0001104659-13-071592.txt : 20130923 0001104659-13-071592.hdr.sgml : 20130923 20130923130120 ACCESSION NUMBER: 0001104659-13-071592 CONFORMED SUBMISSION TYPE: 497 PUBLIC DOCUMENT COUNT: 7 FILED AS OF DATE: 20130923 DATE AS OF CHANGE: 20130923 EFFECTIVENESS DATE: 20130923 FILER: COMPANY DATA: COMPANY CONFORMED NAME: MORGAN STANLEY MORTGAGE SECURITIES TRUST CENTRAL INDEX KEY: 0000806564 IRS NUMBER: 000000000 STATE OF INCORPORATION: MA FISCAL YEAR END: 1031 FILING VALUES: FORM TYPE: 497 SEC ACT: 1933 Act SEC FILE NUMBER: 033-10363 FILM NUMBER: 131109723 BUSINESS ADDRESS: STREET 1: 522 FIFTH AVENUE CITY: NEW YORK STATE: NY ZIP: 10036 BUSINESS PHONE: 800-869-6397 MAIL ADDRESS: STREET 1: 522 FIFTH AVENUE CITY: NEW YORK STATE: NY ZIP: 10036 FORMER COMPANY: FORMER CONFORMED NAME: MORGAN STANLEY FEDERAL SECURITIES TRUST DATE OF NAME CHANGE: 20010618 FORMER COMPANY: FORMER CONFORMED NAME: MORGAN STANLEY DEAN WITTER FEDERAL SECURITIES TRUST DATE OF NAME CHANGE: 19980622 FORMER COMPANY: FORMER CONFORMED NAME: WITTER DEAN FEDERAL SECURITIES TRUST DATE OF NAME CHANGE: 19930210 0000806564 S000002467 Morgan Stanley Mortgage Securities Trust C000006611 A MTGAX C000006612 B MTGBX C000006613 L MTGCX C000006614 I MTGDX 497 1 a13-17755_11497.htm 497

 

MORGAN STANLEY MORTGAGE SECURITIES TRUST

522 Fifth Avenue

New York, New York 10036

 

VIA EDGAR

 

September 23, 2013

 

Securities and Exchange Commission

100 F Street, N.E.

Washington, D.C. 20549

 

Re:                             Morgan Stanley Mortgage Securities Trust

File Nos. 33-10363; 811-4917

 

Ladies and Gentlemen:

 

On behalf of Morgan Stanley Mortgage Securities Trust (“Registrant”), we hereby submit for filing pursuant to Rule 497(e) under the Securities Act of 1933, as amended, exhibits containing interactive data format risk/return summary information for the Registrant. These exhibits contain the risk/return summary information in the prospectus for the Registrant dated February 28, 2013. The purpose of this filing is to submit the XBRL information from the 497(e) filing August 30, 2013 for the Registrant.

 

If you have any questions, please feel free to contact me at 212.296.6983 (tel.) or 646.452.4799 (fax).

 

 

Very truly yours,

 

 

 

/s/ Tara A. Farrelly

 

Tara A. Farrelly

 

Assistant Secretary

 

Enclosures

cc: Stefanie V. Chang Yu, Esq.

 


