Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	COLUMBIA FUNDS SERIES TRUST I
Prospectus Date	rr_ProspectusDate	Jan. 01, 2018
Columbia Contrarian Core Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	SUMMARY OF THE FUND
Objective [Heading]	rr_ObjectiveHeading	Investment Objective
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	Columbia Contrarian Core Fund (the Fund) seeks total return, consisting of long-term capital appreciation and current income.
Expense [Heading]	rr_ExpenseHeading	Fees and Expenses of the Fund
Expense Narrative [Text Block]	rr_ExpenseNarrativeTextBlock	This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The front-end sales charge applicable to Class T shares is a per-transaction charge, meaning that separate orders will not be aggregated for purposes of calculating the rate of the sales charge payable. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information about these and other sales charge discounts and waivers is available from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 19 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.
Shareholder Fees Caption [Text]	rr_ShareholderFeesCaption	Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text]	rr_OperatingExpensesCaption	Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Portfolio Turnover [Heading]	rr_PortfolioTurnoverHeading	Portfolio Turnover
Portfolio Turnover [Text Block]	rr_PortfolioTurnoverTextBlock	The Fund may pay transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in annual fund operating expenses or in the example, affect the Fund’s performance. During the most recent fiscal year, the Fund’s portfolio turnover rate was 52% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	52.00%
Expense Breakpoint Discounts [Text]	rr_ExpenseBreakpointDiscounts	You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information about these and other sales charge discounts and waivers is available from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 19 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	$ 50,000
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Other expenses have been restated to reflect current transfer agency fees paid by the Fund.
Expense Example [Heading]	rr_ExpenseExampleHeading	Example
Expense Example Narrative [Text Block]	rr_ExpenseExampleNarrativeTextBlock	The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that: you invest $10,000 in the applicable class of Fund shares for the periods indicated, your investment has a 5% return each year, and the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:
Strategy [Heading]	rr_StrategyHeading	Principal Investment Strategies
Strategy Narrative [Text Block]	rr_StrategyNarrativeTextBlock	Under normal circumstances, the Fund invests at least 80% of its net assets (including the amount of any borrowings for investment purposes) in common stocks. In addition, under normal circumstances, the Fund invests at least 80% of its net assets in equity securities of U.S. companies that have large market capitalizations (generally over $2 billion) that the Fund’s investment manager believes are undervalued and have the potential for long-term growth and current income. The Fund may also invest up to 20% of its net assets in foreign securities. The Fund may invest directly in foreign securities or indirectly through depositary receipts. The Fund may from time to time emphasize one or more sectors in selecting its investments, including the financial services sector and the information technology and technology-related sectors.
Risk [Heading]	rr_RiskHeading	Principal Risks
Risk Narrative [Text Block]	rr_RiskNarrativeTextBlock	An investment in the Fund involves risks, including those described below. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Active Management Risk. Due to its active management, the Fund could underperform its benchmark index and/or other funds with similar investment objectives and/or strategies. Depositary Receipts Risk. Depositary receipts are receipts issued by a bank or trust company reflecting ownership of underlying securities issued by foreign companies. Some foreign securities are traded in the form of American Depositary Receipts and/or Global Depositary Receipts. Depositary receipts involve risks similar to the risks associated with investments in foreign securities, including those associated with investing in the particular country of an issuer, which may be related to the particular political, regulatory, economic, social and other conditions or events, including, for example, military confrontations, war and terrorism, occurring in the country and fluctuations in its currency, as well as market risk tied to the underlying foreign company. In addition, depositary receipt holders may have limited voting rights, may not have the same rights afforded typical company stockholders in the event of a corporate action such as an acquisition, merger or rights offering and may experience difficulty in receiving company stockholder communications. There is no guarantee that a financial institution will continue to sponsor depositary receipts, or that the depositary receipts will continue to trade on an exchange, either of which could adversely affect the liquidity, availability and pricing of the depositary receipt. Changes in foreign currency exchange rates will affect the value of depositary receipts and, therefore, may affect the value of the Fund's portfolio. Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities. The performance of the Fund may also be negatively affected by fluctuations in a foreign currency's strength or weakness relative to the U.S. dollar, particularly to the extent the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar. Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time. Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion. Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods. Sector Risk. At times, the Fund may have a significant portion of its assets invested in securities of companies conducting business in a related group of industries within a sector, including the financial services sector and the information technology and technology-related sectors. Companies in the same sector may be similarly affected by economic, regulatory, political or market events or conditions, which may make the Fund more vulnerable to unfavorable developments in that sector than funds that invest more broadly. Generally, the more broadly the Fund invests, the more it spreads risk and potentially reduces the risks of loss and volatility. Financial Services Sector. The Fund may be more susceptible to the particular risks that may affect companies in the financial services sector than if it were invested in a wider variety of companies in unrelated sectors. Companies in the financial services sector are subject to certain risks, including the risk of regulatory change, decreased liquidity in credit markets and unstable interest rates. Such companies may have concentrated portfolios, such as a high level of loans to real estate developers, which makes them vulnerable to economic conditions that affect that industry. Performance of such companies may be affected by competitive pressures and exposure to investments or agreements that, under certain circumstances, may lead to losses (e.g., subprime loans). Companies in the financial services sector are subject to extensive governmental regulation that may limit the amount and types of loans and other financial commitments they can make, and interest rates and fees that they may charge. In addition, profitability of such companies is largely dependent upon the availability and the cost of capital. Information Technology and Technology-Related Sectors. The Fund may be more susceptible to the particular risks that may affect companies in the information technology sector, as well as other technology-related sectors (collectively, the technology sectors) than if it were invested in a wider variety of companies in unrelated sectors. Companies in the technology sectors are subject to certain risks, including the risk that new services, equipment or technologies will not be accepted by consumers and businesses or will become rapidly obsolete. Performance of such companies may be affected by factors including obtaining and protecting patents (or the failure to do so) and significant competitive pressures, including aggressive pricing of their products or services, new market entrants, competition for market share and short product cycles due to an accelerated rate of technological developments. Such competitive pressures may lead to limited earnings and/or falling profit margins. As a result, the value of their securities may fall or fail to rise. In addition, many technology sector companies have limited operating histories and prices of these companies’ securities historically have been more volatile than other securities, especially over the short term. Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.
Risk Lose Money [Text]	rr_RiskLoseMoney	There is no assurance that the Fund will achieve its investment objective and you may lose money.
Risk Not Insured Depository Institution [Text]	rr_RiskNotInsuredDepositoryInstitution	An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading]	rr_BarChartAndPerformanceTableHeading	Performance Information
Performance Narrative [Text Block]	rr_PerformanceNarrativeTextBlock	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance. Prior to March 27, 2017, Class T shares were known as Class W shares and there was no sales charge on Class W shares. Beginning March 27, 2017, the maximum applicable sales charge attributable to Class T shares is 2.50% per transaction. The Fund’s Class T share returns (after applicable sales charges) have been adjusted to reflect the current maximum applicable sales charge of 2.50%. The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class Inst shares (adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities. The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes. The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedle.com/us.
Performance Information Illustrates Variability of Returns [Text]	rr_PerformanceInformationIllustratesVariabilityOfReturns	The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.
Performance Availability Phone [Text]	rr_PerformanceAvailabilityPhone	800.345.6611
Performance Availability Website Address [Text]	rr_PerformanceAvailabilityWebSiteAddress	columbiathreadneedle.com/us
Performance Past Does Not Indicate Future [Text]	rr_PerformancePastDoesNotIndicateFuture	The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.
Bar Chart [Heading]	rr_BarChartHeading	Year by Year Total Return (%) as of December 31 Each Year
Bar Chart Does Not Reflect Sales Loads [Text]	rr_BarChartDoesNotReflectSalesLoads	The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.
