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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BMO FUNDS, INC.
Prospectus Date rr_ProspectusDate Dec. 27, 2013
BMO Mid-Cap Value Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Mid-Cap Value 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 48% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 48.00%
Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text] rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees Total Annual Fund Operating Expenses shown will not correlate to the Fund’s ratios of expenses to average net assets appearing in the Financial Highlights tables, which do not include Acquired Fund Fees and Expenses.
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. 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 value-oriented common stocks of medium-sized U.S. companies similar in size, at the time of purchase, to those within the Russell Midcap® Value Index. The largest company by market capitalization in the Russell Midcap® Value Index was approximately $28.0 billion as of October 31, 2013 and the median market capitalization of companies in the Index as of the same period was $5.1 billion.

The Adviser selects companies that exhibit traditional value characteristics, such as a price-to-earnings ratio less than the S&P 400® Index, higher-than-average dividend yields, or a lower-than-average price-to-book value. In addition, these companies may have under-appreciated assets, or be involved in company turnarounds or corporate restructurings.
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. 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).

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.

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 exists that the investment techniques used by the Fund’s 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. 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 26.67%.

 

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

 

    Quarter Ended      Returns  
Best quarter     9/30/2009         21.90 % 
Worst quarter     12/31/2008         (22.55 )% 
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 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 Y, and after-tax returns for Class I will vary.

The Russell Midcap® Value Index (RMCVI) measures the performance of those companies included in the Russell Midcap® Index with lower price-to-book ratios and lower forecasted growth values. Those companies are also included in the Russell 1000® Value Index.

The Lipper Mid-Cap Value Funds Index (LMCVFI) is an average of the 30 largest mutual funds included in this Lipper category.
BMO Mid-Cap Value 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 0.47%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.23% [2]
1 Year rr_ExpenseExampleYear01 $ 125
3 Years rr_ExpenseExampleYear03 390
5 Years rr_ExpenseExampleYear05 676
10 Years rr_ExpenseExampleYear10 1,489
2003 rr_AnnualReturn2003 35.87%
2004 rr_AnnualReturn2004 16.67%
2005 rr_AnnualReturn2005 7.18%
2006 rr_AnnualReturn2006 13.88%
2007 rr_AnnualReturn2007 0.75%
2008 rr_AnnualReturn2008 (37.17%)
2009 rr_AnnualReturn2009 36.63%
2010 rr_AnnualReturn2010 21.67%
2011 rr_AnnualReturn2011 (6.82%)
2012 rr_AnnualReturn2012 19.09%
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 26.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.90%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2008
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (22.55%)
1 Year rr_AverageAnnualReturnYear01 19.09%
5 Year rr_AverageAnnualReturnYear05 3.00%
10 Year rr_AverageAnnualReturnYear10 8.49%
BMO Mid-Cap Value 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 0.22%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.98% [2]
1 Year rr_ExpenseExampleYear01 100
3 Years rr_ExpenseExampleYear03 312
5 Years rr_ExpenseExampleYear05 542
10 Years rr_ExpenseExampleYear10 $ 1,201
1 Year rr_AverageAnnualReturnYear01 19.34%
5 Year rr_AverageAnnualReturnYear05   
Since Inception rr_AverageAnnualReturnSinceInception 4.44%
Inception Date rr_AverageAnnualReturnInceptionDate Jan. 31, 2008
BMO Mid-Cap Value Fund | Return After Taxes on Distributions | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.19%
5 Year rr_AverageAnnualReturnYear05 2.58%
10 Year rr_AverageAnnualReturnYear10 7.49%
BMO Mid-Cap Value Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 13.58%
5 Year rr_AverageAnnualReturnYear05 2.47%
10 Year rr_AverageAnnualReturnYear10 7.26%
BMO Mid-Cap Value Fund | RMCVI (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.51%
5 Year rr_AverageAnnualReturnYear05 3.79%
10 Year rr_AverageAnnualReturnYear10 10.63%
BMO Mid-Cap Value Fund | LMCVFI (reflects deduction of fees and no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 18.32%
5 Year rr_AverageAnnualReturnYear05 2.98%
10 Year rr_AverageAnnualReturnYear10 9.64%
[1] Acquired Fund Fees and Expenses represent the pro rata expense indirectly incurred by the Fund as a result of its investment in other investment companies. Total Annual Fund Operating Expenses shown will not correlate to the Fund's ratios of expenses to average net assets appearing in the Financial Highlights tables, which do not include Acquired Fund Fees and Expenses.
[2] 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.