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The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change. The Fund's "Adviser," Morgan Stanley Investment Management Inc., and its "Administrator," Morgan Stanley Services Company Inc., have agreed to reduce its advisory fee, its administration fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class A, 1.70% for Class B, 1.30% for Class L and 0.70% for Class I. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate. 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Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false224false 4rr_ExpenseExampleNoRedemptionYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue954954USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false225false 4rr_ExpenseExampleNoRedemptionYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue15981598USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false226false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse3false USDtruefalse$S000002467Member_C000006612Memberhttp://www.sec.gov/CIK0000806564duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseBrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006612Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse027true 3rr_RiskReturnAbstractrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse028false 4rr_ManagementFeesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00470.0047falsefalsefalserr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph a false029false 4rr_DistributionAndService12b1FeesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00850.0085[1]falsefalsefalserr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 9 false030false 4rr_OtherExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00560.0056falsefalsefalserr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph c -Clause i false031false 4rr_ExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.01880.0188[2]falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph d false032false 4rr_FeeWaiverOrReimbursementOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue-0.0018-0.0018[2]falsefalsefalserr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false033false 4rr_NetExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.01700.0170[2]falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false034false 4rr_ExpenseExampleYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue673673USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 false235false 4rr_ExpenseExampleYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue836836USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false236false 4rr_ExpenseExampleYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue11231123USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false237false 4rr_ExpenseExampleYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue18231823USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false238false 4rr_ExpenseExampleNoRedemptionYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue173173USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false239false 4rr_ExpenseExampleNoRedemptionYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue536536USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false240false 4rr_ExpenseExampleNoRedemptionYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue923923USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false241false 4rr_ExpenseExampleNoRedemptionYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue18231823USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false242false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse4false USDtruefalse$S000002467Member_C000006613Memberhttp://www.sec.gov/CIK0000806564duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseLrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006613Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse043true 3rr_RiskReturnAbstractrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse044false 4rr_ManagementFeesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00470.0047[3]falsefalsefalserr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph a false045false 4rr_DistributionAndService12b1FeesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00500.0050[1],[3]falsefalsefalserr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 9 false046false 4rr_OtherExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00560.0056[3]falsefalsefalserr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph c -Clause i false047false 4rr_ExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.01530.0153[2],[3]falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph d false048false 4rr_FeeWaiverOrReimbursementOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue-0.0023-0.0023[2],[3]falsefalsefalserr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false049false 4rr_NetExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.01300.0130[2],[3]falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false050false 4rr_ExpenseExampleYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue132132[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 false251false 4rr_ExpenseExampleYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue412412[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false252false 4rr_ExpenseExampleYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue713713[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false253false 4rr_ExpenseExampleYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue15681568[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false254false 4rr_ExpenseExampleNoRedemptionYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue132132[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false255false 4rr_ExpenseExampleNoRedemptionYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue412412[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false256false 4rr_ExpenseExampleNoRedemptionYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue713713[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false257false 4rr_ExpenseExampleNoRedemptionYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue15681568[3]USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false258false 0truefalsetruefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalse5false USDtruefalse$S000002467Member_C000006614Memberhttp://www.sec.gov/CIK0000806564duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseIrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006614Memberrr_ProspectusShareClassAxisexplicitMemberpureStandardhttp://www.xbrl.org/2003/instancepurexbrli0usdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170USDUSD$nanafalse059true 3rr_RiskReturnAbstractrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse060false 4rr_ManagementFeesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00470.0047falsefalsefalserr:NonNegativePure4TypepureManagement Fees include investment advisory fees (including any fees based on the Fund's performance), any other management fees payable to the investment adviser or its affiliates, and administrative fees payable to the investment adviser or its affiliates that are not included as "Other Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph a false061false 4rr_DistributionAndService12b1FeesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00000.0000[1]falsefalsefalserr:NonNegativePure4TypepureDistribution [and/or Service] (12b-1) Fees" include all distribution or other expenses incurred during the most recent fiscal year under a plan adopted pursuant to rule 12b-1 [17 CFR 270.12b-1]. Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 9 false062false 4rr_OtherExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00560.0056falsefalsefalserr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph c -Clause i false063false 4rr_ExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.01030.0103[2]falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph d false064false 4rr_FeeWaiverOrReimbursementOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue-0.0033-0.0033[2]falsefalsefalserr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false065false 4rr_NetExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00700.0070[2]falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false066false 4rr_ExpenseExampleYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue7272USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 false267false 4rr_ExpenseExampleYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue224224USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false268false 4rr_ExpenseExampleYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue390390USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false269false 4rr_ExpenseExampleYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue871871USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false270false 4rr_ExpenseExampleNoRedemptionYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue7272USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false271false 4rr_ExpenseExampleNoRedemptionYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue224224USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false272false 4rr_ExpenseExampleNoRedemptionYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue390390USD$falsefalsefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false273false 4rr_ExpenseExampleNoRedemptionYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truefalsetrue871871USD$falsetruefalserr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false21The Board of Trustees approved an amendment to the Plan of Distribution reducing the distribution and shareholder services (12b-1) fee for the Fund's Class L shares from 0.85% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change.2The Fund's "Adviser," Morgan Stanley Investment Management Inc., and its "Administrator," Morgan Stanley Services Company Inc., have agreed to reduce its advisory fee, its administration fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class A, 1.70% for Class B, 1.30% for Class L and 0.70% for Class I. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.3Effective February 25, 2013, Class C shares were renamed Class L shares.falseRisk/Return Detail Data - Morgan Stanley Mortgage Securities Trust (Morgan Stanley Mortgage Securities Trust, USD $)NoRoundingUnKnownUnKnownUnKnowntruefalsefalseSheethttp://morganstanley.com/20130830/role/DisclosureRiskReturnDetailDataElementsMorganStanleyMortgageSecuritiesTrust173 XML 9 Show.js IDEA: XBRL DOCUMENT /** * Rivet Software Inc. * * @copyright Copyright (c) 2006-2011 Rivet Software, Inc. 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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] ck0000806564_SupplementTextBlock

