v3.25.2
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Jul. 31, 2025
Jul. 31, 2025
Jul. 31, 2025
Without Sales Load [Member] | C000129315      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.77% 2.81% 2.29%
Without Sales Load [Member] | C000198747      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.65% 2.60% 2.05%
Without Sales Load [Member] | C000119004      
Average Annual Return [Line Items]      
Average Annual Return, Percent 4.76% 2.86% 2.35%
Bloomberg U.S. Aggregate Bond Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.38% (1.07%) 1.66%
Bloomberg U.S. Aggregate Bond Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.38% (1.07%) 1.66%
Bloomberg U.S. Aggregate Bond Index      
Average Annual Return [Line Items]      
Average Annual Return, Percent 3.38% (1.07%) 1.66%
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 4.60% 2.85% 2.14%
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 4.60% 2.85% 2.14%
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 4.60% 2.85% 2.14%