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Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName MARSHALL FUNDS INC d/b/a BMO FUNDS
Prospectus Date rr_ProspectusDate Dec. 28, 2012
BMO Tax-Free Money Market Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Tax-Free Money Market Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To provide current income exempt from federal income tax 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, 2013
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. 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, 2013. 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 primarily in fixed and floating rate municipal bonds and notes, variable rate demand instruments, and other high-quality, short-term tax-exempt obligations maturing in 397 days or less. Under normal circumstances, the Fund invests its assets so that at least 80% of the annual interest income that the Fund distributes will be exempt from federal income tax, including federal alternative minimum tax (AMT).

To maintain principal preservation, the Adviser places a strict emphasis on credit research. Using fundamental analysis, the Adviser develops an approved list of issuers and securities that meet the Adviser’s standards for minimal credit risk. The Adviser continually monitors the credit risks of all of the Fund’s portfolio securities on an ongoing basis by reviewing financial data and ratings of nationally recognized statistical rating organizations (NRSROs). The securities in which the Fund invests must be rated in one of the two highest short-term rating categories by one or more NRSROs or be determined by the Adviser to be of comparable quality to securities having such ratings (except that U.S. Government securities and shares of other registered money market funds are not subject to this requirement). The Fund invests in compliance with industry-standard regulatory requirements for money market funds for the quality, maturity, diversification, and liquidity of investments.

The Fund seeks to enhance yield by taking advantage of favorable changes in interest rates and reducing the effect of unfavorable changes in interest rates. In seeking to achieve this objective, the Adviser targets a dollar-weighted average portfolio maturity of 60 days or less based on its interest rate outlook. The interest rate outlook is developed by analyzing a variety of factors, such as current and expected U.S. economic growth,current and expected interest rates and inflation, and the Federal Reserve Board’s monetary policy. By developing an interest rate outlook and adjusting the portfolio’s maturity accordingly, the Adviser seeks to position the Fund to take advantage of yield enhancing opportunities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock 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. Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to lose money by investing in the Fund. In addition, the Fund is subject to the following risks.

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 will default on a security 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.

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. 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.

Municipal Securities Risks. Municipal bonds are subject to risks based on many factors, including economic and regulatory developments, changes or proposed changes in the federal and state tax structure, deregulation, court rulings, and other factors. The value of municipal securities may be affected more by supply and demand factors or the creditworthiness of the issuer than by market interest rates. Repayment of municipal securities depends on the ability of the issuer or project backing such securities to generate taxes or revenues. There is a risk that the interest on an otherwise tax-exempt municipal security may be subject to federal income tax.

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 manager will produce the desired results.

Sector Risks. The Fund may invest its assets in municipal securities that finance similar projects, such as those relating to education, health care, transportation, and utilities. 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.

Investments in Other Investment Companies Risks. The Fund may invest in securities issued by other investment companies. By investing in another investment company, there is a risk that the value of the underlying securities of the investment company may decrease. The Fund will also bear its proportionate share of the other investment company’s fees and expenses.
Risk Lose Money [Text] rr_RiskLoseMoney Although the Fund seeks to preserve the value of your investment at $1.00 per share, it is possible to 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 is possible to 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 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 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 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 Class Y—Annual Total Returns (calendar years 2005-2011)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock The return for the Class Y shares of the Fund from January 1, 2012 through September 30, 2012 was 0.03%.

During the periods shown in the bar chart for the Fund:
Quarter EndedReturns  
Best quarter9/30/20070.85 %
Worst quarter9/30/20110.01 %

7-Day Net Yield as of December 31, 2011 was 0.12%.
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns through 12/31/11
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock The iMoneyNet Money Fund Report /Tax-Free National Retail Index (IMNTFNR) is an average of money funds with investment objectives similar to that of the Fund.

The Lipper Tax Exempt Money Market Funds Index (LTEMMFI) is an average of the 30 largest mutual funds in this Lipper category.
Money Market Seven Day Yield, Caption [Text] rr_MoneyMarketSevenDayYieldCaption 7-Day Net Yield as of December 31, 2011
Money Market Seven Day Yield rr_MoneyMarketSevenDayYield 0.12%
BMO Tax-Free 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
Redemption Fee (as a percentage of amount redeemed, for shares held less than 30 days) rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.20%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.34%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.55%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.46% [2]
1 Year rr_ExpenseExampleYear01 47
3 Years rr_ExpenseExampleYear03 167
5 Years rr_ExpenseExampleYear05 298
10 Years rr_ExpenseExampleYear10 681
2005 rr_AnnualReturn2005 2.08%
2006 rr_AnnualReturn2006 3.11%
2007 rr_AnnualReturn2007 3.35%
2008 rr_AnnualReturn2008 2.25%
2009 rr_AnnualReturn2009 0.77%
2010 rr_AnnualReturn2010 0.18%
2011 rr_AnnualReturn2011 0.05%
Year to Date Return, Label rr_YearToDateReturnLabel The return for the Class Y shares of the Fund from January 1, 2012 through September 30, 2012
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Sep. 30, 2012
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 0.03%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2007
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.85%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 0.01%
1 Year rr_AverageAnnualReturnYear01 0.05%
5 Year rr_AverageAnnualReturnYear05 1.31%
Since Inception rr_AverageAnnualReturnSinceInception 1.66%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 22, 2004
BMO Tax-Free Money Market Fund | Class I
  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (Load) Imposed on Purchases (as a percentage of offering price) rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Redemption Fee (as a percentage of amount redeemed, for shares held less than 30 days) rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.20%
Distribution (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.09%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.30%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.21% [2]
1 Year rr_ExpenseExampleYear01 22
3 Years rr_ExpenseExampleYear03 87
5 Years rr_ExpenseExampleYear05 160
10 Years rr_ExpenseExampleYear10 372
1 Year rr_AverageAnnualReturnYear01 0.29%
5 Year rr_AverageAnnualReturnYear05 1.56%
Since Inception rr_AverageAnnualReturnSinceInception 1.92%
Inception Date rr_AverageAnnualReturnInceptionDate Jun. 29, 2005
BMO Tax-Free Money Market Fund | IMNTFNR (reflects deduction of fees and no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Year rr_AverageAnnualReturnYear05 1.02%
Since Inception rr_AverageAnnualReturnSinceInception 1.39%
BMO Tax-Free Money Market Fund | LTEMMFI (reflects deduction of fees and no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.02%
5 Year rr_AverageAnnualReturnYear05 1.02%
Since Inception rr_AverageAnnualReturnSinceInception 1.41%
[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 0.45% for Class Y and 0.20% for Class I through December 31, 2013. The Adviser may not terminate this arrangement prior to December 31, 2013 unless the investment advisory agreement is terminated.