August 30, 2013


Supplement


SUPPLEMENT DATED AUGUST 30, 2013 TO THE PROSPECTUS OF
MORGAN STANLEY MORTGAGE SECURITIES TRUST
Dated February 28, 2013


The following changes to the Prospectus are effective September 16, 2013:

Risk/Return [Heading] rr_RiskReturnHeading Morgan Stanley Mortgage Securities Trust
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following replaces the "Annual Fund Operating Expenses" table and related footnotes in the section of the Prospectus entitled "Fund Summary—Fees and Expenses—Annual Fund Operating Expenses:"

Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent The Board of Trustees approved an amendment to the Plan of Distribution reducing the distribution and shareholder services (12b-1) fee for the Fund's Class L shares from 0.85% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change.
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The following replaces the "Example" tables and related footnote in the section of the Prospectus entitled "Fund Summary—Example:"

Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If You SOLD Your Shares:
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If You HELD Your Shares:
Expense Example Closing [Text Block] rr_ExpenseExampleClosingTextBlock

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

A
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.47%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Other Expenses rr_OtherExpensesOverAssets 0.56%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.28% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.28%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 523
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 730
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 954
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,598
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 523
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 730
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 954
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,598
B
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.47%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.85% [1]
Other Expenses rr_OtherExpensesOverAssets 0.56%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.88% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.18%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.70% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 673
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 836
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,123
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,823
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 173
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 536
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 923
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,823
L
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.47% [3]
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets 0.50% [1],[3]
Other Expenses rr_OtherExpensesOverAssets 0.56% [3]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.53% [2],[3]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.23%) [2],[3]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.30% [2],[3]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 132 [3]
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 412 [3]
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 713 [3]
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,568 [3]
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 132 [3]
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 412 [3]
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 713 [3]
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,568 [3]
I
 
