v3.25.1
Label Element Value
Short-Term Treasury Portfolio  
Risk/Return: rr_RiskReturnAbstract  
Risk/Return [Heading] rr_RiskReturnHeading Short-Term Treasury Portfolio   May 30, 2025 PORTFOLIO SUMMARY Class I — PRTBX
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock
Short-Term Treasury Portfolio seeks to earn high current income, consistent with safety and liquidity of principal.
Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Portfolio
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock
The table below describes the fees and expenses you would pay if you buy, hold and sell shares of the Portfolio. You may pay other fees, such as brokerage commissions and other fees to financial intermediaries, which are not reflected in the tables and examples below.
Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment)
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Portfolio 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 June 1, 2026
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock
The Portfolio pays 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 Portfolio shares are held in a taxable account. These costs, which are not reflected in Annual Portfolio Operating Expenses or in the example above, affect the Portfolio’s performance. During the most recent fiscal year, the Portfolio’s portfolio turnover rate was 67.72% of the average value of its portfolio.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 67.72%
Expense Example [Heading] rr_ExpenseExampleHeading Expense Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock
This example is intended to help you compare the cost of investing in the Portfolio with the cost of investing in other mutual funds. The example assumes that you invest $10,000 in the Portfolio 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, that the Portfolio’s operating expenses remain the same and that the fee waiver remains in place for the period indicated. 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
Under normal market conditions, the Portfolio invests at least 80% of its assets in direct debt obligations of the United States Treasury, including U.S. Treasury bills, notes and bonds, and other securities issued by the U.S. Treasury. The remainder of the Portfolio’s assets may be invested in U.S. government agency securities, which include debt obligations issued and/or guaranteed as to principal and interest by the U.S. government or its agencies, sponsored enterprises or instrumentalities.
The Portfolio expects to maintain a dollar-weighted average portfolio maturity and duration of zero to three years. Dollar-weighted average portfolio maturity is a dollar-weighted average of the remaining term to maturity of a portfolio of debt securities, while duration is a measure of price sensitivity of a debt security or portfolio of debt securities to relative changes in interest rates. The Portfolio is not a money market fund and does not seek to maintain a stable price per share. The Portfolio’s yield will fluctuate as the securities in which it invests mature and the proceeds are reinvested in securities with different interest rates.
Unlike many fixed income funds that pay out dividends monthly or quarterly, the Portfolio follows a dividend policy that permits (but does not assure that) its net asset value per share to rise by distributing its net investment income and net capital gains, if any, only once a year, thus enabling the Portfolio to retain a greater portion of its assets on which interest may continue to be earned.
Risk [Heading] rr_RiskHeading Principal Investment Risks
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock
The bar chart and average annual total return table provide an indication of the risks of investing in the Portfolio by showing yearly changes in its performance over the last ten calendar years and by showing how its average annual total returns for various periods compare with a broad-based market index, which is described in “Descriptions of Market Indexes” in the Portfolio’s Prospectus. If the investment adviser had not agreed to waive or reimburse certain Portfolio expenses during this period, the Portfolio’s returns would have been less than those shown. Past performance (before and after taxes) is not an indication of how the Portfolio will perform in the future.
More recent performance information for the Portfolio can be obtained by visiting the Portfolio’s website, www.permanentportfoliofunds.com, or by calling the Portfolio’s Shareholder Services Office toll free at (800) 531‑5142.
Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The bar chart and average annual total return table provide an indication of the risks of investing in the Portfolio by showing yearly changes in its performance over the last ten calendar years and by showing how its average annual total returns for various periods compare with a broad-based market index, which is described in “Descriptions of Market Indexes” in the Portfolio’s Prospectus.
Performance Availability Phone [Text] rr_PerformanceAvailabilityPhone (800) 531‑5142
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.permanentportfoliofunds.com
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture Past performance (before and after taxes) is not an indication of how the Portfolio will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Short-Term Treasury Portfolio Annual Total Returns Years Ended December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock
The year-to-date return through the calendar quarter ended March 31, 2025 was 1.27%.
Highest/lowest quarterly return during the period shown:
Highest Quarter    Lowest Quarter
3rd Quarter 2024
1.89%
  
3rd Quarter 2022
-1.54%
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns (for the periods ended December 31, 2024)
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate After‑tax returns are calculated using the historical highest individual federal marginal income tax rates 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 an investor’s tax situation and may differ from those shown. In particular, after‑tax returns are not relevant to investors who hold their shares through tax advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Performance Table Explanation after Tax Higher rr_PerformanceTableExplanationAfterTaxHigher “Return After Taxes on Distributions and Sale of Portfolio Shares” may be higher than the other return figures for the same period. A higher after‑tax return can occur when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder.
