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

The Walden Small Cap Innovations Fund seeks long-term capital growth through an actively managed portfolio of stocks of small capitalization companies.

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 Small Cap Innovations 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 2014-08-01
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. During the most recent fiscal year, the Fund’s portfolio turnover rate was 31.98% of the average value of its portfolio.

Portfolio Turnover, Rate rr_PortfolioTurnoverRate 31.98%
Expenses Restated to Reflect Current [Text] rr_ExpensesRestatedToReflectCurrent Other Expenses have been restated to reflect current fees.
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.
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 invests, under normal circumstances, at least 80% of its assets in a diversified portfolio of equity securities, such as common and preferred stock of domestic small cap companies with innovative products and processes. “Assets” means net assets, plus the amount of borrowing for investment purposes. Shareholders will be given 60 days’ advance notice of any change to this policy. For these purposes, the Adviser defines small cap issuers as those with market capitalizations within the range encompassed by the Russell 2000 Index at the time of purchase. The size of companies in the Russell 2000 Index may change with market conditions. In addition, changes to the composition of the Russell 2000 Index can change the market capitalization range of the companies included in the index. As of June 30, 2013, the market capitalization range of the Russell 2000 Index was between $23 million and $5.8 billion. The Fund seeks to invest in companies with innovative products, services or processes, or that offer environmental or societal benefits.


The Walden Small Cap Innovations Fund incorporates comprehensive environmental, social and governance (ESG) guidelines in portfolio construction. The Fund also seeks to strengthen ESG performance and accountability of portfolio companies through proxy voting, shareholder engagement and public policy advocacy. In selecting stocks, Walden Asset Management (“Walden”), an affiliate of the Adviser, favors investment in companies and institutions it deems to have relatively strong ESG records and seeks to avoid those with inferior ESG performance relative to peers. After investing in a company, Walden may also choose to pursue shareholder advocacy to encourage stronger corporate responsibility and accountability.


Walden researches, evaluates and seeks to promote corporate responsibility in five broad areas of concern: products and services, workplace conditions, community impact, environmental impact and corporate governance. Hence, in each of the five broad areas identified above, and notwithstanding other investment considerations, Walden favors companies judged to demonstrate best practices relative to peers, improvement over time, robust management systems, and accountability through standardized public reporting and responsiveness to shareholders.

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 Boston Trust Investment Management, Inc. (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 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.

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 Boston Trust Investment Management, Inc. (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. Of course, the Fund’s past performance is not necessarily an indication of how the Fund will perform in the future. Updated performance information is available at no cost by visiting www.btim.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 Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex The Fund's benchmark for comparison purposes has been changed from the S&P 500 Index to the Russell 2000 Index . The Russell 2000 Index more accurately reflects the composition of the portfolio of securities held by the Fund.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone 1-800-282-8782
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.btim.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Of course, the Fund's past performance is not necessarily 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:

Q2 2009

 

Q3 2011

21.55%

 

(19.74)%


For the period January 1, 2013 through June 30, 2013, the aggregate (non-annualized) total return for the Fund was 10.99%.

Year to Date Return, Label rr_YearToDateReturnLabel total return for the Fund
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2013
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 10.99%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Best quarter:
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Jun. 30, 2009
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 21.55%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Worst quarter:
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2011
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (19.74%)
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, 2012)
Russell 2000® Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.35% [1]
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 16.80% [1]
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 24, 2008 [1]
S&P 500® Index (reflects no deduction for fees, expenses or taxes)
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 16.00%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.88%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 24, 2008
Walden Small Cap Innovations 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 Fee rr_ManagementFeesOverAssets 0.75%
Distribution (Rule 12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses rr_OtherExpensesOverAssets 0.34% [2]
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 1.09%
Fee Waiver and/or Expense Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.09%) [3]
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 338
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 592
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,321
Annual Return 2009 rr_AnnualReturn2009 31.77%
Annual Return 2010 rr_AnnualReturn2010 25.65%
Annual Return 2011 rr_AnnualReturn2011 (0.79%)
Annual Return 2012 rr_AnnualReturn2012 13.01%
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 13.01%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 17.30%
Average Annual Returns, Inception Date rr_AverageAnnualReturnInceptionDate Oct. 24, 2008
Walden Small Cap Innovations Fund | After Taxes on Distributions
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 12.58%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 16.49%
Walden Small Cap Innovations Fund | After Taxes on Distributions and Sale of Fund Shares
  
Risk/Return: rr_RiskReturnAbstract  
Average Annual Returns, 1 Year rr_AverageAnnualReturnYear01 9.02%
Average Annual Returns, Since Inception rr_AverageAnnualReturnSinceInception 14.89%
[1] The Fund's benchmark for comparison purposes has been changed from the S&P 500 Index to the Russell 2000 Index . The Russell 2000 Index more accurately reflects the composition of the portfolio of securities held by the Fund.
[2] Other Expenses have been restated to reflect current fees.
[3] 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 August 1, 2014 (exclusive of brokerage costs, interest, taxes, dividends, litigation, 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 fiscal years after fees were waived or expenses reimbursed if the Fund is able to make the repayment without exceeding the current limitation on Total Fund Operating Expenses. 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.