v3.26.1
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 75 Months Ended 114 Months Ended 120 Months Ended
May 31, 2026
May 31, 2026
May 31, 2026
May 31, 2026
May 31, 2026
Without Sales Load [Member] | C000103068          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.70% 5.98%     4.96%
Without Sales Load [Member] | C000103069          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.50% 5.77%     4.77%
Without Sales Load [Member] | C000177200          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.73% 6.12%   5.04%  
Without Sales Load [Member] | C000219333          
Average Annual Return [Line Items]          
Average Annual Return, Percent 6.49% 6.77% 8.13%    
Bloomberg U.S. Aggregate Bond Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.13% 0.17%     1.70%
Bloomberg U.S. Aggregate Bond Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.13% 0.17%     1.70%
Bloomberg U.S. Aggregate Bond Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.13% 0.17%   1.86%  
Bloomberg U.S. Aggregate Bond Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.13% 0.17% 0.42%    
Morningstar LSTA Performing Loan Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.14% 6.21%     5.66%
Morningstar LSTA Performing Loan Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.14% 6.21%     5.66%
Morningstar LSTA Performing Loan Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.14% 6.21%   5.51%  
Morningstar LSTA Performing Loan Index          
Average Annual Return [Line Items]          
Average Annual Return, Percent 5.14% 6.21% 7.95%