Performance Table Narrative rr_PerformanceTableNarrativeTextBlock
After‑tax returns are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. “Return After Taxes on Distributions and Sale of Portfolio Shares” may be higher than the other return figures for the same period. A higher after‑tax return can occur when a capital loss occurs upon redemption and translates into an assumed tax deduction that benefits the shareholder. Actual after‑tax returns depend on an investor’s tax situation and may differ from those shown. In particular, after‑tax returns are not relevant to investors who hold their shares through tax advantaged arrangements, such as 401(k) plans or individual retirement accounts (“IRAs”).
Short-Term Treasury Portfolio | Risk Lose Money [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock An investment in the Portfolio is not guaranteed; you may lose money by investing in the Portfolio.
Short-Term Treasury Portfolio | Market risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Market risk — the value of the Portfolio’s assets will fluctuate as the U.S. government securities market fluctuates. These fluctuations may cause the price of a security to decline for short- or long-term periods and cause the security to be worth less than it was worth when purchased by the Portfolio, or less than it was worth at an earlier time.
Short-Term Treasury Portfolio | Epidemic or pandemic risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Epidemic or pandemic risk — health crises caused by outbreaks of disease may create, initiate, or exacerbate existing or pre-existing political, social, and economic risks in the United States or globally. The impact of such epidemics and pandemics that may arise in the future could negatively affect the economic, investment or operational performance of individual countries, economies, asset classes, industries, and sectors in significant and unforeseen ways. Further, such circumstances could continue for an extended period of time and may continue to adversely affect the value and liquidity of the Portfolio’s investments. In addition, governments, their regulatory agencies, or their self-regulatory organizations may take actions in response to such pandemics and epidemics, including providing significant fiscal and monetary policy support to local and global economies and financial markets. Such actions could result in interest rate volatility, inflation or deflation, or the rapid expansion of public debt. The ultimate impact or success of those measures on the economy or financial markets is unknown and may not be known for some time. Actions taken in response to the Covid-19 pandemic continue to impact the United States and other economies. Further, the effect of such measures on the Portfolio’s investments or on the issuers of such investments are also unknown and could adversely impact the Portfolio’s investment performance.
Short-Term Treasury Portfolio | U S government and agency securities risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
U.S. government and agency securities risk — the Portfolio invests primarily in securities issued by the U.S. Treasury and may also invest in U.S. government agency securities (such as securities issued by Government National Mortgage Association (“Ginnie Mae”), Federal National Mortgage Association (“Fannie Mae”) or Federal Home Loan Mortgage Corporation (“Freddie Mac”)). U.S. government and agency securities are subject to market risk, interest rate risk and credit risk. Securities, such as those issued or guaranteed by the U.S. Treasury or Ginnie Mae, that are backed by the full-faith-and- credit of the United States, are guaranteed only as to the timely payment of interest and principal when held to maturity, but the market prices for such securities are not guaranteed and will fluctuate. Notwithstanding that these securities are backed by the full-faith-and-credit of the United States, circumstances could arise that could prevent the payment of interest or principal. This would result in losses to the Portfolio. Securities issued or guaranteed by U.S. government agencies, such as Fannie Mae and Freddie Mac, are not backed by the full-faith-and-credit of the United States and no assurance can be given that the U.S. government will provide financial support. Therefore, U.S. government agency securities that are not backed by the full-faith-and-credit of the United States are subject to greater credit risk.
Short-Term Treasury Portfolio | Security selection risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Security selection risk — securities selected for the Portfolio may perform differently than expected.
Short-Term Treasury Portfolio | Inflation risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Inflation risk — the value of assets or income from investments will be less in the future as inflation decreases the value of money. As inflation increases, the value of the Portfolio’s assets can decline as can the value of the Portfolio’s distributions.
Short-Term Treasury Portfolio | Interest rate risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Interest rate risk — changes in interest rates will affect the value of the Portfolio’s investments. Generally, prices of debt securities tend to fall when prevailing interest rates rise and rise when prevailing interest rates fall. Typically, the longer the maturity or duration of a debt security, the greater the effect a change in interest rates could have on the security’s price. Thus, the Portfolio’s sensitivity to interest rate risk will increase with any increase in the Portfolio’s overall duration. During periods of very low interest rates, income from the Portfolio’s investments may not be sufficient to offset its expenses.
Short-Term Treasury Portfolio | Credit risks [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Credit risk — an issuer or guarantor of debt securities may be unable or unwilling to pay principal and interest when due, or otherwise honor its obligations.
