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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 Ultra Short Tax-Free Fund
  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading BMO Ultra Short Tax-Free Fund
Objective [Heading] rr_ObjectiveHeading Investment Objective:
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock To provide current income exempt from federal income tax consistent with preservation of capital.
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
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 128% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 128.00%
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. 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 Under normal circumstances, the Fund invests at least 80% of its assets in municipal securities, the income from which is exempt from federal income tax (including the federal alternative minimum tax (AMT)). The Fund normally maintains an average dollar-weighted effective maturity of one year or less. 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.

The Fund invests primarily in municipal securities within the investment grade category (i.e., rated BBB or Baa, or higher, or unrated and considered by the Adviser to be comparable in quality) at the time of purchase. Municipal securities include fixed and floating rate debt obligations of states, territories, and possessions of the U.S., and political subdivisions and financing authorities of these entities that provide income exempt from federal income tax (including federal AMT). Fund investments are selected after assessing factors such as the cyclical trend in interest rates, the shape of the municipal yield curve, tax rates, sector valuation, and municipal bond supply factors.
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 (NAV) 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.

Interest Rate Risk. 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 Risk. 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. Bonds rated lower than BBB or Baa have speculative characteristics.

Call Risk. 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 Risk. 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.

Municipal Securities Risk. 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 Risk. 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.

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, including exchange-traded funds. 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.

Portfolio Turnover Risks. A high portfolio rate (100% or more) may result in the realization and distribution to shareholders of a greater amount of capital gains than if the Fund had a low portfolio turnover rate. Therefore, you may have higher tax liability. High portfolio turnover also may result in higher transaction costs, which may negatively affect Fund performance.
Risk Lose Money [Text] rr_RiskLoseMoney The net asset value (NAV) 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.bmofundsus.com.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns 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.bmofundsus.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 year 2010-2011)
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 1.05%.

During the periods shown in the bar chart for the Fund:
Quarter EndedReturns  
Best quarter9/30/20100.54 %
Worst quarter12/31/20100.05 %
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns through 12/31/11
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 Barclays Capital 1-Year Municipal Bond Index (B1MBI) is the 1-year component of the Barclays Capital Municipal Bond Index, which is an unmanaged index composed of long-term tax-exempt bonds with a minimum credit rating of Baa.

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.
BMO Ultra Short Tax-Free 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 0.42%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.63%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.56% [2]
1 Year rr_ExpenseExampleYear01 57
3 Years rr_ExpenseExampleYear03 195
5 Years rr_ExpenseExampleYear05 344
10 Years rr_ExpenseExampleYear10 780
2010 rr_AnnualReturn2010 1.40%
2011 rr_AnnualReturn2011 1.61%
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 1.05%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2010
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 0.54%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Dec. 31, 2010
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn 0.05%
1 Year rr_AverageAnnualReturnYear01 1.61%
Since Inception rr_AverageAnnualReturnSinceInception 1.59%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2009
BMO Ultra Short Tax-Free 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 0.17%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.01% [1]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.38%
Fee Waiver and Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.07%) [2]
Total Annual Fund Operating Expenses After Fee Waiver and Expense Reimbursement rr_NetExpensesOverAssets 0.31% [2]
1 Year rr_ExpenseExampleYear01 32
3 Years rr_ExpenseExampleYear03 115
5 Years rr_ExpenseExampleYear05 206
10 Years rr_ExpenseExampleYear10 474
1 Year rr_AverageAnnualReturnYear01 1.76%
Since Inception rr_AverageAnnualReturnSinceInception 1.80%
Inception Date rr_AverageAnnualReturnInceptionDate Sep. 30, 2009
BMO Ultra Short Tax-Free Fund | Return After Taxes on Distributions | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.61%
Since Inception rr_AverageAnnualReturnSinceInception 1.59%
BMO Ultra Short Tax-Free Fund | Return After Taxes on Distributions and Sale of Fund Shares | Class Y
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.54%
Since Inception rr_AverageAnnualReturnSinceInception 1.55%
BMO Ultra Short Tax-Free Fund | Blended Benchmark (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 0.80% [3]
Since Inception rr_AverageAnnualReturnSinceInception 0.75% [3]
BMO Ultra Short Tax-Free Fund | B1MBI (reflects deduction of fees and no deduction for sales charges or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 1.58%
Since Inception rr_AverageAnnualReturnSinceInception 1.48%
[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 0.55% for Class Y and 0.30% 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.
[3] The benchmark for the Fund is a blended benchmark, which consists of 50% Barclays Capital 1-Year Municipal Bond Index (B1MBI) and 50% iMoneyNet Money Fund Tax Free National Retail Index (IMNTFNR).