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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Document Type dei_DocumentType Other
Document Period End Date dei_DocumentPeriodEndDate Aug. 31, 2012
Registrant Name dei_EntityRegistrantName OPPENHEIMER CAPITAL APPRECIATION FUND
Central Index Key dei_EntityCentralIndexKey 0000319767
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Jun. 26, 2013
Document Effective Date dei_DocumentEffectiveDate Jun. 26, 2013
Prospectus Date rr_ProspectusDate Dec. 28, 2012
Supplement [Text Block] oppenheimer_SupplementTextBlock
OPPENHEIMER CAPITAL APPRECIATION FUND
Supplement dated June 26, 2013 to the Prospectus and
Statement of Additional Information, each dated December 28, 2012

This supplement amends the Prospectus and Statement of Additional Information ("SAI") of Oppenheimer Capital Appreciation Fund (the "Fund"), each dated December 28, 2012, and is in addition to any other supplements.

Effective July 1, 2013:
(Oppenheimer Capital Appreciation Fund)
  
Risk/Return: rr_RiskReturnAbstract  
Annual Fund Operating Expenses Supplement [Text Block] oppenheimer_SupplementTextBlock01

The table titled "Annual Fund Operating Expenses" and the footnotes that immediately follow it, on page 3 of the Prospectus, have been deleted in their entirety and replaced with the following:
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)

[1]
Expense Example Supplement [Text Block] oppenheimer_SupplementTextBlock02

The table under the section titled "Example," on page 3 of the Prospectus, has been deleted in its entirety and replaced with the following:
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 Capital Appreciation Fund) | Class A
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.23%
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.05%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 676
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 891
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,124
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,790
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 676
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 891
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 1,124
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,790
(Oppenheimer Capital Appreciation Fund) | Class B
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.99%
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.81%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 686
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 875
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 1,189
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,757
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 186
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 575
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 989
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,757
(Oppenheimer Capital Appreciation Fund) | Class C
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 287
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 578
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 994
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 2,156
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 187
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 578
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 994
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 2,156
(Oppenheimer Capital Appreciation Fund) | Class N
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.49%
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.31%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 234
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 418
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 723
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,589
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 134
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 418
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 723
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,589
(Oppenheimer Capital Appreciation Fund) | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.23%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.82%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 84
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 263
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 457
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 1,018
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 84
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 263
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 457
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 1,018
(Oppenheimer Capital Appreciation Fund) | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Management Fees rr_ManagementFeesOverAssets 0.59%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.04%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 65
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 202
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 352
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 789
Expense Example, No Redemption, 1 Year rr_ExpenseExampleNoRedemptionYear01 65
Expense Example, No Redemption, 3 Years rr_ExpenseExampleNoRedemptionYear03 202
Expense Example, No Redemption, 5 Years rr_ExpenseExampleNoRedemptionYear05 352
Expense Example, No Redemption, 10 Years rr_ExpenseExampleNoRedemptionYear10 789
[1] Expenses have been restated to reflect current fees.