Short-Term Treasury Portfolio | Income risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Income risk — the Portfolio’s income generally declines during periods of falling interest rates because the Portfolio must reinvest the proceeds it receives from existing investments (upon their maturity, prepayment, amortization, call or buy-back) at a lower rate of interest or return.
Short-Term Treasury Portfolio | Prepayment and extension risk [Member]  
Risk/Return: rr_RiskReturnAbstract  
Risk [Text Block] rr_RiskTextBlock
   
Prepayment and extension risk — a security held by the Portfolio may be paid off by the issuer more quickly than originally anticipated, thereby shortening duration, and the Portfolio may then have to reinvest the proceeds in an investment offering a lower yield, and may not benefit from any increase in value that might otherwise result from declining interest rates and may lose any premium it paid to acquire the security. Higher interest rates generally
 
result in slower payoffs, which effectively increase duration, heighten interest rate risk, and may increase the magnitude of resulting price declines.
Short-Term Treasury Portfolio | 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 the lower of original purchase price or sale proceeds) rr_MaximumDeferredSalesChargeOverOther none
Management Fees rr_ManagementFeesOverAssets 1.19%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets
Other Operating Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Portfolio Operating Expenses rr_ExpensesOverAssets 1.21%
Fee Waivers and Expense Limitation rr_FeeWaiverOrReimbursementOverAssets (0.56%) [1]
Total Annual Portfolio Operating Expenses After Fee Waivers and Expense Limitation rr_NetExpensesOverAssets 0.65%
1 Year rr_ExpenseExampleYear01 $ 67
3 Years rr_ExpenseExampleYear03 330
5 Years rr_ExpenseExampleYear05 614
10 Years rr_ExpenseExampleYear10 $ 1,423
2015 rr_AnnualReturn2015 (0.64%)
2016 rr_AnnualReturn2016 (0.25%)
2017 rr_AnnualReturn2017 0.12%
2018 rr_AnnualReturn2018 1.16%
2019 rr_AnnualReturn2019 1.76%
2020 rr_AnnualReturn2020 0.10%
2021 rr_AnnualReturn2021 (0.74%)
2022 rr_AnnualReturn2022 (2.28%)
2023 rr_AnnualReturn2023 3.79%
2024 rr_AnnualReturn2024 4.11%
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Mar. 31, 2025
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 1.27%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Quarter
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Sep. 30, 2024
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 1.89%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Quarter
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2022
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (1.54%)
1 Year rr_AverageAnnualReturnYear01 4.11%
5 Years rr_AverageAnnualReturnYear05 0.97%
10 Years rr_AverageAnnualReturnYear10 0.70%
Since Inception rr_AverageAnnualReturnSinceInception 2.16% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 26, 1987
Short-Term Treasury Portfolio | Return After Taxes on Distributions | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 3.00%
5 Years rr_AverageAnnualReturnYear05 0.59%
10 Years rr_AverageAnnualReturnYear10 0.41%
Since Inception rr_AverageAnnualReturnSinceInception 1.62% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 26, 1987
Short-Term Treasury Portfolio | Return After Taxes on Distributions and Sale of Portfolio Shares | Class I  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 2.43%
5 Years rr_AverageAnnualReturnYear05 0.58%
10 Years rr_AverageAnnualReturnYear10 0.41%
Since Inception rr_AverageAnnualReturnSinceInception 1.52% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 26, 1987
Short-Term Treasury Portfolio | FTSE 3-Month U.S. Treasury Bill Index (reflects no deduction for fees, expenses or taxes)  
Risk/Return: rr_RiskReturnAbstract  
1 Year rr_AverageAnnualReturnYear01 5.45%
5 Years rr_AverageAnnualReturnYear05 2.54%
10 Years rr_AverageAnnualReturnYear10 1.79%
Since Inception rr_AverageAnnualReturnSinceInception 3.07% [2]
Inception Date rr_AverageAnnualReturnInceptionDate May 26, 1987
[1] Pursuant to an Advisory Fee Waiver and Expense Assumption Agreement effective through June 1, 2026, the Portfolio’s investment adviser has contractually agreed to waive a portion of its Management Fee payable by the Portfolio so that the Management Fee paid by the Portfolio does not exceed an annual rate of .6250% of the Portfolio’s average daily net assets. The Agreement may be terminated or amended only with the approval of the Trust’s Board of Trustees.
[2] Inception date for Class I shares was May 26, 1987. Date used to calculate performance since inception for the index is the inception date of the Class I shares.