Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	BMO FUNDS, INC.
Prospectus Date	rr_ProspectusDate	Dec. 29, 2014
BMO TCH Emerging Markets Bond Fund
Risk/Return:	rr_RiskReturnAbstract
Risk/Return [Heading]	rr_RiskReturnHeading	BMO TCH Emerging Markets Bond Fund
Objective [Heading]	rr_ObjectiveHeading	Investment Objective:
Objective, Primary [Text Block]	rr_ObjectivePrimaryTextBlock	To maximize total return consistent with 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 and hold shares of the Fund. You may qualify for sales charge discounts if you and your family invest, or agree to invest in the future, at least $100,000 in Class A shares of certain BMO Funds. More information about these and other discounts is available from your financial professional and under “How to Buy Shares – Sales Charge” on page 110 of this Prospectus and under “How to Buy Shares – Waivers and Reductions of Sales Charges – Class A Shares” beginning on page 111 of this Prospectus and “How to Buy Shares” beginning on page B-43 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, 2015
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 period ended August 31, 2014, the Fund’s portfolio turnover rate (not annualized) was 72% of the average value of its portfolio.
Portfolio Turnover, Rate	rr_PortfolioTurnoverRate	72.00%
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 $100,000 in Class A shares of certain BMO Funds.
Expense Breakpoint, Minimum Investment Required [Amount]	rr_ExpenseBreakpointMinimumInvestmentRequiredAmount	100,000
Other Expenses, New Fund, Based on Estimates [Text]	rr_OtherExpensesNewFundBasedOnEstimates	“Other Expenses” for Class A shares are based on estimated amounts for the Fund’s current fiscal year.
Expenses Restated to Reflect Current [Text]	rr_ExpensesRestatedToReflectCurrent	Management Fees and Other Expenses have been restated to reflect current fees, effective June 1, 2015.
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, 2015. 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 debt securities of emerging market governments, of companies located in emerging markets, or whose primary business activities or principal trading markets are in emerging markets. Debt securities include sovereign debt instruments and corporate bonds. The Fund’s sub-adviser, Taplin, Canida & Habacht, LLC (TCH), an affiliate of the Adviser, considers emerging markets to be those markets in any country other than Canada, Luxembourg, the U.S., Australia, Austria, Belgium, Denmark, Finland, France, Germany, Greece, Ireland, Israel, Italy, Japan, the Netherlands, New Zealand, Norway, Portugal, Spain, Sweden, Switzerland, and the United Kingdom. TCH may make adjustments to the list of emerging market countries from time to time based on economic criteria, market changes, or other factors. Although the Fund invests primarily in investment grade securities (i.e., rated BBB or Baa, or higher, or unrated and considered by the sub-adviser to be comparable in quality), the Fund may invest in debt securities that are below investment grade, also known as high yield securities or “junk bonds,” generally in accordance with the Fund’s current benchmark, the J.P. Morgan Emerging Markets Bond Index Global Diversified. High yield securities may represent more than 20% of the Index. TCH uses macroeconomic, credit, and market analysis to select portfolio securities. Although the Fund expects to maintain an intermediate- to long-term average effective maturity, there are no maturity restrictions on individual holdings or on the overall portfolio. Effective maturity takes into account the possibility that a bond may have prepayments or may be called by the issuer before its stated maturity date.
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. Foreign Securities Risks. Investing in foreign securities may involve additional risks, including currency-rate fluctuations, political and economic instability, differences in financial reporting standards, less-strict regulation of the securities markets, and possible imposition of foreign withholding taxes. Furthermore, the Fund may incur higher costs and expenses when making foreign investments, which will affect the Fund’s total return. Emerging Markets Risks. Investments in emerging markets can involve risks in addition to and greater than those generally associated with investing in more developed foreign markets, which may make emerging market securities more volatile and potentially less liquid than securities issued in more developed markets. Sovereign Debt Risks. Sovereign debt instruments are subject to the risk that a governmental entity may be unable to pay interest or repay principal on its sovereign debt due to cash flow problems, insufficient foreign currency reserves, or political concerns. If a governmental entity defaults on an obligation, the Fund may have limited recourse against the defaulting government and may lose its investment. 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. 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. Bonds rated lower than BBB or Baa have speculative characteristics. High Yield Securities Risks. High yield securities, also referred to as “junk bonds” or non-investment grade securities, are debt securities rated lower than BBB by Standard & Poor’s or Baa by Moody’s Investors Service. These securities tend to be more sensitive to economic conditions than are higher-rated securities, generally involve more credit risk than securities in the higher-rated categories and are predominantly considered to be speculative. The issuers of high yield securities are typically more leveraged, and the risk of loss due to default by an issuer of high yield securities is significantly greater than issuers of higher-rated securities because such securities are generally unsecured and are often subordinated to other creditors. The Fund may have difficulty disposing of certain high yield securities because there may be a thin trading market for such securities. 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. Liquidity Risks. Liquidity risk refers to the possibility that 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. Management Risks. TCH’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	Performance information is not included because the Fund does not have one full calendar year of performance as of the date of this Prospectus.
Performance One Year or Less [Text]	rr_PerformanceOneYearOrLess	Performance information is not included because the Fund does not have one full calendar year of performance as of the date of this Prospectus.
BMO TCH Emerging Markets Bond 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 (as a percentage of amount redeemed, for shares held less than 30 days)	rr_RedemptionFeeOverRedemption	2.00%
Management Fees	rr_ManagementFeesOverAssets	0.55%	[2]
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	none
Other Expenses	rr_OtherExpensesOverAssets	2.31%	[2],[3]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	2.86%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(2.01%)	[4]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	0.85%	[4]
1 Year	rr_ExpenseExampleYear01	87
3 Years	rr_ExpenseExampleYear03	695
5 Years	rr_ExpenseExampleYear05	1,330
10 Years	rr_ExpenseExampleYear10	3,040
BMO TCH Emerging Markets Bond Fund | Class A
Risk/Return:	rr_RiskReturnAbstract
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price)	rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice	3.50%
Maximum Deferred Sales Charge (Load) (as a percentage of shares redeemed within 18 months of purchase)	rr_MaximumDeferredSalesChargeOverOther	1.00%	[1]
Redemption Fee (as a percentage of amount redeemed, for shares held less than 30 days)	rr_RedemptionFeeOverRedemption	2.00%
Management Fees	rr_ManagementFeesOverAssets	0.55%	[2]
Distribution (12b-1) Fees	rr_DistributionAndService12b1FeesOverAssets	0.25%
Other Expenses	rr_OtherExpensesOverAssets	2.31%	[2],[3]
Total Annual Fund Operating Expenses	rr_ExpensesOverAssets	3.11%
Fee Waiver and Expense Reimbursement	rr_FeeWaiverOrReimbursementOverAssets	(2.11%)	[4]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement	rr_NetExpensesOverAssets	1.00%	[4]
1 Year	rr_ExpenseExampleYear01	448
3 Years	rr_ExpenseExampleYear03	1,085
5 Years	rr_ExpenseExampleYear05	1,745
10 Years	rr_ExpenseExampleYear10	3,508

[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] Management Fees and Other Expenses have been restated to reflect current fees, effective June 1, 2015.

[3] "Other Expenses" for Class A shares are based on estimated amounts for the Fund's current fiscal year.

[4] 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 0.85% for Class I and 1.00% for Class A through December 31, 2015. This expense limitation agreement may not be terminated prior to December 31, 2015 without the consent of the Fund’s Board of Directors, unless terminated due to the termination of the investment advisory agreement.