Bar Chart Closing [Text Block]	rr_BarChartClosingTextBlock	Best and Worst Quarterly Returns During the Period Shown in the Bar Chart Best                                                          2nd Quarter 2009                                                         20.67% Worst                                                       4th Quarter 2008                                                        -23.26%
Performance Table Heading	rr_PerformanceTableHeading	Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2016)
Performance Table Does Reflect Sales Loads	rr_PerformanceTableDoesReflectSalesLoads	The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a broad measure of market performance.
Performance Table Uses Highest Federal Rate	rr_PerformanceTableUsesHighestFederalRate	The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates and do not reflect the impact of state, local or foreign taxes.
Performance Table Not Relevant to Tax Deferred	rr_PerformanceTableNotRelevantToTaxDeferred	In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).
Performance Table One Class of after Tax Shown [Text]	rr_PerformanceTableOneClassOfAfterTaxShown	The after-tax returns are shown only for Class A shares and will vary for other share classes.
Columbia Contrarian Core Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.18%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.04%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.
1 year	rr_ExpenseExampleYear01	$ 675
3 years	rr_ExpenseExampleYear03	887
5 years	rr_ExpenseExampleYear05	1,116
10 years	rr_ExpenseExampleYear10	1,773
1 year	rr_ExpenseExampleNoRedemptionYear01	675
3 years	rr_ExpenseExampleNoRedemptionYear03	887
5 years	rr_ExpenseExampleNoRedemptionYear05	1,116
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,773
2007	rr_AnnualReturn2007	12.25%	[3]
2008	rr_AnnualReturn2008	(35.61%)	[3]
2009	rr_AnnualReturn2009	37.02%	[3]
2010	rr_AnnualReturn2010	15.91%	[3]
2011	rr_AnnualReturn2011	(1.19%)	[3]
2012	rr_AnnualReturn2012	18.33%	[3]
2013	rr_AnnualReturn2013	35.41%	[3]
2014	rr_AnnualReturn2014	12.66%	[3]
2015	rr_AnnualReturn2015	2.78%	[3]
2016	rr_AnnualReturn2016	8.35%	[3]
Year to Date Return, Label	rr_YearToDateReturnLabel	Year to Date return
Bar Chart, Year to Date Return, Date	rr_BarChartYearToDateReturnDate	Sep. 30, 2017
Bar Chart, Year to Date Return	rr_BarChartYearToDateReturn	15.30%
Highest Quarterly Return, Label	rr_HighestQuarterlyReturnLabel	Best
Highest Quarterly Return, Date	rr_BarChartHighestQuarterlyReturnDate	Jun. 30, 2009
Highest Quarterly Return	rr_BarChartHighestQuarterlyReturn	20.67%
Lowest Quarterly Return, Label	rr_LowestQuarterlyReturnLabel	Worst
Lowest Quarterly Return, Date	rr_BarChartLowestQuarterlyReturnDate	Dec. 31, 2008
Lowest Quarterly Return	rr_BarChartLowestQuarterlyReturn	(23.26%)
1 Year	rr_AverageAnnualReturnYear01	2.10%
5 Years	rr_AverageAnnualReturnYear05	13.63%
10 Years	rr_AverageAnnualReturnYear10	7.95%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 01, 1998
Columbia Contrarian Core Fund | Class Adv
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.18%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.79%
1 year	rr_ExpenseExampleYear01	$ 81
3 years	rr_ExpenseExampleYear03	252
5 years	rr_ExpenseExampleYear05	439
10 years	rr_ExpenseExampleYear10	978
1 year	rr_ExpenseExampleNoRedemptionYear01	81
3 years	rr_ExpenseExampleNoRedemptionYear03	252
5 years	rr_ExpenseExampleNoRedemptionYear05	439
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 978
1 Year	rr_AverageAnnualReturnYear01	8.60%
5 Years	rr_AverageAnnualReturnYear05	15.29%
10 Years	rr_AverageAnnualReturnYear10	8.87%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2012
Columbia Contrarian Core Fund | Class C
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[4]
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	1.00%
Other expenses	rr_OtherExpensesOverAssets	0.18%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.79%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.
