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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BMO FUNDS, INC.
Prospectus Date rr_ProspectusDate Dec. 27, 2013
BMO Large-Cap Growth Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Large-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 and hold shares of the Fund.
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, 2014
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 100% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 100.00%
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 funds. The example assumes that you invest $10,000 in the Fund for the time periods indicated and then redeem all of your shares at the end of those periods. 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 the Adviser’s agreement to waive fees and reimburse expenses through December 31, 2014. 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 common stocks of large-sized U.S. companies similar in size, at the time of purchase, to those within the Russell 1000® Growth Index. The largest company by market capitalization in the Russell 1000® Growth Index was approximately $490.3 billion as of October 31, 2013 and the median market capitalization of companies in the Index as of the same period was $7.9 billion.

The Adviser selects stocks using a unique, quantitative, growth-oriented approach and looks for high quality companies with sustainable earnings growth that are available at reasonable prices.

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.

Stock Market Risks. The Fund is subject to fluctuations in the stock market, which has periods of increasing and decreasing values. Stocks are more volatile than debt securities. If the value of the Fund’s investments goes down, you may lose money.

Sector Risks. Companies with similar characteristics, such as those within the same industry, 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.

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.

Management Risks. The Adviser’s judgments about the attractiveness, value, and potential appreciation of the Fund’s investments may prove to be incorrect. Accordingly, no guarantee that the investment techniques used by the Fund’s managers will produce the desired results.

Portfolio Turnover Risks. A high portfolio rate (100% or more) may result in the realization and distribution to shareholders of a greater amount of capital gains than if the Fund had a low portfolio turnover rate. Therefore, you may have higher tax liability. High portfolio turnover also may result in higher transaction costs, which may negatively affect Fund performance.

Information Risks. When the quantitative models (“Models”) and information and data (“Data”) used in managing the Fund prove to be incorrect or incomplete, any investment decisions made in reliance on the Models and Data may not produce the desired results and the Fund may realize losses. The success of Models that are predictive in nature is dependent largely upon the accuracy and reliability of the supplied historical data. All Models are susceptible to input errors that may cause the resulting information to be incorrect.

Quantitative Model Investment Risks. The success of a quantitative investment model depends on the analyses and assessments that were used in developing such model. Incorrect analyses and assessments or inaccurate or incomplete data would adversely affect performance. There can be no assurance that the model will enable to the Fund to achieve its investment objective.
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. 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 www.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 Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.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 Y—Annual Total Returns (calendar years 2003-2012)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

The return for the Class Y shares of the Fund from January 1, 2013 through September 30, 2013 was 18.52%.

 

During the periods shown in the bar chart for the Fund:

 

    Quarter Ended      Returns  
Best quarter     9/30/2009         15.99 % 
Worst quarter     12/31/2008         (22.17 )% 
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns through 12/31/12
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 Y, and after-tax returns for Class I will vary.
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher Return After Taxes on Distributions and Sale of Fund Shares may be higher than Return Before Taxes when a net capital loss occurs upon the redemption of Fund shares.
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. Return After Taxes on Distributions and Sale of Fund Shares may be higher than Return Before Taxes when a net capital loss occurs upon the redemption of Fund shares. After-tax returns are shown only for Class Y, and after-tax returns for Class I will vary.

The Russell 1000® Growth Index (Russell 1000® Growth) measures the performance of those companies included in the Russell 1000® Index with higher price-to-book ratios and higher forecasted growth values.

The Lipper Multi-Cap Growth Funds Index (LMLCGFI) is an average of the 30 largest mutual funds included in this Lipper category.
BMO Large-Cap Growth Fund | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.50%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.25%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 1.24% [1]
1 Year rr_ExpenseExampleYear01 $ 126
3 Years rr_ExpenseExampleYear03 396
5 Years rr_ExpenseExampleYear05 685
10 Years rr_ExpenseExampleYear10 1,510
2003 rr_AnnualReturn2003 24.72%
2004 rr_AnnualReturn2004 8.96%
2005 rr_AnnualReturn2005 4.91%
2006 rr_AnnualReturn2006 8.97%
2007 rr_AnnualReturn2007 13.57%
2008 rr_AnnualReturn2008 (39.39%)
2009 rr_AnnualReturn2009 34.39%
2010 rr_AnnualReturn2010 14.44%
2011 rr_AnnualReturn2011 (1.37%)
2012 rr_AnnualReturn2012 17.67%
Year to Date Return, Label rr_YearToDateReturnLabel The return for the Class Y shares of the Fund from January 1, 2013 through September 30, 2013
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 18.52%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 15.99%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.17%)
1 Year rr_AverageAnnualReturnYear01 17.67%
5 Year rr_AverageAnnualReturnYear05 1.59%
10 Year rr_AverageAnnualReturnYear10 6.68%
BMO Large-Cap Growth Fund | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.25%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.00%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.01%) [1]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.99% [1]
1 Year rr_ExpenseExampleYear01 101
3 Years rr_ExpenseExampleYear03 317
5 Years rr_ExpenseExampleYear05 551
10 Years rr_ExpenseExampleYear10 $ 1,224
1 Year rr_AverageAnnualReturnYear01 17.90%
5 Year rr_AverageAnnualReturnYear05   
Since Inception rr_AverageAnnualReturnSinceInception 4.19%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 31, 2008
BMO Large-Cap Growth Fund | Return After Taxes on Distributions | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 16.35%
5 Year rr_AverageAnnualReturnYear05 1.34%
10 Year rr_AverageAnnualReturnYear10 6.07%
BMO Large-Cap Growth Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.22%
5 Year rr_AverageAnnualReturnYear05 1.35%
10 Year rr_AverageAnnualReturnYear10 5.74%
BMO Large-Cap Growth Fund | Russell 1000® Growth (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.26%
5 Year rr_AverageAnnualReturnYear05 3.12%
10 Year rr_AverageAnnualReturnYear10 7.52%
BMO Large-Cap Growth Fund | LMLCGFI (reflects deduction of fees and no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 15.88%
5 Year rr_AverageAnnualReturnYear05 1.41%
10 Year rr_AverageAnnualReturnYear10 8.06%
[1] BMO Asset Management Corp. (Adviser) has 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 1.24% for Class Y and 0.99% for Class I through December 31, 2014. This expense limitation agreement may not be terminated prior to December 31, 2014 without the consent of the Fund's Board of Directors, unless terminated due to the termination of the investment advisory agreement.