Risk/Return: rr_RiskReturnAbstract  
Advisory Fee rr_ManagementFeesOverAssets 0.47%
Distribution and/or Shareholder Service (12b-1) Fee rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.56%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.03% [2]
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.33%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 0.70% [2]
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 72
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 224
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 390
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 871
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 72
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 224
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 390
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 $ 871
[1] The Board of Trustees approved an amendment to the Plan of Distribution reducing the distribution and shareholder services (12b-1) fee for the Fund's Class L shares from 0.85% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change.
[2] The Fund's "Adviser," Morgan Stanley Investment Management Inc., and its "Administrator," Morgan Stanley Services Company Inc., have agreed to reduce its advisory fee, its administration fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class A, 1.70% for Class B, 1.30% for Class L and 0.70% for Class I. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.
[3] Effective February 25, 2013, Class C shares were renamed Class L shares.
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Under an appropriate caption or a subcaption of "Other Expenses," disclose the amount of any distribution or similar expenses deducted from the Fund's assets other than pursuant to a rule 12b-1 plan.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 9 false03falseRowprimaryElement*5false 4rr_OtherExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabelrr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph c -Clause i false0 0rr_OtherExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel1truetruetrue0.00560.0056falsefalsefalse2truetruetrue0.00560.0056falsefalsefalse3truetruetrue0.00560.0056[1]falsefalsefalse4truetruetrue0.00560.0056falsefalsefalserr:NonNegativePure4Typepure"Other Expenses" include all expenses not otherwise disclosed in the table that are deducted from the Fund's assets or charged to all shareholder accounts. The amount of expenses deducted from the Fund's assets are the amounts shown as expenses in the Fund's statement of operations (including increases resulting from complying with paragraph 2(g) of rule 6-07 of Regulation S-X [17 CFR 210.6-07]). "Other Expenses" do not include extraordinary expenses as determined under generally accepted accounting principles (see Accounting Principles Board Opinion No. 30). If extraordinary expenses were incurred that materially affected the Fund's "Other Expenses," disclose in a footnote to the table what "Other Expenses" would have been had the extraordinary expenses been included.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph c -Clause i false04falseRowprimaryElement*6false 4rr_ExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabelrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph d false0 0rr_ExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel[3]1truetruetrue0.01280.0128falsefalsefalse2truetruetrue0.01880.0188falsefalsefalse3truetruetrue0.01530.0153[1]falsefalsefalse4truetruetrue0.01030.0103falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses. If the Fund is a Feeder Fund, reflect the aggregate expenses of the Feeder Fund and the Master Fund in a single fee table using the captions provided. In a footnote to the fee table, state that the table and Example reflect the expenses of both the Feeder and Master Funds. If the prospectus offers more than one Class of a Multiple Class Fund or more than one Feeder Fund that invests in the same Master Fund, provide a separate response for each Class or Feeder Fund. Base the percentages of "Annual Fund Operating Expenses" on amounts incurred during the Fund's most recent fiscal year, but include in expenses amounts that would have been incurred absent expense reimbursement or fee waiver arrangements. If the Fund has changed its fiscal year and, as a result, the most recent fiscal year is less than three months, use the fiscal year prior to the most recent fiscal year as the basis for determining "Annual Fund Operating Expenses."Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 3 -Subparagraph d false05falseRowprimaryElement*7false 4rr_FeeWaiverOrReimbursementOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabelrr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false0 0rr_FeeWaiverOrReimbursementOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsetruenegatedLabel[3]1truetruetrue0.00280.0028falsefalsefalse2truetruetrue0.00180.0018falsefalsefalse3truetruetrue0.00230.0023[1]falsefalsefalse4truetruetrue0.00330.0033falsefalsefalserr:NonPositivePure4TypepureTotal Annual Fund Operating Expenses. If there were expense reimbursement or fee waiver arrangements that reduced any Fund operating expenses and will continue to reduce them for no less than one year from the effective date of the Fund's registration statement, a Fund may add two captions to the table one caption showing the amount of the expense reimbursement or fee waiver, and a second caption showing the Fund's net expenses after subtracting the fee reimbursement or expense waiver from the total fund operating expenses. The Fund should place these additional captions directly below the "Total Annual Fund Operating Expenses" caption of the table and should use appropriate descriptive captions, such as "Fee Waiver [and/or Expense Reimbursement]" and "Total Annual Fund Operating Expenses After Fee Waiver [and/or Expense Reimbursement]," respectively. If the Fund provides this disclosure, also disclose the period for which the expense reimbursement or fee waiver arrangement is expected to continue, and briefly describe who can terminate the arrangement and under what circumstances.