Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

BMO FUNDS, INC.

Prospectus Date

rr_ProspectusDate

Dec. 29, 2014

BMO Pyrford International Stock Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

BMO Pyrford International Stock 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. 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 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 year, the Fund’s portfolio turnover rate was 6% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

6.00%

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

Other Expenses, New Fund, Based on Estimates [Text]

rr_OtherExpensesNewFundBasedOnEstimates

“Other Expenses” for the Class A, R3, and R6 shares are based on estimated amounts for the current fiscal year.

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 equity securities of companies located in a number of countries outside the United States. The Fund invests primarily in companies that are located in the countries included, at the time of purchase, in the MSCI EAFE Index, which includes developed countries outside of North America. Although the Fund may invest in companies across all market capitalizations, the Fund invests primarily in companies that, at the time of purchase, have a minimum market capitalization of $2 billion.

The Fund’s sub-adviser is Pyrford International Ltd. (“Pyrford”). Pyrford seeks to minimize losses by adopting a highly defensive investment stance at times of perceived high risk, characterized by high valuation levels or high levels of financial leverage. The Fund does not target a specific volatility level, but aims to deliver volatility significantly below that of the MSCI EAFE Index by being zero weight in any country, sector, or stock that Pyrford believes has very poor value as measured by established fundamental value metrics (such as dividend yields, return on equity, and P/E ratios).

In determining where a company is located, the sub-adviser primarily relies on the country where the company is incorporated, but also may consider the country where the company’s revenues are derived and the primary market listing for the class of shares to be purchased. Although the Fund invests primarily in companies that are included in the MSCI EAFE Index, the Fund may invest up to 20% of its net assets in companies located in countries not represented in this index, including emerging market countries.

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.

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. 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.

Small-Cap Company 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.

Currency Risks. To the extent that the Fund invests directly in foreign (non-U.S.) currencies or in securities denominated in, or that trade in, foreign (non-U.S.) currencies, it is subject to the risk that those currencies will decline in value relative to the U.S. dollar or, in the case of hedging positions, that the U.S. dollar will decline in value relative to the currency being hedged.

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.

Management Risks. Pyrford’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 One Year or Less [Text]

rr_PerformanceOneYearOrLess

Because Class A, Class R3, and Class R6 shares have not been offered for a full calendar year, the information provided represents returns of Class Y and Class I shares.

Performance Additional Market Index [Text]

rr_PerformanceAdditionalMarketIndex

The Morgan Stanley Capital International Europe, Australasia, Far East Index (EAFE) is a free-float adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets, excluding the United States and Canada.

The Lipper International Multi-Cap Core Funds Index (LIMCCFI) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.

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 2012-2013)

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The bar chart does not reflect the payment of any sales charges. If these charges had been reflected, the returns shown would have been lower.

Bar Chart Footnotes [Text Block]

rr_BarChartFootnotesTextBlock

* The bar chart does not reflect the payment of any sales charges. If these charges had been reflected, the returns shown would have been lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

The return for the Class Y shares of the Fund from January 1, 2014 through September 30, 2014 was 2.75%.

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

	Quarter Ended		Returns
Best quarter		9/30/2013		7.05	%
Worst quarter		6/30/2012		(3.01)	%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns through 12/31/13

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, Class A, Class R3, and Class R6 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, Class A, Class R3, and Class R6 will vary.

The Morgan Stanley Capital International Europe, Australasia, Far East Index (EAFE) is a free-float adjusted market capitalization weighted index that is designed to measure the equity market performance of developed markets, excluding the United States and Canada.

The Lipper International Multi-Cap Core Funds Index (LIMCCFI) tracks the total return performance of the 30 largest mutual funds included in this Lipper category.

