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BMO Dividend Income Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Dividend Income Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
To provide 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, hold, and sell shares of the Fund. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the table and example below. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of certain BMO Funds. More information about these and other discounts and waivers is available from your financial professional and under “How to Buy Shares – Purchase of Class A Shares – Class A Shares – Sales Charge” on page 60 of this Prospectus, under “How to Buy Shares – Class A Shares – Waivers and Reductions of Sales Charges” beginning on page 61 of this Prospectus, under “Appendix–Sales Charge Waivers” on page 90 of this Prospectus, and “How to Buy Shares” beginning on page B-36 of the Fund’s Statement of Additional Information.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination December 31, 2022
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Fund incurs 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 32% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 32.00%
Expenses Deferred Charges [Text Block] rr_ExpensesDeferredChargesTextBlock The Maximum Deferred Sales Charge on Class A shares is applied only to purchases of $1,000,000 or more that are redeemed within 18 months of purchase.
Expense Breakpoint Discounts [Text] rr_ExpenseBreakpointDiscounts You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $50,000 in Class A shares of certain BMO Funds.
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 50,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This 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 assumes that you invest $10,000 in the Fund for the time periods indicated, whether you redeem all of your shares at the end of those periods or not. The example also assumes that your investment has a 5% return each year and that the Fund’s operating expenses are as shown in the table and remain the same. The costs in the one-year example and for the first year of the three-, five-, and ten-year examples reflect Columbia’s agreement to waive fees and reimburse expenses through December 31, 2022. Although your actual costs and returns may be higher or lower, based on these assumptions your costs would be:
Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock
The Fund invests at least 80% of its net assets primarily in dividend paying common stocks of large-sized U.S. companies similar in size, at the time of purchase, to those within the Russell 1000® Value Index. The largest company by market capitalization in the Russell 1000® Value Index was approximately $1.97 trillion as of October 31, 2021 and the median market capitalization of companies in the Index as of the same period was $13.9 billion. The Fund may at times focus its investments in one or more sectors.
To provide both capital appreciation and current income, Columbia selects stocks using a unique, value-oriented approach, focusing on companies with dividend yields in excess of 1%, which combines the use of proprietary analytical 
tools and the qualitative judgments of the investment team. In general, Columbia believes companies that are undervalued relative to their fundamentals and exhibit improving investor interest outperform the market over full market cycles. As a result, Columbia’s investment process begins by using tools to rank stocks based on expected returns, construct preliminary portfolios with the use of fundamental factors, and manage risk. Columbia also integrates environmental, social, and governance (ESG) considerations into its investment process. All purchases and sales of portfolio securities, however, are subjected ultimately to the investment team’s qualitative judgments developed from their cumulative investment experience. The entire process is designed to focus on company fundamentals through both quantitative and qualitative analysis to balance return generation with risk management. 
From time to time, the Fund maintains a portion of its assets in cash. The Fund may increase its cash holdings in response to market conditions or in the event attractive investment opportunities are not available. 
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock
The Fund cannot assure that it will achieve its investment objective. An investment in the Fund is not a deposit of BMO Harris Bank N.A., or any of its affiliates, and is not insured or guaranteed by the FDIC or any other government agency. The net asset value of the Fund will vary and you could lose money by investing in the Fund. In addition, the Fund is subject to the following risks.
Common Stock Risks. Common stocks are susceptible to general stock market fluctuations and to volatile increases and decreases in value as market confidence in, and perceptions of, their issuers change. Holders of common stocks are generally subject to greater risk than holders of preferred stocks and debt obligations of the same issuer because common stockholders generally have inferior rights to receive payments from issuers in comparison with the rights of preferred stockholders, bondholders, and other creditors.
Income Risks. The Fund can distribute to shareholders only what it earns. Therefore, if the amount of interest and/or dividends the Fund receives from its investments declines, the amount of dividends shareholders receive from the Fund also will decline. In addition, depending upon market conditions, an income producing common stock that meets the Fund’s investment criteria may not be widely available and/or may be highly concentrated in only a few market sectors. This may limit the ability of the Fund to produce current income.
Style Risks. Investments in value stocks are subject to the risk that their intrinsic values may never be realized by the market, that a stock judged to be undervalued may actually be 
appropriately priced, or that their prices may decline, even though in theory they are already undervalued. Value stocks can react differently to issuer, political, market, and economic developments than the market as a whole and other types of stocks (e.g., growth stocks). 
Sector Risks. Companies with similar characteristics, such as those within similar industries, may be grouped together in broad categories called sectors. To the extent the Fund invests its assets in a particular sector, the Fund’s performance may be more susceptible to any economic, business, or other developments that generally affect that sector. 
