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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName BMO FUNDS, INC.
Prospectus Date rr_ProspectusDate Dec. 29, 2017
BMO Government Money Market Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Government Money Market Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To provide current income consistent with stability of principal.
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, 2018
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 ratio 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, 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 the Adviser’s agreement to waive fees and reimburse expenses through December 31, 2018. 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 obligations issued and/or guaranteed by the U.S. government or by its agencies or instrumentalities and in repurchase agreements secured by such obligations (collectively referred to as U.S. government securities). The Fund operates as a “government money market fund” within the meaning of Rule 2a-7 under the Investment Company Act of 1940, as amended. As such, the Fund invests at least 99.5% of its assets in U.S. government securities and in cash. The Fund invests its assets in high quality, short-term money market instruments and repurchase agreements.

The Fund may invest only in securities which have been determined by the Adviser to present minimal credit risks to the Fund, based on the Adviser’s consideration of a number of factors including, but not limited to, financial condition, sources of liquidity, ability to react to market-wide and issuer- or guarantor-specific events, and positions within the industry and industry strength. U.S. government securities present minimal credit risk by definition under applicable regulation. The Adviser uses a “bottom-up” approach, which evaluates debt securities against the context of broader market factors such as the cyclical trend in interest rates, the shape of the yield curve, and debt security supply factors.

The Fund invests in the securities of U.S. government-sponsored entities that are not backed by the full faith and credit of the U.S. government, but are supported through federal loans or other benefits, including the Federal Home Loan Banks (FHLBs), Federal National Mortgage Association (Fannie Mae), and Federal Home Loan Mortgage Corporation (Freddie Mac). The Fund also may invest in the securities of U.S. government-sponsored entities that are supported by the full faith and credit of the U.S. government, such as the Government National Mortgage Association (Ginnie Mae). Finally, the Fund may invest in the securities of governmental entities that have no explicit financial support from the U.S. government, but are regarded as having implied support because the U.S. government sponsors their activities, including the Farm Credit Administration and the Financing Corporation.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock You could lose money by investing in the Fund. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so. 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 Adviser has no legal obligation to provide financial support to the Fund, and you should not expect that the Adviser will provide financial support to the Fund at any time. In addition, the Fund is subject to the following risks.

Call Risks. If the securities in which the Fund invests are redeemed by the issuer before maturity (or “called”), the Fund may have to reinvest the proceeds in securities that pay a lower interest rate, which may decrease the Fund’s yield. This will most likely happen when interest rates are declining.

Credit Risks. Credit risk is the possibility that an issuer or counterparty will default on a security or repurchase agreement by failing to pay interest or principal when due. If an issuer defaults, the Fund may lose money. Lower credit ratings correspond to higher credit risk.

Government Obligations Risks. No assurance can be given that the U.S. government will provide financial support to U.S. government-sponsored agencies or instrumentalities where it is not obligated to do so by law (such as Fannie Mae or Freddie Mac). As a result, a risk exists that these entities will default on a financial obligation.

Income Risks. The Fund’s income could decline due to falling market interest rates. In a falling interest rate environment, the Fund may be required to invest its assets in lower-yielding securities.

Interest Rate Risks. Prices of fixed income securities rise and fall in response to changes in the interest rate paid by similar securities. Generally, when interest rates rise, prices of fixed income securities fall. Interest rate changes have a greater effect on the price of fixed income securities with longer maturities. Interest rate changes also are influenced by a number of factors including government policy, inflation expectations, and supply and demand.

Liquidity Risks. Liquidity risk refers to the possibility that the trading market for a particular type of security becomes less liquid or the Fund may not be able to sell or buy a security or close out an investment contract at a favorable price or time. Consequently, the Fund may have to accept a lower price to sell a security, sell other securities to raise cash, or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. Infrequent trading of securities also may lead to an increase in their price volatility. Illiquidity may result from political, economic, or issuer specific events or overall market disruptions. Additionally, significant redemptions by large investors in the Fund could have a material adverse effect on the Fund’s other shareholders and the net asset value could be affected by forced selling during periods of high redemption pressures and/or illiquid markets.

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.

Regulatory Changes Risk. The SEC adopted changes to the rules that govern the way in which money market funds are operated which took effect in 2016. These changes: (i) categorized all money market funds as either institutional, retail, or government money market funds; (ii) require funds operating as government money market funds to invest at least 99.5% of their assets in U.S. government securities, repurchase agreements secured thereby or cash; (iii) require institutional funds to operate with a floating net asset value; and (iv) require institutional and retail funds to adopt policies and procedures regarding “liquidity fees” and “redemption gates,” and permit (but not require) government money market funds to do the same. These changes also amended the diversification, stress testing, and disclosure requirements applicable to money market funds. The full effects of the changes on the Fund’s investment strategies, operations, and/or return potential are not yet known.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money by investing in the Fund.
Risk Money Market Fund [Text] rr_RiskMoneyMarketFund Although the Fund seeks to preserve the value of your investment at $1.00 per share, it cannot guarantee it will do so.
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 have varied from year to year, while the table compares the Fund’s average annual total returns to the returns of an average of money funds with similar objectives and an index of funds with similar investment objectives. Please keep in mind that past performance does not represent how the Fund will perform in the future. Investors may obtain the Fund’s current 7-Day Net Yield or updated performance information at www.bmofundsus.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 have varied from year to year, while the table compares the Fund’s average annual total returns to the returns of an average of money funds with similar objectives and an index of funds with similar investment objectives.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The iMoneyNet, Inc. Government Money Market Index (INGMMI) is an average of money funds with investment objectives similar to that of the Fund.