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false06falseRowprimaryElement*8false 4rr_NetExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabelrr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false0 0rr_NetExpensesOverAssetsrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalselabel[3]1truetruetrue0.01000.0100falsefalsefalse2truetruetrue0.01700.0170falsefalsefalse3truetruetrue0.01300.0130[1]falsefalsefalse4truetruetrue0.00700.0070falsefalsefalserr:NonNegativePure4TypepureTotal Annual Fund Operating Expenses.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection table -Paragraph 1 -Subparagraph 11 false01Effective February 25, 2013, Class C shares were renamed Class L shares.2The Board of Trustees approved an amendment to the Plan of Distribution reducing the distribution and shareholder services (12b-1) fee for the Fund's Class L shares from 0.85% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change.3The Fund's "Adviser," Morgan Stanley Investment Management Inc., and its "Administrator," Morgan Stanley Services Company Inc., have agreed to reduce its advisory fee, its administration fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class A, 1.70% for Class B, 1.30% for Class L and 0.70% for Class I. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.falseAnnual Fund Operating Expenses Morgan Stanley Mortgage Securities TrustUnKnownUnKnownUnKnownUnKnownfalsefalsefalseSheet46182046034ColumnperiodPeriod*Columndei_LegalEntityAxisAxisck0000806564_S000002467MemberColumnrr_ProspectusShareClassAxisAxis*ColumnunitUnit*RowprimaryElement*falsenonnum:textBlockItemTypenaContains a command for the SEC Viewer for the role corresponding to OperatingExpensesData.No definition available.false06false 4rr_ExpenseExampleNarrativeTextBlockrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style="margin:0pt 0pt 10pt 0pt;"> <font style="font-size:10pt; font-family: Arial, Helvetica;">The following replaces the "Example" tables and related footnote in the section of the</font> <font style="font-size:10pt; font-family: Arial, Helvetica;"><i>Prospectus</i></font> <font style="font-size:10pt; font-family: Arial, Helvetica;">entitled "Fund Summary&#8212;Example:"</font> </p>falsefalsefalsenonnum:textBlockItemTypenaThe Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 1 false07false 4rr_ExpenseExampleByYearCaptionrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 If You SOLD Your Shares: falsefalsefalsexbrli:stringItemTypestringThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false08false 4rr_ExpenseExampleWithRedemptionTableTextBlockrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00~ http://morganstanley.com/20130830/role/ScheduleExpenseExampleTransposed20002 column dei_LegalEntityAxis compact ck0000806564_S000002467Member row primary compact * ~falsefalse~ http://morganstanley.com/20130830/role/ScheduleExpenseExampleTransposed20002 column dei_LegalEntityAxis compact ck0000806564_S000002467Member row primary compact * ~truehttp://morganstanley.com/20130830/role/ScheduleExpenseExampleTransposed20002020002 - Schedule - Expense Example {Transposed}truefalsefalse1falseColumnprimaryElement*3false 4rr_ExpenseExampleYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 false2 USDfalsefalse$2falseColumnprimaryElement*4false 4rr_ExpenseExampleYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false2 USDfalsefalse$3falseColumnprimaryElement*5false 4rr_ExpenseExampleYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false2 USDfalsefalse$4falseColumnprimaryElement*6false 4rr_ExpenseExampleYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryThe Example assumes that you invest $10,000 in the Fund for the time periods indicated and then you redeem all of your shares at the end of those periods. The Example also assumes that your investment has a 5% return per year and that the Fund's operating expenses remained the same. Although your actual costs may be higher or lower.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 1 -Subparagraph 2 false2 USDfalsefalse$1falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseArr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006611Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustAusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue523523falsefalsefalse2truefalsetrue730730falsefalsefalse3truefalsetrue954954falsefalsefalse4truefalsetrue15981598falsefalsefalsenanafalse02falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseBrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006612Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustBusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue673673falsefalsefalse2truefalsetrue836836falsefalsefalse3truefalsetrue11231123falsefalsefalse4truefalsetrue18231823falsefalsefalsenanafalse03falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseLrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006613Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustLusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse[1]1truefalsetrue132132falsefalsefalse2truefalsetrue412412falsefalsefalse3truefalsetrue713713falsefalsefalse4truefalsetrue15681568falsefalsefalsenanafalse04falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseIrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006614Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustIusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue7272falsefalsefalse2truefalsetrue224224falsefalsefalse3truefalsetrue390390falsefalsefalse4truefalsetrue871871falsefalsefalsenanafalse01Effective