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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName OPPENHEIMER ROCHESTER FUND MUNICIPALS
Prospectus Date rr_ProspectusDate Mar. 28, 2016
Supplement [Text Block] orfm_SupplementTextBlock

OPPENHEIMER ROCHESTER® FUND MUNICIPALS


Supplement dated January 30, 2017 to the

Statutory Prospectus dated March 28, 2016



This supplement amends the Statutory Prospectus of Oppenheimer Rochester Fund Municipals (the “Fund”), and is in addition to any other supplement(s).

Effective April 1, 2017:

1.In the section titled “Fees and Expenses of the Fund,” the table titled “Annual Fund Operating Expenses” is deleted in its entirety and replaced with the following:

Annual Fund Operating Expenses1
(expenses that you pay each year as a percentage of the value of your investment)
 
 
Class A
 
 
Class B
 
 
Class C
 
 
Class Y
Management Fees0.46%0.46%0.46%0.46%
Distribution and/or Service (12b-1) Fees0.25%1.00%1.00%None
Other Expenses    
     Interest and Fees from Borrowings0.05%0.05%0.05%0.05%
     Interest and Related Expenses from Inverse Floaters0.08%0.08%0.08%0.08%
     Other Expenses0.15%0.15%0.15%0.15%
Total Other Expenses0.28%0.28%0.28%0.28%
Total Annual Fund Operating Expenses0.99%1.74%1.74%0.74%

1.Expenses have been restated to reflect current fees.


2.In the section titled “Fees and Expenses of the Fund,” the table that appears in the sub-section titled “Example,” is deleted in its entirety and replaced with the following:


If shares are redeemedIf shares are not redeemed
 1 Year3 Years5 Years10 Years1 Year3 Years5 Years10 Years
Class A$572$777$999$1,636$572$777$999$1,636
Class B$678$853$1,152$1,684$178$553$952$1,684
Class C$278$553$952$2,069$178$553$952$2,069
Class Y$76$237$413$922$76$237$413$922
OPPENHEIMER ROCHESTER FUND MUNICIPALS  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] orfm_SupplementTextBlock

OPPENHEIMER ROCHESTER® FUND MUNICIPALS


Supplement dated January 30, 2017 to the

Statutory Prospectus dated March 28, 2016



This supplement amends the Statutory Prospectus of Oppenheimer Rochester Fund Municipals (the “Fund”), and is in addition to any other supplement(s).

Effective April 1, 2017:

1.In the section titled “Fees and Expenses of the Fund,” the table titled “Annual Fund Operating Expenses” is deleted in its entirety and replaced with the following:

Annual Fund Operating Expenses1
(expenses that you pay each year as a percentage of the value of your investment)
 
 
Class A
 
 
Class B
 
 
Class C
 
 
Class Y
Management Fees0.46%0.46%0.46%0.46%
Distribution and/or Service (12b-1) Fees0.25%1.00%1.00%None
Other Expenses    
     Interest and Fees from Borrowings0.05%0.05%0.05%0.05%
     Interest and Related Expenses from Inverse Floaters0.08%0.08%0.08%0.08%
     Other Expenses0.15%0.15%0.15%0.15%
Total Other Expenses0.28%0.28%0.28%0.28%
Total Annual Fund Operating Expenses0.99%1.74%1.74%0.74%

1.Expenses have been restated to reflect current fees.


2.In the section titled “Fees and Expenses of the Fund,” the table that appears in the sub-section titled “Example,” is deleted in its entirety and replaced with the following:


If shares are redeemedIf shares are not redeemed
 1 Year3 Years5 Years10 Years1 Year3 Years5 Years10 Years
Class A$572$777$999$1,636$572$777$999$1,636
Class B$678$853$1,152$1,684$178$553$952$1,684
Class C$278$553$952$2,069$178$553$952$2,069
Class Y$76$237$413$922$76$237$413$922
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)
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Expenses have been restated to reflect current fees.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption If shares are redeemed
Expense Example, No Redemption, By Year, Caption [Text] rr_ExpenseExampleNoRedemptionByYearCaption If shares are not redeemed
OPPENHEIMER ROCHESTER FUND MUNICIPALS | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.46% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25% [1]
Interest and Fees from Borrowings rr_Component1OtherExpensesOverAssets 0.05% [1]
Interest and Related Expenses from Inverse Floaters rr_Component2OtherExpensesOverAssets 0.08% [1]
Other Expenses rr_Component3OtherExpensesOverAssets 0.15% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.28% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.99% [1]
1 Year rr_ExpenseExampleYear01 $ 572
3 Years rr_ExpenseExampleYear03 777
5 Years rr_ExpenseExampleYear05 999
10 Years rr_ExpenseExampleYear10 1,636
1 Year rr_ExpenseExampleNoRedemptionYear01 572
3 Years rr_ExpenseExampleNoRedemptionYear03 777
5 Years rr_ExpenseExampleNoRedemptionYear05 999
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,636
OPPENHEIMER ROCHESTER FUND MUNICIPALS | Class B  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.46% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00% [1]
Interest and Fees from Borrowings rr_Component1OtherExpensesOverAssets 0.05% [1]
Interest and Related Expenses from Inverse Floaters rr_Component2OtherExpensesOverAssets 0.08% [1]
Other Expenses rr_Component3OtherExpensesOverAssets 0.15% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.28% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.74% [1]
1 Year rr_ExpenseExampleYear01 $ 678
3 Years rr_ExpenseExampleYear03 853
5 Years rr_ExpenseExampleYear05 1,152
10 Years rr_ExpenseExampleYear10 1,684
1 Year rr_ExpenseExampleNoRedemptionYear01 178
3 Years rr_ExpenseExampleNoRedemptionYear03 553
5 Years rr_ExpenseExampleNoRedemptionYear05 952
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,684
OPPENHEIMER ROCHESTER FUND MUNICIPALS | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.46% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00% [1]
Interest and Fees from Borrowings rr_Component1OtherExpensesOverAssets 0.05% [1]
Interest and Related Expenses from Inverse Floaters rr_Component2OtherExpensesOverAssets 0.08% [1]
Other Expenses rr_Component3OtherExpensesOverAssets 0.15% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.28% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.74% [1]
1 Year rr_ExpenseExampleYear01 $ 278
3 Years rr_ExpenseExampleYear03 553
5 Years rr_ExpenseExampleYear05 952
10 Years rr_ExpenseExampleYear10 2,069
1 Year rr_ExpenseExampleNoRedemptionYear01 178
3 Years rr_ExpenseExampleNoRedemptionYear03 553
5 Years rr_ExpenseExampleNoRedemptionYear05 952
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,069
OPPENHEIMER ROCHESTER FUND MUNICIPALS | Class Y  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.46% [1]
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Interest and Fees from Borrowings rr_Component1OtherExpensesOverAssets 0.05% [1]
Interest and Related Expenses from Inverse Floaters rr_Component2OtherExpensesOverAssets 0.08% [1]
Other Expenses rr_Component3OtherExpensesOverAssets 0.15% [1]
Total Other Expenses rr_OtherExpensesOverAssets 0.28% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.74% [1]
1 Year rr_ExpenseExampleYear01 $ 76
3 Years rr_ExpenseExampleYear03 237
5 Years rr_ExpenseExampleYear05 413
10 Years rr_ExpenseExampleYear10 922
1 Year rr_ExpenseExampleNoRedemptionYear01 76
3 Years rr_ExpenseExampleNoRedemptionYear03 237
5 Years rr_ExpenseExampleNoRedemptionYear05 413
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 922
[1] Expenses have been restated to reflect current fees.