The Lipper U.S. Government Money Market Funds Index (LUSGMMFI) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.bmofundsus.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Please keep in mind that past performance does not represent how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Premier Class—Annual Total Returns (calendar years 2007-2016)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The return for the Premier Class shares of the Fund from January 1, 2017 through September 30, 2017 was 0.47%.

During the periods shown in the bar chart for the Fund:
    Quarter Ended      Returns  
Best quarter     6/30/2007         1.28 % 
Worst quarter     3/31/2014         0.00 % 

7-Day Net Yield as of December 31, 2016 was 0.31%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns through 12/31/16
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The iMoneyNet, Inc. Government Money Market Index (INGMMI) is an average of money funds with investment objectives similar to that of the Fund.

The Lipper U.S. Government Money Market Funds Index (LUSGMMFI) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.
Money Market Seven Day Yield, Caption [Text] rr_MoneyMarketSevenDayYieldCaption 7-Day Net Yield as of December 31, 2016
Money Market Seven Day Yield rr_MoneyMarketSevenDayYield 0.31%
BMO Government Money Market Fund | Class Y  
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
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.19% [1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.31%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.51%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.46% [3]
1 Year rr_ExpenseExampleYear01 $ 47
3 Years rr_ExpenseExampleYear03 159
5 Years rr_ExpenseExampleYear05 280
10 Years rr_ExpenseExampleYear10 636
1 Year rr_ExpenseExampleNoRedemptionYear01 47
3 Years rr_ExpenseExampleNoRedemptionYear03 159
5 Years rr_ExpenseExampleNoRedemptionYear05 280
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 636
1 Year rr_AverageAnnualReturnYear01 0.01%
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years rr_AverageAnnualReturnYear10 0.70%
Inception Date rr_AverageAnnualReturnInceptionDate May 17, 2004
BMO Government Money Market Fund | Premier Class  
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
Redemption Fee rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.19% [1]
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.06%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.26%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.05%) [3]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.21% [3]
1 Year rr_ExpenseExampleYear01 $ 22
3 Years rr_ExpenseExampleYear03 79
5 Years rr_ExpenseExampleYear05 141
10 Years rr_ExpenseExampleYear10 326
1 Year rr_ExpenseExampleNoRedemptionYear01 22
3 Years rr_ExpenseExampleNoRedemptionYear03 79
5 Years rr_ExpenseExampleNoRedemptionYear05 141
10 Years rr_ExpenseExampleNoRedemptionYear10 $ 326
2007 rr_AnnualReturn2007 5.11%
2008 rr_AnnualReturn2008 2.32%
2009 rr_AnnualReturn2009 0.37%
2010 rr_AnnualReturn2010 0.07%
2011 rr_AnnualReturn2011 0.02%
2012 rr_AnnualReturn2012 0.01%
2013 rr_AnnualReturn2013 0.01%
2014 rr_AnnualReturn2014 0.01%
2015 rr_AnnualReturn2015 0.01%
2016 rr_AnnualReturn2016 0.16%
Year to Date Return, Label rr_YearToDateReturnLabel The return for the Premier Class shares of the Fund from January 1, 2017 through September 30, 2017
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2017
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.47%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2007
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.28%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Mar. 31, 2014
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn none
1 Year rr_AverageAnnualReturnYear01 0.16%
5 Years rr_AverageAnnualReturnYear05 0.04%
10 Years rr_AverageAnnualReturnYear10 0.80%
Inception Date rr_AverageAnnualReturnInceptionDate May 28, 2004
BMO Government Money Market Fund | INGMMI (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Years rr_AverageAnnualReturnYear05 0.01%
10 Years rr_AverageAnnualReturnYear10 0.58%
BMO Government Money Market Fund | LUSGMMFI (reflects deduction of fees and no deduction for sales charges or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.03%
5 Years rr_AverageAnnualReturnYear05 0.02%
10 Years rr_AverageAnnualReturnYear10 0.65%
[1] The management fee disclosed is a blended fee based on the Fund’s total assets as of August 31, 2017. Under the investment advisory agreement, the Fund pays a management fee of 0.20% on the Fund’s first $2 billion of average daily net assets, 0.185% on the next $2 billion of average daily net assets, 0.17% on the next $2 billion of average daily net assets, 0.155% on the next $2 billion of average daily net assets, and 0.14% on assets in excess of $8 billion.
[2] 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 ratio of expenses to average net assets appearing in the Financial Highlights tables, which do not include Acquired Fund Fees and Expenses.
[3] 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 0.45% for Class Y and 0.20% for Premier Class through December 31, 2018. This expense limitation agreement may not be terminated prior to December 31, 2018 without the consent of the Fund’s Board of Directors, unless terminated due to the termination of the investment advisory agreement.