Stock Market Risks. The Fund is subject to fluctuations in the stock market, which has periods of increasing and decreasing value. Stocks are generally more volatile than debt securities. The value of equity securities purchased by the Fund may decline if the financial condition of the companies in which the Fund invests declines or if overall market and economic conditions deteriorate. If the value of the Fund’s investments goes down, you may lose money. U.S. and international markets have experienced significant periods of volatility in recent months and years, due to a number of economic, political and global macro factors, including the impact of the coronavirus (COVID-19) global pandemic, which resulted in a public health crisis, business interruptions, growth concerns in the U.S. and overseas, travel restrictions, changed social behaviors, rising inflation and reduced consumer spending. While U.S. and global economies have recovered in some respects from the effects of COVID-19, the recovery is proceeding at slower than expected rates and may last for a prolonged period of time. Policy changes by the U.S. government and/or Federal Reserve, such as raising interest rates, also could cause increased volatility in financial markets, which could have a negative impact on the Fund. Adverse market events also may lead to increased shareholder redemptions, which could cause the Fund to experience a loss or difficulty in selling investments to meet such redemptions. 
Management Risks. Columbia's judgments about the attractiveness, value, and potential appreciation of the Fund’s investments may prove to be incorrect. Accordingly, no guarantee exists that the investment techniques used by the Fund’s portfolio managers will produce the desired results. 
Risk Lose Money [Text] rr_RiskLoseMoney The net asset value of the Fund will vary and you could lose money by investing in the Fund.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit of BMO Harris Bank N.A., or any of its affiliates, and is not insured or guaranteed by the FDIC or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Fund Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and table show the historical performance of the Fund’s shares and provide some indication of the risks of investing in the Fund. The bar chart shows how the Fund’s total returns before taxes have varied from year to year, while the table compares the Fund’s average annual total returns to the returns of broad measures of market performance and an index of funds with similar investment objectives. Prior to 
December 16, 2021, the Fund was managed by the Adviser. Please keep in mind that past performance, before and after taxes, does not represent how the Fund will perform in the future. Investors may obtain updated performance information for the Fund at bmofunds.com. 
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and table show the historical performance of the Fund’s shares and provide some indication of the risks of investing in the Fund. The bar chart shows how the Fund’s total returns before taxes have varied from year to year, while the table compares the Fund’s average annual total returns to the returns of broad measures of market performance and an index of funds with similar investment objectives.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell 1000® Value Index (Russell 1000® Value) measures the performance of those companies included in the Russell 1000® Index with lower price-to-book ratios and lower forecasted growth values.The S&P 500® Index (S&P 500®) is a market capitalization-weighted index of 500 common stocks chosen for market size, liquidity, and industry group representation to represent U.S. equity performance.The Lipper Equity Income Funds Index (LEII) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress bmofunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please keep in mind that past performance, before and after taxes, does not represent how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Class I—Annual Total Returns (calendar years 2012-2020) 
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The return for the Class I shares of the Fund from January 1, 2021 through September 30, 2021 was 18.75%. 
During the periods shown in the bar chart for the Fund: 
  Quarter Ended Returns
Best quarter 6/30/2020 17.15%
Worst quarter 3/31/2020 (29.56)%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns through 12/31/20
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual marginal federal income tax rates and do not reflectthe effect of any applicable state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns shown are not relevant to investors holding shares through tax-deferred programs, such as IRAs or 401(k) plans.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown After-tax returns are shown only for Class I and after-tax returns for Class A will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher The Return After Taxes on Distributions and Sale of Fund Shares may be higher than other return figures when a capital loss is realized on the sale of Fund shares which provides an assumed tax benefit to the shareholder that increases the after-tax return.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After-tax returns are calculated using the highest historical individual marginal federal income tax rates and do not reflect
the effect of any applicable state and local taxes. Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors holding shares through tax-deferred programs, such as IRAs or 401(k) plans. After-tax returns are shown only for Class I and after-tax returns for Class A will vary.
The Return After Taxes on Distributions and Sale of Fund Shares may be higher than other return figures when a capital loss is realized on the sale of Fund shares which provides an assumed tax benefit to the shareholder that increases the after-tax return.
The Russell 1000® Value Index (Russell 1000® Value) measures the performance of those companies included in the Russell 1000® Index with lower price-to-book ratios and lower forecasted growth values.
The S&P 500® Index (S&P 500®) is a market capitalization-weighted index of 500 common stocks chosen for market size, liquidity, and industry group representation to represent U.S. equity performance.
The Lipper Equity Income Funds Index (LEII) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.