BMO Pyrford International Stock 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

^[1]

Redemption Fee (as a percentage of amount redeemed, for shares held less than 30 days)

rr_RedemptionFeeOverRedemption

2.00%

Management Fees

rr_ManagementFeesOverAssets

0.74%

Distribution (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.53%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.27%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[3]

Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

1.24%

^[3]

1 Year

rr_ExpenseExampleYear01

126

3 Years

rr_ExpenseExampleYear03

400

5 Years

rr_ExpenseExampleYear05

694

10 Years

rr_ExpenseExampleYear10

1,531

2012

rr_AnnualReturn2012

15.54%

2013

rr_AnnualReturn2013

14.91%

Year to Date Return, Label

rr_YearToDateReturnLabel

The return for the Class Y shares of the Fund from January 1, 2014 through September 30, 2014

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Sep. 30, 2014

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

2.75%

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best quarter

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2013

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.05%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst quarter

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Jun. 30, 2012

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.01%)

1 Year

rr_AverageAnnualReturnYear01

14.91%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

15.12%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 29, 2011

^[4]

BMO Pyrford International Stock 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

0.74%

Distribution (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.28%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.02%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[3]

Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

0.99%

^[3]

1 Year

rr_ExpenseExampleYear01

101

3 Years

rr_ExpenseExampleYear03

322

5 Years

rr_ExpenseExampleYear05

560

10 Years

rr_ExpenseExampleYear10

1,245

1 Year

rr_AverageAnnualReturnYear01

15.21%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

15.44%

^[4]

Inception Date

rr_AverageAnnualReturnInceptionDate

Dec. 29, 2011

^[4]

BMO Pyrford International Stock 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 (as a percentage of amount redeemed, for shares held less than 30 days)

rr_RedemptionFeeOverRedemption

2.00%

Management Fees

rr_ManagementFeesOverAssets

0.74%

Distribution (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other Expenses

rr_OtherExpensesOverAssets

0.28%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.27%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[3]

Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

1.24%

^[3]

1 Year

rr_ExpenseExampleYear01

620

3 Years

rr_ExpenseExampleYear03

880

5 Years

rr_ExpenseExampleYear05

1,159

10 Years

rr_ExpenseExampleYear10

1,955

BMO Pyrford International Stock Fund | Class R3

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

none

Management Fees

rr_ManagementFeesOverAssets

0.74%

Distribution (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other Expenses

rr_OtherExpensesOverAssets

0.28%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

1.52%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[3]

Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

1.49%

^[3]

1 Year

rr_ExpenseExampleYear01

152

3 Years

rr_ExpenseExampleYear03

490

5 Years

rr_ExpenseExampleYear05

852

10 Years

rr_ExpenseExampleYear10

1,871

BMO Pyrford International Stock 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 (as a percentage of amount redeemed, for shares held less than 30 days)

rr_RedemptionFeeOverRedemption

none

Management Fees

rr_ManagementFeesOverAssets

0.74%

Distribution (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

0.13%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

0.87%

Fee Waiver and Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(0.03%)

^[3]

Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement

rr_NetExpensesOverAssets

0.84%

^[3]

1 Year

rr_ExpenseExampleYear01

86

3 Years

rr_ExpenseExampleYear03

287

5 Years

rr_ExpenseExampleYear05

506

10 Years

rr_ExpenseExampleYear10

1,135

BMO Pyrford International Stock Fund | Return After Taxes on Distributions | Class Y

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

14.37%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

14.75%

^[4]

BMO Pyrford International Stock Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Y

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

9.02%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

11.93%

^[4]

BMO Pyrford International Stock Fund | EAFE (reflects no deduction of fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

22.78%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

20.71%

^[4]

BMO Pyrford International Stock Fund | LIMCCFI (reflects deduction of fees and no deduction for sales charges or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

21.05%

^[4]

Since Inception

rr_AverageAnnualReturnSinceInception

20.16%

^[4]

[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] "Other Expenses" for the Class A, R3, and R6 shares are based on estimated amounts for the current fiscal year.

[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 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, 0.99% for Class I, 1.24% for Class A, 1.49% for Class R3, and 0.84% for Class R6 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.

[4] Because Class A, Class R3, and Class R6 shares have not been offered for a full calendar year, the information provided represents returns of Class Y and Class I shares. Class A (without the reflection of the payment of sales charges), Class R3, and Class R6 shares would have substantially similar annual returns because the shares are invested in the same portfolio of securities. The performance of Class A shares (without the reflection of the payment of sales charges) will be the same as the Class Y shares because the Class A and Class Y shares have the same Total Annual Fund Operating Expenses. However, Class A shares do charge a front-end sales charge, so the performance of Class A shares reflecting the payment of sales charges would be lower than Class Y shares. The performance of Class R3 and R6 shares will be different from the Class Y and Class I shares (Class R3 shares' performance will be lower and Class R6 shares' performance will be higher) because they have different Total Annual Fund Operating Expenses.