v3.25.2
Class D Shares [Member] Average Annual Total Returns - Class D Shares - C000137974 [Member]
 12 Months Ended 60 Months Ended 115 Months Ended
Dec. 31, 2023
Dec. 31, 2023
Dec. 31, 2023
After Taxes on Distributions      
Prospectus [Line Items]      
Average Annual Return, Percent 5.23% 1.30% 0.28%
Performance Inception Date     May 27, 2014
After Taxes on Distributions and Sales      
Prospectus [Line Items]      
Average Annual Return, Percent [1] 4.03% 1.34% 0.54%
Performance Inception Date [1]     May 27, 2014
Bloomberg U.S. Aggregate Bond Index (reflects no deduction for expenses, fees, or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 5.53% 1.10% 1.51%
ICE BofA U.S. 3-Month Treasury Bill Total Return Index (reflects no deduction for expenses, fees, or taxes)      
Prospectus [Line Items]      
Average Annual Return, Percent 5.01% 1.88% 1.30%
Return Before Taxes      
Prospectus [Line Items]      
Average Annual Return, Percent 6.85% 2.30% 1.28%
Performance Inception Date     May 27, 2014
[1] If the Fund incurs a loss, which generates a tax benefit, the Return After Taxes on Distributions and Sale of Fund Shares may exceed the Fund’s other return figures.