National Mortgage Association ("GNMA" or "Ginnie Mae"), the Federal National Mortgage Association ("FNMA" or "Fannie Mae") or the Federal Home Loan Mortgage Corporation ("FHLMC" or "Freddie Mac"). The Fund will invest in a broad array of mortgage-related securities in seeking to generate consistent, absolute returns across full market cycles. The remaining 20% of the Fund's assets may be invested in other types of "Fixed Income Instruments," which include bonds, debt securities and other similar instruments issued by various U.S. and non-U.S. public- or private sector entities. The average portfolio duration of this Fund normally varies from (negative) 1 year to positive 8 years based on PIMCO's 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 up to 50% of its total assets in high yield securities ("junk bonds") that are rated Caa or higher by Moody's Investors Service, Inc. ("Moody's"), or equivalently rated by Standard & Poor's Rating Services ("S&P") or Fitch, Inc. ("Fitch"), or, if unrated, determined by Pacific Investment Management Company LLC ("PIMCO") to be of comparable quality (except such limitation shall not apply to the Fund's investments in mortgage-related securities). The Fund is non-diversified, which means that it may invest its assets in a smaller number of issuers than a diversified fund.

The Fund may invest, without limitation, in derivative instruments, such as options, futures contracts, options on futures, fixed income swap agreements, credit default swap agreements and other synthetic mortgage-related swap indices, 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 invest up to 10% of its total assets in any combination of mortgage-related or other asset-backed interest-only ("IO"), principal-only ("PO"), or inverse floating rate debt ("inverse floater") securities. The Fund may purchase or sell securities on a when-issued, delayed delivery or forward commitment basis and may engage in short sales. The Fund may, 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.

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

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 and liquidity risks. High yield securities are considered primarily speculative with respect to the issuer's continuing ability to make principal and interest payments

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

Derivatives Risk: the risk of investing in derivative instruments, including liquidity, interest rate, market, credit and management risks, mispricing or improper valuation. Changes in the value of the derivative may not correlate perfectly with the underlying asset, rate or index, and the Fund could lose more than the principal amount invested

Mortgage-Related and Other Asset-Backed Risk: the risk of investing in mortgage-related and other asset-backed securities, including interest rate risk, extension risk and prepayment risk

Extension Risk: the risk that, in periods of rising interest rates, issuers of mortgage-related and other asset-backed securities may pay principal later than expected, which may reduce the value of the Fund's investment in such securities and may prevent the Fund from receiving higher interest rates on proceeds reinvested

Prepayment Risk: the risk that, in periods of declining interest rates, issuers of mortgage-related and other asset-backed securities may pay principal more quickly than expected, which results in the Fund foregoing future interest income on the portion of the principal repaid early and may result in the Fund being forced to reinvest investment proceeds at lower interest rates

Privately Issued Mortgage-Related Securities Risk: the risk of non-payment because there are no direct or indirect government or agency guarantees of payments in the pools created by non-governmental issuers

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, causing the Fund to be more volatile than if it had not been leveraged

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 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

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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 Nondiversified Status [Text]

rr_RiskNondiversifiedStatus

Issuer Non-Diversification Risk: the risk of focusing investments in a small number of issuers, including being more susceptible to risks associated with a single economic, political or regulatory occurrence than a more diversified portfolio might be. Funds that are "non-diversified" may invest a greater percentage of their assets in the securities of a single issuer (such as bonds issued by a particular foreign government) than funds that are "diversified"

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

The Fund's benchmark index is the 3-Month USD LIBOR Index. LIBOR (London Interbank Offered Rate) is an average interest rate, determined by the British Bankers Association that banks charge one another for the use of short-term money (3 months) in England's Eurodollar market.

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 Mortgage Opportunities Fund - Retail) | | Class A

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

3.75%

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

0.75%

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

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.15%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.00%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

473

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

681

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

473

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

681

(PIMCO Mortgage Opportunities Fund - Retail) | | Class C

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

1.00%

Management Fees

rr_ManagementFeesOverAssets

0.75%

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

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.90%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.75%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

278

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

551

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

178

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

551

(PIMCO Mortgage Opportunities Fund - Retail) | | Class R

Risk/Return:

rr_RiskReturnAbstract

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

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

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

rr_MaximumDeferredSalesChargeOverOther

none

Management Fees

rr_ManagementFeesOverAssets

0.75%

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

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.15%

^[1]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.40%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.15%)

^[2]

Total Annual Fund Operating Expenses After Expense Reimbursement

rr_NetExpensesOverAssets

1.25%

Expense Example, with Redemption, 1 Year

rr_ExpenseExampleYear01

127

Expense Example, with Redemption, 3 Years

rr_ExpenseExampleYear03

397

Expense Example, No Redemption, 1 Year

rr_ExpenseExampleNoRedemptionYear01

127

Expense Example, No Redemption, 3 Years

rr_ExpenseExampleNoRedemptionYear03

397

[1] "Other Expenses" reflect estimated organizational expenses for the Fund's first fiscal year.

[2] PIMCO has contractually agreed, through July 31, 2014, 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 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.

[3] PIMCO has contractually agreed, through July 31, 2014, 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 Institutional Class, Class P, Administrative Class and Class D 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.