v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2026
Jul. 31, 2026
Jul. 31, 2026
Without Sales Load [Member] | C000129315      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.94% 3.57% 2.59%
Without Sales Load [Member] | C000198747      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.63% 3.32% 2.35%
Without Sales Load [Member] | C000119004      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.14% 3.63% 2.66%
Bloomberg U.S. Aggregate Bond Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.71% (0.40%) 1.35%
Bloomberg U.S. Aggregate Bond Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.71% (0.40%) 1.35%
Bloomberg U.S. Aggregate Bond Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 2.71% (0.40%) 1.35%
ICE BofA 6-Month U.S. Treasury Bill Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name ICE BofA 6-Month U.S. Treasury Bill Index    
Average Annual Return, Percent 3.89% 3.61% 2.47%
ICE BofA 6-Month U.S. Treasury Bill Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name ICE BofA 6-Month U.S. Treasury Bill Index    
Average Annual Return, Percent 3.89% 3.61% 2.47%
ICE BofA 6-Month U.S. Treasury Bill Index      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name ICE BofA 6-Month U.S. Treasury Bill Index    
Average Annual Return, Percent 3.89% 3.61% 2.47%