S000001146 [Member] Average Annual Total Returns

4 Months Ended

12 Months Ended

60 Months Ended

120 Months Ended

195 Months Ended

309 Months Ended

345 Months Ended

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Dec. 31, 2025

Bloomberg U.S. Aggregate Bond Index

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

7.30%

(0.36%)

2.01%

ICE BofA 1-3 Year U.S. Treasury Index

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

5.09%

1.79%

1.85%

CLASS M

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

6.06%

2.07%

2.14%

Performance Inception Date

Mar. 31, 1997

CLASS M | After Taxes on Distributions

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

4.30%

0.80%

1.13%

Performance Inception Date

Mar. 31, 1997

CLASS M | After Taxes on Distributions and Sales

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

3.56%

1.02%

^[2]

1.20%

^[2]

Performance Inception Date

Mar. 31, 1997

Class I-3

Prospectus [Line Items]

Performance Inception Date

Aug. 25, 2025

CLASS I

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

6.27%

2.28%

2.35%

Performance Inception Date

Mar. 31, 2000

Administrative Class

Prospectus [Line Items]

Average Annual Return, Percent

^[1]

5.88%

1.96%

2.03%

Performance Inception Date

Sep. 22, 2009

[1]	Class I-3 shares of the Fund have an inception date of August 25, 2025, and therefore do not have a full year of performance history as of the date of this Prospectus.
[2]	The “After Taxes on Distributions and Sale of Fund Shares” return is higher than the “After Taxes on Distributions” return because of realized losses that would have been sustained upon sale of Fund shares immediately after the relevant period.