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Walden Asset Management Fund  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Walden Asset Management Fund
Objective [Heading] rr_ObjectiveHeading Investment Goals
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The Walden Asset Management Fund seeks long-term capital growth and income through an actively managed portfolio of stocks, bonds and money market instruments.
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 Walden Asset Management 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 May 01, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover:
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” its portfolio). A higher portfolio turnover 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. For the fiscal year ended December 31, 2018, the Fund’s portfolio turnover rate was 8.47% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 8.47%
Expense Example [Heading] rr_ExpenseExampleHeading Example:
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

The Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The Example assumes a $10,000 investment, a 5% annual return, redemption at the end of each period and that the Fund’s operating expenses remain the same. The Example reflects the fee waiver and expense reimbursement for the duration of the waiver/reimbursement period only.
Expense Example by, Year, Caption [Text] rr_ExpenseExampleByYearCaption Although your actual costs 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 will invest in a diversified portfolio of stocks, bonds and money market instruments, with at least 25% of the Fund’s assets invested in each of the following categories: (i) fixed-income securities, such as U.S. government and agency securities, corporate bonds, money market funds, and cash and (ii) domestic and foreign equity securities, such as common stock. The Fund may invest in companies of any size, but generally focuses on large capitalization companies. The portion of the Fund invested in equity and fixed income securities will vary based on the Adviser’s assessment of the economic and market outlook and the relative attractiveness of stocks, bonds and money market instruments. “Assets” means net assets, plus the amount of borrowing for investment purposes. The Fund will purchase fixed income securities that are primarily rated investment grade. The Fund may invest up to 25% of its assets in foreign equity and fixed income securities.


The Adviser evaluates financially material environmental, social, and governance (ESG) factors as part of the investment decision-making process for the Fund. The Adviser considers financial materiality as it is understood in generally accepted accounting principles—information that would impact the judgment of an informed investor. The Adviser’s ESG analysis considers the range of impacts that ESG factors may have on future revenues, expenses, assets, liabilities and overall risk. The Fund is subject to screening criteria in which the Adviser excludes companies with significant exposure in specific products or services, considering their revenue dependence (share of total revenue derived from undesirable products/services), market share (if a company is a market leader in an undesirable product despite relatively small share of total company revenue), and severity (how proximate is the product or service to the undesirable product—e.g., minor electronic input to a weapon system). Examples of products and services are found on page 29 of the Prospectus in the second paragraph under the heading “Environmental, Social & Governance Guidelines.” In addition, the Adviser utilizes active ownership to encourage more sustainable business policies and practices and greater ESG transparency. The Adviser encourages portfolio companies to improve their ESG performance and transparency through shareholder engagement. Engagement strategies include proxy voting, dialogue with company management and sponsorship of shareholder resolutions, and public policy advocacy.

Risk [Heading] rr_RiskHeading Principal Investment Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

All investments carry a certain amount of risk and the Fund cannot guarantee that it will achieve its investment objective. The value of the Fund’s investments will fluctuate with market conditions and interest rates and the value of your investment in the Fund will also vary. You could lose money on your investment in the Fund, or the Fund could underperform other investments. Investments in the Fund are not deposits of the Adviser or Boston Trust & Investment Management Company and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. Below are the main risks of investing in the Fund.


Market Risk: Market risk refers to the risk related to investments in securities in general and the daily fluctuations in the securities markets.


Equity Risk: The value of the equity securities held by the Fund, and thus the value of the Fund’s shares, can fluctuate — at times dramatically.


Small and Mid Cap Company Risk: These companies may be subject to greater market risks and fluctuations in value than large capitalization companies and may not correspond to changes in the stock market in general.


Interest Rate Risk: Interest rate risk refers to the risk that the value of the Fund’s fixed-income securities can change in response to changes in prevailing interest rates causing volatility and possible loss of value as rates increase. While interest rates have increased recently, they remain low by historical standards and may rise further. Consequently, the risks associated with rising interest rates are heightened. Securities with greater interest rate sensitivity, and longer maturities tend to produce higher yields, but are subject to greater fluctuations in value.


Credit Risk: Credit risk refers to the risk related to the credit quality of the issuer of a security held in the Fund’s portfolio.


Foreign Investment Risk: Foreign investing involves risks not typically associated with U.S. investments, including adverse political, regulatory, social and economic developments and differing auditing and legal standards. The potential departure of one or more countries from the European Union may have significant political financial consequences for global markets.


Government Risk: The U.S. government’s guarantee of ultimate payment of principal and timely payment of interest on certain U.S. government securities owned by the Fund do not imply that the Fund’s shares are guaranteed or that the price of the Funds’ shares will not fluctuate.


Management Risk: The Adviser’s judgments about the attractiveness, value and potential appreciation of a particular asset class or individual security in which the Fund invests may prove to be incorrect and there is no guarantee that the Adviser’s judgment will produce the desired results.