BMO Dividend Income Fund | Class I  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase) rr_MaximumDeferredSalesChargeOverOther none [1]
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.77%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.65% [2]
1 Year rr_ExpenseExampleYear01 $ 66
3 Years rr_ExpenseExampleYear03 234
5 Years rr_ExpenseExampleYear05 416
10 Years rr_ExpenseExampleYear10 943
1 Year rr_ExpenseExampleNoRedemptionYear01 66
3 Years rr_ExpenseExampleNoRedemptionYear03 234
5 Years rr_ExpenseExampleNoRedemptionYear05 416
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 943
2012 rr_AnnualReturn2012 11.88%
2013 rr_AnnualReturn2013 28.76%
2014 rr_AnnualReturn2014 13.85%
2015 rr_AnnualReturn2015 (3.51%)
2016 rr_AnnualReturn2016 15.44%
2017 rr_AnnualReturn2017 21.90%
2018 rr_AnnualReturn2018 (4.35%)
2019 rr_AnnualReturn2019 23.60%
2020 rr_AnnualReturn2020 1.14%
Year to Date Return, Label rr_YearToDateReturnLabel The return for the Class I shares of the Fund from January 1, 2021 through September 30, 2021
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2021
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 18.75%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 17.15%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.56%)
1 Year rr_AverageAnnualReturnYear01 1.14%
5 Years rr_AverageAnnualReturnYear05 10.97%
Since Inception rr_AverageAnnualReturnSinceInception 11.44%
Inception Date rr_AverageAnnualReturnInceptionDate Dec. 29, 2011
BMO Dividend Income Fund | Class A  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice 5.00%
Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase) rr_MaximumDeferredSalesChargeOverOther 1.00% [1]
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.50%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 0.27%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.02%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.90% [2]
1 Year rr_ExpenseExampleYear01 $ 587
3 Years rr_ExpenseExampleYear03 797
5 Years rr_ExpenseExampleYear05 1,024
10 Years rr_ExpenseExampleYear10 1,675
1 Year rr_ExpenseExampleNoRedemptionYear01 587
3 Years rr_ExpenseExampleNoRedemptionYear03 797
5 Years rr_ExpenseExampleNoRedemptionYear05 1,024
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,675
1 Year rr_AverageAnnualReturnYear01 0.91%
5 Years rr_AverageAnnualReturnYear05 10.69%
Since Inception rr_AverageAnnualReturnSinceInception 8.81%
Inception Date rr_AverageAnnualReturnInceptionDate May 27, 2014
BMO Dividend Income Fund | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.42%
5 Years rr_AverageAnnualReturnYear05 9.34%
Since Inception rr_AverageAnnualReturnSinceInception 9.79%
BMO Dividend Income Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.89%
5 Years rr_AverageAnnualReturnYear05 8.32%
Since Inception rr_AverageAnnualReturnSinceInception 8.97%
BMO Dividend Income Fund | Russell 1000® Value (reflects no deduction for fees, expenses or taxes) | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.80%
5 Years rr_AverageAnnualReturnYear05 9.74%
Since Inception rr_AverageAnnualReturnSinceInception 11.62%
BMO Dividend Income Fund | Russell 1000® Value (reflects no deduction for fees, expenses or taxes) | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.80%
5 Years rr_AverageAnnualReturnYear05 9.74%
Since Inception rr_AverageAnnualReturnSinceInception 7.94%
BMO Dividend Income Fund | S&P 500® (reflects no deduction for fees, expenses or taxes) | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.21%
Since Inception rr_AverageAnnualReturnSinceInception 15.22%
BMO Dividend Income Fund | S&P 500® (reflects no deduction for fees, expenses or taxes) | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.40%
5 Years rr_AverageAnnualReturnYear05 15.21%
Since Inception rr_AverageAnnualReturnSinceInception 13.03%
BMO Dividend Income Fund | LEII (reflects deduction of fees and no deduction for sales charges or taxes) | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.72%
5 Years rr_AverageAnnualReturnYear05 10.46%
Since Inception rr_AverageAnnualReturnSinceInception 11.07%
BMO Dividend Income Fund | LEII (reflects deduction of fees and no deduction for sales charges or taxes) | Class A  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 4.72%
5 Years rr_AverageAnnualReturnYear05 10.46%
Since Inception rr_AverageAnnualReturnSinceInception 8.33%
[1] The Maximum Deferred Sales Charge on Class A shares is applied only to purchases of $1,000,000 or more that are redeemed within 18 months of purchase.
[2] BMO Asset Management Corp. (Adviser) agreed to waive or reduce its investment advisory fee and reimburse expenses to the extent necessary to prevent total annual operating expenses (excluding interest, taxes, brokerage commissions, other investment-related costs, and extraordinary expenses, such as litigation and other expenses not incurred in the ordinary course of the Fund’s business, and Acquired Fund Fees and Expenses) from exceeding 0.65% for Class I and 0.90% for Class A through December 31, 2022. Effective December 16, 2021, the Adviser’s role as investment adviser to the Fund terminated. Columbia Management Investment Advisers, LLC (Columbia), the new investment adviser to the Fund, has agreed to maintain the fee waiver in place through December 31, 2022. This expense limitation agreement may not be terminated prior to December 31, 2022 without the consent of the Fund’s Board of Directors, unless terminated due to the termination of the investment advisory agreement.