v3.25.1
Average Annual Total Returns
 12 Months Ended 44 Months Ended 52 Months Ended 60 Months Ended 72 Months Ended 120 Months Ended
Apr. 30, 2025
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
Dec. 31, 2024
FPA Crescent Fund - Institutional and Investor Class Shares | Institutional Class              
Prospectus [Line Items]              
Average Annual Return, Percent   13.96%     9.95%   7.85%
FPA Crescent Fund - Institutional and Investor Class Shares | Institutional Class | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   11.53%     8.39%   6.38%
FPA Crescent Fund - Institutional and Investor Class Shares | Institutional Class | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent [1]   9.87%     7.65%   6.00%
FPA Crescent Fund - Institutional and Investor Class Shares | Investor Class              
Prospectus [Line Items]              
Average Annual Return, Percent [2]   13.85%     9.84%   7.74%
FPA Crescent Fund - Institutional and Investor Class Shares | MSCI All Country World Index (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent   17.49%     10.06%   9.23%
FPA Crescent Fund - Institutional and Investor Class Shares | S&P 500 (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent   25.02%     14.53%   13.10%
FPA Crescent Fund - Institutional and Investor Class Shares | 60%/40% S&P 500 Index/Bloomberg U.S. Aggregate Bond Index (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent   15.04%     8.67%   8.52%
FPA Crescent Fund - Institutional and Investor Class Shares | Consumer Price Index (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent   2.90%     4.20%   3.01%
FPA Crescent Fund - Supra Institutional Class Shares | Supra Institutional Class              
Prospectus [Line Items]              
Average Annual Return, Percent   14.06%   12.34%      
Performance Inception Date Sep. 04, 2020            
FPA Crescent Fund - Supra Institutional Class Shares | Supra Institutional Class | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent [3]   11.62%   10.68%      
FPA Crescent Fund - Supra Institutional Class Shares | Supra Institutional Class | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent [3]   9.93%   9.57%      
FPA Crescent Fund - Supra Institutional Class Shares | MSCI All Country World Index (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent 11.05% 17.49%          
FPA Crescent Fund - Supra Institutional Class Shares | S&P 500 (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent 15.05% 25.02%          
FPA Crescent Fund - Supra Institutional Class Shares | 60%/40% S&P 500 Index/Bloomberg U.S. Aggregate Bond Index (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent 8.19% 15.04%          
FPA Crescent Fund - Supra Institutional Class Shares | Consumer Price Index (reflects no deductions for fees, expenses, or taxes)              
Prospectus [Line Items]              
Average Annual Return, Percent 4.79% 2.90%          
FPA Flexible Fixed Income Fund - Institutional and Advisor Class | Institutional Class              
Prospectus [Line Items]              
Average Annual Return, Percent   5.29%     3.52% 3.56%  
Performance Inception Date Dec. 30, 2018            
FPA Flexible Fixed Income Fund - Institutional and Advisor Class | Institutional Class | After Taxes on Distributions              
Prospectus [Line Items]              
Average Annual Return, Percent [4]   4.10%     2.21% 2.30%  
FPA Flexible Fixed Income Fund - Institutional and Advisor Class | Institutional Class | After Taxes on Distributions and Sales              
Prospectus [Line Items]              
Average Annual Return, Percent [4]   3.94%     2.22% 2.27%  
FPA Flexible Fixed Income Fund - Institutional and Advisor Class | Advisor Class              
Prospectus [Line Items]              
Average Annual Return, Percent   5.16% 3.17%        
Performance Inception Date Apr. 19, 2021            
FPA Flexible Fixed Income Fund - Institutional and Advisor Class | Bloomberg U.S. Universal Bond Index              
Prospectus [Line Items]              
Average Annual Return, Percent   2.04%     0.06% 1.54%  
FPA Flexible Fixed Income Fund - Institutional and Advisor Class | CPI + 200 Basis Points              
Prospectus [Line Items]              
Average Annual Return, Percent   4.98%     6.30% 5.98%  
[1] 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. Actual after-tax returns depend upon an investor's tax situation and may differ from those shown. After-tax returns presented here are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs"). Early withdrawal from a 401(k) account or an IRA could lead to taxation of the withdrawn amount as ordinary income and could be subject to an additional penalty. The after-tax returns on distributions and sale of Fund shares may be higher than returns before taxes due to the effect of a tax benefit an investor may receive from the realization of capital losses that would have been incurred on the sale of Fund shares.
[2] Investor Class shares commenced operations on April 30, 2024. The performance figures for Investor Class shares include the performance for the Institutional shares for the periods prior to the inception date of Investor Class shares, adjusted for the difference in Institutional Class shares and Investor Class shares expenses. Investor Class shares impose higher expenses than Institutional Class shares. Since Investor Class shares have higher expenses and are therefore more expensive than Institutional Class shares, the returns for Investor Class shares will be lower than the returns shown for Institutional Class shares.
[3] 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. Actual after-tax returns depend upon an investor's tax situation and may differ from those shown. After-tax returns presented here are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs"). Early withdrawal from a 401(k) account or an IRA could lead to taxation of the withdrawn amount as ordinary income and could be subject to an additional penalty. The after-tax returns on distributions and sale of Fund shares may be higher than returns before taxes due to the effect of a tax benefit an investor may receive from the realization of capital losses that would have been incurred on the sale of Fund shares.
[4] 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. Actual after-tax returns depend upon an investor's tax situation and may differ from those shown. After-tax returns presented here are not relevant to investors who hold their Fund shares through tax-deferred arrangements, such as 401(k) plans or individual retirement accounts ("IRAs"). Early withdrawal from a 401(k) account or an IRA could lead to taxation of the withdrawn amount as ordinary income and could be subject to an additional tax penalty. The after-tax returns on distributions and sale of Fund shares may be higher than returns before taxes due to the effect of a tax benefit an investor may receive from the realization of capital losses that would have been incurred on the sale of Fund shares. After-tax returns are shown for Institutional Class Shares only and after-tax returns for classes other than Institutional Class will vary from returns shown for Institutional Class.