1 year	rr_ExpenseExampleYear01	$ 282
3 years	rr_ExpenseExampleYear03	563
5 years	rr_ExpenseExampleYear05	970
10 years	rr_ExpenseExampleYear10	2,105
1 year	rr_ExpenseExampleNoRedemptionYear01	182
3 years	rr_ExpenseExampleNoRedemptionYear03	563
5 years	rr_ExpenseExampleNoRedemptionYear05	970
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 2,105
1 Year	rr_AverageAnnualReturnYear01	6.57%
5 Years	rr_AverageAnnualReturnYear05	14.14%
10 Years	rr_AverageAnnualReturnYear10	7.78%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 09, 2002
Columbia Contrarian Core Fund | Class Inst
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.18%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.79%
1 year	rr_ExpenseExampleYear01	$ 81
3 years	rr_ExpenseExampleYear03	252
5 years	rr_ExpenseExampleYear05	439
10 years	rr_ExpenseExampleYear10	978
1 year	rr_ExpenseExampleNoRedemptionYear01	81
3 years	rr_ExpenseExampleNoRedemptionYear03	252
5 years	rr_ExpenseExampleNoRedemptionYear05	439
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 978
1 Year	rr_AverageAnnualReturnYear01	8.64%
5 Years	rr_AverageAnnualReturnYear05	15.28%
10 Years	rr_AverageAnnualReturnYear10	8.86%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Dec. 14, 1992
Columbia Contrarian Core Fund | Class Inst2
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.08%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.69%
1 year	rr_ExpenseExampleYear01	$ 70
3 years	rr_ExpenseExampleYear03	221
5 years	rr_ExpenseExampleYear05	384
10 years	rr_ExpenseExampleYear10	859
1 year	rr_ExpenseExampleNoRedemptionYear01	70
3 years	rr_ExpenseExampleNoRedemptionYear03	221
5 years	rr_ExpenseExampleNoRedemptionYear05	384
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 859
1 Year	rr_AverageAnnualReturnYear01	8.77%
5 Years	rr_AverageAnnualReturnYear05	15.41%
10 Years	rr_AverageAnnualReturnYear10	8.93%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2012
Columbia Contrarian Core Fund | Class Inst3
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.03%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.64%
1 year	rr_ExpenseExampleYear01	$ 65
3 years	rr_ExpenseExampleYear03	205
5 years	rr_ExpenseExampleYear05	357
10 years	rr_ExpenseExampleYear10	798
1 year	rr_ExpenseExampleNoRedemptionYear01	65
3 years	rr_ExpenseExampleNoRedemptionYear03	205
5 years	rr_ExpenseExampleNoRedemptionYear05	357
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 798
1 Year	rr_AverageAnnualReturnYear01	8.77%
5 Years	rr_AverageAnnualReturnYear05	15.46%
10 Years	rr_AverageAnnualReturnYear10	8.95%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 08, 2012
Columbia Contrarian Core Fund | Class K
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.33%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	0.94%
1 year	rr_ExpenseExampleYear01	$ 96
3 years	rr_ExpenseExampleYear03	300
5 years	rr_ExpenseExampleYear05	520
10 years	rr_ExpenseExampleYear10	1,155
1 year	rr_ExpenseExampleNoRedemptionYear01	96
3 years	rr_ExpenseExampleNoRedemptionYear03	300
5 years	rr_ExpenseExampleNoRedemptionYear05	520
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,155
1 Year	rr_AverageAnnualReturnYear01	8.51%
5 Years	rr_AverageAnnualReturnYear05	15.15%
10 Years	rr_AverageAnnualReturnYear10	8.72%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Mar. 07, 2011
Columbia Contrarian Core Fund | Class R
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.50%
Other expenses	rr_OtherExpensesOverAssets	0.18%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.29%
1 year	rr_ExpenseExampleYear01	$ 131
