v3.26.1
Annual Total Returns - Investment Trust Prospectus
 12 Months Ended
Dec. 31, 2025
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CORE PLUS FUND | CORE PLUS FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 7.42% 1.98% 5.61% (15.19%) 0.53% 7.96% 9.04% (1.40%) 4.57% 3.56%
DIVERSIFIED BOND FUND | DIVERSIFIED BOND FUND, I CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 7.38% 1.53% 5.40% (13.70%) (0.56%) 8.25% 8.58% (1.26%) 3.54% 2.72%
HIGH INCOME FUND | HIGH INCOME FUND Y CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 8.80% 7.45% 13.83% (11.20%) 6.53% 7.99% 12.67% (2.01%) 6.98% 17.29%
HIGH-YIELD FUND | HIGH-YIELD FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 8.60% 6.34% 10.23% (11.82%) 4.45% 5.86% 13.21% (3.32%) 5.95% 13.97%
MULTISECTOR INCOME FUND | MULTISECTOR INCOME FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 7.97% 4.87% 7.18% (10.33%) 2.55% 9.14% 9.77% (1.65%) 6.00% 7.29%
PRIME MONEY MARKET FUND | PRIME MONEY MARKET FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 3.96% 4.94% 4.79% 1.35% 0.01% 0.40% 1.82% 1.54% 0.59% 0.10%
SHORT DURATION FUND | SHORT DURATION FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 5.62% 4.68% 4.70% (4.17%) 1.02% 4.02% 3.95% 1.33% 1.41% 1.92%
SHORT DURATION INFLATION PROTECTION BOND FUND | SHORT DURATION INFLATION PROTECTION BOND FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 5.95% 4.15% 3.82% (3.90%) 6.30% 5.06% 4.77% 0.07% 0.73% 3.25%
SHORT DURATION STRATEGIC INCOME FUND | SHORT DURATION STRATEGIC INCOME FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 6.27% 5.57% 5.74% (5.82%) 2.04% 5.44% 5.23% 0.25% 2.80% 5.44%
U.S. GOVERNMENT MONEY MARKET FUND | U.S. GOVERNMENT MONEY MARKET FUND, INVESTOR CLASS                    
Prospectus [Line Items]                    
Annual Return [Percent] 3.94% 4.91% 4.67% 1.26% 0.01% 0.29% 1.79% 1.41% 0.44% 0.03%