February 25, 2013, Class C shares were renamed Class L shares.falseExpense Example Morgan Stanley Mortgage Securities Trust (USD $)UnKnownUnKnownUnKnownUnKnownfalsefalsefalseSheet44121244044ColumnprimaryElement*RowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsenonnum:textBlockItemTypenaContains a command for the SEC Viewer for the role corresponding to ExpenseExample.No definition available.false09false 4rr_ExpenseExampleNoRedemptionByYearCaptionrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00 If You HELD Your Shares: falsefalsefalsexbrli:stringItemTypestringYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false010false 4rr_ExpenseExampleNoRedemptionTableTextBlockrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00~ http://morganstanley.com/20130830/role/ScheduleExpenseExampleNoRedemptionTransposed20003 column dei_LegalEntityAxis compact ck0000806564_S000002467Member row primary compact * ~falsefalse~ http://morganstanley.com/20130830/role/ScheduleExpenseExampleNoRedemptionTransposed20003 column dei_LegalEntityAxis compact ck0000806564_S000002467Member row primary compact * ~truehttp://morganstanley.com/20130830/role/ScheduleExpenseExampleNoRedemptionTransposed20003020003 - Schedule - Expense Example No Redemption {Transposed}truefalsefalse1falseColumnprimaryElement*3false 4rr_ExpenseExampleNoRedemptionYear01rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false2 USDfalsefalse$2falseColumnprimaryElement*4false 4rr_ExpenseExampleNoRedemptionYear03rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection example -Paragraph 2 -Subparagraph 1 false2 USDfalsefalse$3falseColumnprimaryElement*5false 4rr_ExpenseExampleNoRedemptionYear05rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false2 USDfalsefalse$4falseColumnprimaryElement*6false 4rr_ExpenseExampleNoRedemptionYear10rr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabelrr:NonNegativeMonetaryTypemonetaryYou would pay the following expenses if you did not redeem your shares. Include the second 1-, 3-, 5-, and 10-year periods and related narrative explanation only if a sales charge (load) or other fee is charged upon redemption.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Form -Number N-1A -Chapter A -Section 3 -Subsection instructions -Paragraph 4 -Subparagraph f false2 USDfalsefalse$1falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseArr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006611Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustAusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue523523falsefalsefalse2truefalsetrue730730falsefalsefalse3truefalsetrue954954falsefalsefalse4truefalsetrue15981598falsefalsefalsenanafalse02falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseBrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006612Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustBusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue173173falsefalsefalse2truefalsetrue536536falsefalsefalse3truefalsetrue923923falsefalsefalse4truefalsetrue18231823falsefalsefalsenanafalse03falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseLrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006613Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustLusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse[1]1truefalsetrue132132falsefalsefalse2truefalsetrue412412falsefalsefalse3truefalsetrue713713falsefalsefalse4truefalsetrue15681568falsefalsefalsenanafalse04falseRowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*duration2013-08-30T00:00:002013-08-30T00:00:00falsefalseMorgan Stanley Mortgage Securities Trustdei_LegalEntityAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_S000002467Memberdei_LegalEntityAxisexplicitMemberfalsefalseIrr_ProspectusShareClassAxisxbrldihttp://xbrl.org/2006/xbrldick0000806564_C000006614Memberrr_ProspectusShareClassAxisexplicitMemberMorgan Stanley Mortgage Securities TrustIusdStandardhttp://www.xbrl.org/2003/iso4217USDiso42170 0truefalsefalsefalsefalsefalsefalsefalsefalse1truefalsetrue7272falsefalsefalse2truefalsetrue224224falsefalsefalse3truefalsetrue390390falsefalsefalse4truefalsetrue871871falsefalsefalsenanafalse01Effective February 25, 2013, Class C shares were renamed Class L shares.falseExpense Example No Redemption Morgan Stanley Mortgage Securities Trust (USD $)UnKnownUnKnownUnKnownUnKnownfalsefalsefalseSheet44121244044ColumnprimaryElement*RowperiodPeriod*Rowdei_LegalEntityAxisAxisck0000806564_S000002467MemberRowrr_ProspectusShareClassAxisAxis*RowunitUnit*falsenonnum:textBlockItemTypenaContains a command for the SEC Viewer for the role corresponding to ExpenseExampleNoRedemption.No definition available.false011false 4rr_ExpenseExampleClosingTextBlockrr_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalse1falsefalsefalse00<p style="margin: 8pt 0pt 10pt 0pt;" align="center"> <font style="font-size: 10pt; font-family: Arial, Helvetica;">PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.</font> </p> falsefalsefalsenonnum:textBlockItemTypenaThe Example does not reflect sales charges (loads) on reinvested dividends [and other distributions]. 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Morgan Stanley Mortgage Securities Trust
Morgan Stanley Mortgage Securities Trust