3 years	rr_ExpenseExampleYear03	409
5 years	rr_ExpenseExampleYear05	708
10 years	rr_ExpenseExampleYear10	1,556
1 year	rr_ExpenseExampleNoRedemptionYear01	131
3 years	rr_ExpenseExampleNoRedemptionYear03	409
5 years	rr_ExpenseExampleNoRedemptionYear05	708
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,556
1 Year	rr_AverageAnnualReturnYear01	8.03%
5 Years	rr_AverageAnnualReturnYear05	14.70%
10 Years	rr_AverageAnnualReturnYear10	8.33%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Contrarian Core Fund | Class T
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	2.50%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	none
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other expenses	rr_OtherExpensesOverAssets	0.18%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.04%
1 year	rr_ExpenseExampleYear01	$ 353
3 years	rr_ExpenseExampleYear03	573
5 years	rr_ExpenseExampleYear05	810
10 years	rr_ExpenseExampleYear10	1,489
1 year	rr_ExpenseExampleNoRedemptionYear01	353
3 years	rr_ExpenseExampleNoRedemptionYear03	573
5 years	rr_ExpenseExampleNoRedemptionYear05	810
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,489
1 Year	rr_AverageAnnualReturnYear01	5.57%
5 Years	rr_AverageAnnualReturnYear05	14.41%
10 Years	rr_AverageAnnualReturnYear10	8.32%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Sep. 27, 2010
Columbia Contrarian Core Fund | Class V
Risk/Return:	rr_RiskReturnAbstract
Maximum sales charge (load) imposed on purchases (as a % of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	5.75%
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Management fees	rr_ManagementFeesOverAssets	0.61%
Distribution and/or service (12b-1) fees	rr_DistributionAndService12b1FeesOverAssets	none
Other expenses	rr_OtherExpensesOverAssets	0.43%	[2]
Total annual Fund operating expenses	rr_ExpensesOverAssets	1.04%
Expenses Deferred Charges [Text Block]	rr_ExpensesDeferredChargesTextBlock	This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.
1 year	rr_ExpenseExampleYear01	$ 675
3 years	rr_ExpenseExampleYear03	887
5 years	rr_ExpenseExampleYear05	1,116
10 years	rr_ExpenseExampleYear10	1,773
1 year	rr_ExpenseExampleNoRedemptionYear01	675
3 years	rr_ExpenseExampleNoRedemptionYear03	887
5 years	rr_ExpenseExampleNoRedemptionYear05	1,116
10 years	rr_ExpenseExampleNoRedemptionYear10	$ 1,773
1 Year	rr_AverageAnnualReturnYear01	2.11%
5 Years	rr_AverageAnnualReturnYear05	13.60%
10 Years	rr_AverageAnnualReturnYear10	7.90%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Feb. 12, 1993
Columbia Contrarian Core Fund | returns after taxes on distributions | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.76%
5 Years	rr_AverageAnnualReturnYear05	12.51%
10 Years	rr_AverageAnnualReturnYear10	7.20%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 01, 1998
Columbia Contrarian Core Fund | returns after taxes on distributions and sale of Fund shares | Class A
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	1.48%
5 Years	rr_AverageAnnualReturnYear05	10.80%
10 Years	rr_AverageAnnualReturnYear10	6.39%
Share Class Inception Date	rr_AverageAnnualReturnInceptionDate	Nov. 01, 1998
Columbia Contrarian Core Fund | Russell 1000 Index (reflects no deductions for fees, expenses or taxes)
Risk/Return:	rr_RiskReturnAbstract
1 Year	rr_AverageAnnualReturnYear01	12.05%
5 Years	rr_AverageAnnualReturnYear05	14.69%
10 Years	rr_AverageAnnualReturnYear10	7.08%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[3] Year to Date return as of September 30, 2017: 15.30%

[4] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.