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BMO Mid-Cap Growth Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Mid-Cap Growth Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
To provide capital appreciation.
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 114% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 114.00%
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 assets in growth-oriented common stocks of medium-sized U.S. companies similar in size, at the time of purchase, to those within the Russell Midcap® Growth Index. The largest company by market capitalization in the Russell Midcap® Growth Index was approximately $65.8 billion as of October 31, 2021 and the median market capitalization of companies in the Index as of the same period was $13.6 billion. The Fund may at times focus its investments in one or more sectors. 
Columbia selects stocks using a unique, growth-oriented approach focusing on high quality companies with sustainable earnings growth that are available at reasonable prices, 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.
Company Size Risks. Generally, the smaller the market capitalization of a company, the fewer the number of shares traded daily, the less liquid its stock and the more volatile its price. Companies with smaller market capitalizations also tend to have unproven track records, a limited product or service base, and limited access to capital. These factors also increase risks and make these companies more likely to fail than companies with larger market capitalizations. 
Style Risks. Due to their relatively high valuations, growth stocks are typically more volatile than value stocks. Further, growth stocks may not pay dividends or may pay lower dividends than value stocks. This means they depend more on price changes for returns and may be more adversely affected in a down market compared to value stocks that pay higher dividends. 
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. 
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. 
Information Technology Sector Risks. The information technology sector can be significantly affected by rapid obsolescence of existing technology, short product cycles, falling prices and profits, competition from new market entrants, government regulation, and general economic conditions. 
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 a broad measure 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 a broad measure of market performance and an index of funds with similar investment objectives.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Russell Midcap® Growth Index (RMCGI) measures the performance of those companies included in the Russell Midcap® Index with higher price-to-book ratios and higher forecasted growth values. Those companies also are included in the Russell 1000® Growth Index.The Lipper Mid-Cap Growth Funds Index (LMCGI) 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 2011-2020)
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 14.14%. 
During the periods shown in the bar chart for the Fund: 
  Quarter Ended Returns
Best quarter 6/30/2020 33.36%
Worst quarter 3/31/2020 (24.50)%
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 reflect the 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 and Class R6 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 and Class R6 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 Midcap® Growth Index (RMCGI) measures the performance of those companies included in the Russell Midcap® Index with higher price-to-book ratios and higher forecasted growth values. Those companies also are included in the Russell 1000® Growth Index.
The Lipper Mid-Cap Growth Funds Index (LMCGI) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.
BMO Mid-Cap Growth 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 0.69%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.96%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.65%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.66%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.99% [2]
1 Year rr_ExpenseExampleYear01 $ 101
3 Years rr_ExpenseExampleYear03 555
5 Years rr_ExpenseExampleYear05 1,035
10 Years rr_ExpenseExampleYear10 2,362
1 Year rr_ExpenseExampleNoRedemptionYear01 101
3 Years rr_ExpenseExampleNoRedemptionYear03 555
5 Years rr_ExpenseExampleNoRedemptionYear05 1,035
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,362
2011 rr_AnnualReturn2011 (2.79%)
2012 rr_AnnualReturn2012 17.23%
2013 rr_AnnualReturn2013 29.11%
2014 rr_AnnualReturn2014 5.49%
2015 rr_AnnualReturn2015 (8.62%)
2016 rr_AnnualReturn2016 4.81%
2017 rr_AnnualReturn2017 27.30%
2018 rr_AnnualReturn2018 (3.69%)
2019 rr_AnnualReturn2019 28.36%
2020 rr_AnnualReturn2020 28.17%
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 14.14%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2020
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 33.36%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2020
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (24.50%)
1 Year rr_AverageAnnualReturnYear01 28.17%
5 Years rr_AverageAnnualReturnYear05 16.15%
10 Years rr_AverageAnnualReturnYear10 11.61%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 31, 2008
BMO Mid-Cap Growth 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 0.69%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses rr_OtherExpensesOverAssets 1.17%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 2.11%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.87%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.24% [2]
1 Year rr_ExpenseExampleYear01 $ 620
3 Years rr_ExpenseExampleYear03 1,100
5 Years rr_ExpenseExampleYear05 1,605
10 Years rr_ExpenseExampleYear10 2,989
1 Year rr_ExpenseExampleNoRedemptionYear01 620
3 Years rr_ExpenseExampleNoRedemptionYear03 1,100
5 Years rr_ExpenseExampleNoRedemptionYear05 1,605
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 2,989
1 Year rr_AverageAnnualReturnYear01 27.86%
5 Years rr_AverageAnnualReturnYear05 15.85%
Since Inception rr_AverageAnnualReturnSinceInception 10.93%
Inception Date rr_AverageAnnualReturnInceptionDate May 27, 2014
BMO Mid-Cap Growth Fund | Class R6  
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 0.69%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 1.28%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.97%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (1.13%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.84% [2]
1 Year rr_ExpenseExampleYear01 $ 86
3 Years rr_ExpenseExampleYear03 290
5 Years rr_ExpenseExampleYear05 510
10 Years rr_ExpenseExampleYear10 1,146
1 Year rr_ExpenseExampleNoRedemptionYear01 86
3 Years rr_ExpenseExampleNoRedemptionYear03 290
5 Years rr_ExpenseExampleNoRedemptionYear05 510
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 1,146
1 Year rr_AverageAnnualReturnYear01 27.54%
5 Years rr_AverageAnnualReturnYear05 16.17%
Since Inception rr_AverageAnnualReturnSinceInception 11.28%
Inception Date rr_AverageAnnualReturnInceptionDate May 27, 2014
BMO Mid-Cap Growth Fund | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 14.41%
5 Years rr_AverageAnnualReturnYear05 9.94%
10 Years rr_AverageAnnualReturnYear10 7.32%
BMO Mid-Cap Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 23.88%
5 Years rr_AverageAnnualReturnYear05 11.25%
10 Years rr_AverageAnnualReturnYear10 8.21%
BMO Mid-Cap Growth Fund | RMCGI (reflects no deduction for fees, expenses or taxes) | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 35.59%
5 Years rr_AverageAnnualReturnYear05 18.66%
10 Years rr_AverageAnnualReturnYear10 15.05%
BMO Mid-Cap Growth Fund | RMCGI (reflects no deduction for fees, expenses or taxes) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 35.59%
5 Years rr_AverageAnnualReturnYear05 18.66%
Since Inception rr_AverageAnnualReturnSinceInception 15.26%
BMO Mid-Cap Growth Fund | LMCGI (reflects deduction of fees and no deduction for sales charges or taxes) | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 35.98%
5 Years rr_AverageAnnualReturnYear05 18.60%
10 Years rr_AverageAnnualReturnYear10 13.90%
BMO Mid-Cap Growth Fund | LMCGI (reflects deduction of fees and no deduction for sales charges or taxes) | Class R6  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 35.98%
5 Years rr_AverageAnnualReturnYear05 18.60%
Since Inception rr_AverageAnnualReturnSinceInception 14.88%
[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 class 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 0.99% for Class I, 1.24% for Class A, and 0.84% for Class R6 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.