August 30, 2013


Supplement


SUPPLEMENT DATED AUGUST 30, 2013 TO THE PROSPECTUS OF
MORGAN STANLEY MORTGAGE SECURITIES TRUST
Dated February 28, 2013


The following changes to the Prospectus are effective September 16, 2013:

The following replaces the "Annual Fund Operating Expenses" table and related footnotes in the section of the Prospectus entitled "Fund Summary—Fees and Expenses—Annual Fund Operating Expenses:"

Annual Fund Operating Expenses Morgan Stanley Mortgage Securities Trust
A
B
L
I
Advisory Fee 0.47% 0.47% 0.47% [1] 0.47%
Distribution and/or Shareholder Service (12b-1) Fee [2] 0.25% 0.85% 0.50% [1] none
Other Expenses 0.56% 0.56% 0.56% [1] 0.56%
Total Annual Fund Operating Expenses [3] 1.28% 1.88% 1.53% [1] 1.03%
Fee Waiver and/or Expense Reimbursement [3] 0.28% 0.18% 0.23% [1] 0.33%
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement [3] 1.00% 1.70% 1.30% [1] 0.70%
[1] Effective February 25, 2013, Class C shares were renamed Class L shares.
[2] The Board of Trustees approved an amendment to the Plan of Distribution reducing the distribution and shareholder services (12b-1) fee for the Fund's Class L shares from 0.85% to 0.50% of the average daily net assets of such Class, effective February 25, 2013. The Distribution and/or Shareholder Service (12b-1) Fee shown in the table above has been restated to reflect such change.
[3] The Fund's "Adviser," Morgan Stanley Investment Management Inc., and its "Administrator," Morgan Stanley Services Company Inc., have agreed to reduce its advisory fee, its administration fee and/or reimburse the Fund so that Total Annual Fund Operating Expenses, excluding certain investment related expenses, taxes, interest and other extraordinary expenses (including litigation), will not exceed 1.00% for Class A, 1.70% for Class B, 1.30% for Class L and 0.70% for Class I. The fee waivers and/or expense reimbursements will continue for at least one year or until such time as the Fund's Board of Trustees acts to discontinue all or a portion of such waivers and/or reimbursements when it deems such action is appropriate.

The following replaces the "Example" tables and related footnote in the section of the Prospectus entitled "Fund Summary—Example:"

If You SOLD Your Shares:
Expense Example Morgan Stanley Mortgage Securities Trust (USD $)
1 Year
3 Years
5 Years
10 Years
A
523 730 954 1,598
B
673 836 1,123 1,823
L
[1] 132 412 713 1,568
I
72 224 390 871
[1] Effective February 25, 2013, Class C shares were renamed Class L shares.
If You HELD Your Shares:
Expense Example No Redemption Morgan Stanley Mortgage Securities Trust (USD $)
1 Year
3 Years
5 Years
10 Years
A
523 730 954 1,598
B
173 536 923 1,823
L
[1] 132 412 713 1,568
I
72 224 390 871
[1] Effective February 25, 2013, Class C shares were renamed Class L shares.

PLEASE RETAIN THIS SUPPLEMENT FOR FUTURE REFERENCE.

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Risk/Return: rr_RiskReturnAbstract  
Prospectus Date rr_ProspectusDate Feb. 28, 2013
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Document and Entity Information
0 Months Ended
Aug. 30, 2013
Risk/Return:  
Document Type 497
Document Period End Date Aug. 30, 2013
Registrant Name MORGAN STANLEY MORTGAGE SECURITIES TRUST
Central Index Key 0000806564
Amendment Flag false
Document Creation Date Aug. 30, 2013
Document Effective Date Aug. 30, 2013
Prospectus Date Feb. 28, 2013
Morgan Stanley Mortgage Securities Trust | A
 
Risk/Return:  
Trading Symbol MTGAX
Morgan Stanley Mortgage Securities Trust | B
 
Risk/Return:  
Trading Symbol MTGBX
Morgan Stanley Mortgage Securities Trust | L
 
Risk/Return:  
Trading Symbol MTGCX
Morgan Stanley Mortgage Securities Trust | I
 
Risk/Return:  
Trading Symbol MTGDX
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