ESG Criteria Risk: Because the Fund’s criteria exclude securities of certain issuers for nonfinancial reasons, the Fund may forgo some market opportunities available to funds that do not use these criteria.
Risk Lose Money [Text] rr_RiskLoseMoney You could lose money on your investment in the Fund, or the Fund could underperform other investments.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution Investments in the Fund are not deposits of the Adviser or Boston Trust & Investment Management Company and are not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns over time compare with those of a broad measure of market performance. The Fund’s past performance is not an indication of how the Fund will perform in the future. Updated performance information is available at no cost by visiting www.waldenassetmgmt.com or by calling 1-800-282-8782, extension 7050.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and performance table below illustrate the variability of the returns of the Fund, which provides some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and by showing how the Fund’s average annual total returns over time compare with those of a broad measure of market performance.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-282-8782, extension 7050
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.waldenassetmgmt.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture The Fund’s past performance is not an indication of how the Fund will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Average Total Returns (Years ended December 31)
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

Best quarter:

 

Worst quarter:

1Q2012

 

3Q2011

9.29%

 

(10.24)%

For the period January 1, 2019 through March 31, 2019, the aggregate (non-annualized) total return for the Fund was 9.67%.
Year to Date Return, Label rr_YearToDateReturnLabel total return for the Fund
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 9.67%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2012
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 9.29%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (10.24%)
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes (reflects no deduction for fees, expenses or taxes)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After-tax returns are calculated using the highest historical individual federal marginal income tax rate and do not reflect the impact of state and local taxes.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred Actual after-tax returns depend on a shareholder’s tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRA”).
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

After-tax returns are calculated using the highest historical individual federal marginal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a shareholder’s tax situation and may differ from those shown. The after-tax returns are not relevant if you hold your Fund shares in tax-deferred arrangements, such as 401(k) plans or individual retirement accounts (“IRA”).
Caption rr_AverageAnnualReturnCaption Average Annual Total Returns (as of December 31, 2018)
Walden Asset Management Fund | S&P 500® Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (4.38%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 8.49%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 13.12%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.25%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 1999
Walden Asset Management Fund | Bloomberg Barclays U.S. Government/Credit Bond Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.42%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 2.53%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 3.46%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.80%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 1999
Walden Asset Management Fund | FTSE 3 Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 1.86%
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 0.60%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 0.35%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 1.76%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 1999
Walden Asset Management Fund | Walden Asset Management Fund  
Risk/Return: rr_RiskReturnAbstract  
Maximum Sales Charge (load) Imposed on Purchases rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice none
Maximum Deferred Sales Charge (load) rr_MaximumDeferredSalesChargeOverOfferingPrice none
Redemption Fee (as a percentage of amount redeemed, if applicable) rr_RedemptionFeeOverRedemption none
Management Fees rr_ManagementFeesOverAssets 0.75%
Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.29%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.04%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.04%) [1]
Total Annual Fund Operating Expenses After Fee Waiver and/or Expense Reimbursement rr_NetExpensesOverAssets 1.00%
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 102
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 327
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 570
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,267
Annual Return 2009 rr_AnnualReturn2009 14.88%
Annual Return 2010 rr_AnnualReturn2010 12.40%
Annual Return 2011 rr_AnnualReturn2011 1.24%
Annual Return 2012 rr_AnnualReturn2012 8.99%
Annual Return 2013 rr_AnnualReturn2013 20.79%
Annual Return 2014 rr_AnnualReturn2014 8.20%
Annual Return 2015 rr_AnnualReturn2015 (0.17%)
Annual Return 2016 rr_AnnualReturn2016 9.08%
Annual Return 2017 rr_AnnualReturn2017 14.88%
Annual Return 2018 rr_AnnualReturn2018 (1.90%)
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (1.90%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.83%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.61%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 5.06%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Jun. 18, 1999
Walden Asset Management Fund | Walden Asset Management Fund | After Taxes on Distributions  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (2.39%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 5.06%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 8.10%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.50%
Walden Asset Management Fund | Walden Asset Management Fund | After Taxes on Distributions and Sale of Fund Shares  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 (0.76%)
Average Annual Returns, 5 Years rr_AverageAnnualReturnYear05 4.49%
Average Annual Returns, 10 Years rr_AverageAnnualReturnYear10 7.01%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 4.01%
[1] Boston Trust Investment Management, Inc. (the "Adviser") has entered into an expense limitation agreement with the Fund to reduce fees payable to the Adviser and/or reimburse the Fund to limit the Total Fund Operating Expenses of the Fund to 1.00% of its average daily net assets through May 1, 2020 (exclusive of brokerage costs, interest, taxes, dividends, litigation expenses, indemnification, expenses associated with the investments in underlying investment companies and extraordinary expenses (as determined under generally accepted accounting principles)). The Adviser may seek recoupment of fees waived and expenses reimbursed within three years after the expenses occurred if the Fund is able to make the repayment without exceeding the current limitation on Total Fund Operating Expenses, or the limitation in place at the time of initial waiver/reimbursement. The expense limitation agreement may be terminated by the Board of Trustees at any time and will terminate automatically upon termination of the Investment Management Agreement.