Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
65 Months Ended |
110 Months Ended |
120 Months Ended |
Apr. 30, 2026 |
Apr. 30, 2026 |
Apr. 30, 2026 |
Apr. 30, 2026 |
Apr. 30, 2026 |
| C000101627 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000112445 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000112461 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000176891 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000053010 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000088892 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000053007 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000053008 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000221911 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000221910 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000119796 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| C000053009 |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
Fund
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| Without Sales Load [Member] | C000101627 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
10.07%
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(0.90%)
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2.02%
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| Without Sales Load [Member] | C000112445 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
10.64%
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3.11%
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4.68%
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| Without Sales Load [Member] | C000112461 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
10.00%
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3.53%
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6.33%
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| Without Sales Load [Member] | C000176891 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.74%
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0.87%
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2.26%
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| Without Sales Load [Member] | C000053010 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.92%
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(0.05%)
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1.99%
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| Without Sales Load [Member] | C000088892 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.54%
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4.41%
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3.44%
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| Without Sales Load [Member] | C000053007 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.56%
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0.45%
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1.91%
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| Without Sales Load [Member] | C000053008 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
6.37%
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(0.93%)
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1.59%
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| Without Sales Load [Member] | C000221911 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.11%
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1.23%
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1.08%
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| Without Sales Load [Member] | C000221910 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.83%
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1.10%
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0.84%
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| Without Sales Load [Member] | C000119796 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
5.29%
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1.02%
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2.03%
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| Without Sales Load [Member] | C000053009 |
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| Average Annual Return [Line Items] |
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| Average Annual Return, Percent |
4.06%
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1.14%
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1.47%
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| ICE US Broad Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Broad Municipal Index
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| Average Annual Return, Percent |
5.95%
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1.00%
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2.19%
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| ICE BofA Global Broad Market Plus Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA Global Broad Market Plus Index
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| Average Annual Return, Percent |
2.27%
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(1.67%)
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0.42%
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| ICE BofA US Broad Market Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA US Broad Market Index
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| Average Annual Return, Percent |
4.08%
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0.18%
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1.68%
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| ICE BofA US Broad Market Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA US Broad Market Index
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| Average Annual Return, Percent |
4.08%
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0.18%
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1.90%
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| ICE US Broad Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Broad Municipal Index
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| Average Annual Return, Percent |
5.95%
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1.00%
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2.19%
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| ICE BofA US Broad Market Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA US Broad Market Index
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| Average Annual Return, Percent |
4.08%
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0.18%
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1.68%
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| ICE US Broad Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Broad Municipal Index
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| Average Annual Return, Percent |
5.95%
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1.00%
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2.19%
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| ICE US Broad Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Broad Municipal Index
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| Average Annual Return, Percent |
5.95%
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1.00%
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2.19%
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| ICE BofA US Broad Market Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA US Broad Market Index
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| Average Annual Return, Percent |
4.08%
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0.18%
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(0.25%)
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| ICE BofA US Broad Market Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA US Broad Market Index
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| Average Annual Return, Percent |
4.08%
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0.18%
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(0.25%)
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| ICE US Broad Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Broad Municipal Index
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| Average Annual Return, Percent |
5.95%
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1.00%
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2.19%
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| ICE US Broad Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Broad Municipal Index
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| Average Annual Return, Percent |
5.95%
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1.00%
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2.19%
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| S-Network Municipal Bond Closed-End Fund Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S-Network Municipal Bond Closed-End Fund Index
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| Average Annual Return, Percent |
10.47%
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(0.51%)
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2.39%
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| ICE BofA Diversified High Yield US Emerging Markets Corp Plus Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE BofA Diversified High Yield US Emerging Markets Corp Plus Index
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| Average Annual Return, Percent |
10.95%
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3.02%
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4.87%
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| ICE US Fallen Angel High Yield 10% Constrained Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE US Fallen Angel High Yield 10% Constrained Index
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| Average Annual Return, Percent |
9.97%
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3.71%
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6.73%
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| S&P Green Bond U.S. Dollar Select Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
S&P Green Bond U.S. Dollar Select Index
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| Average Annual Return, Percent |
4.88%
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1.02%
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2.62%
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| ICE Broad High Yield Crossover Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE Broad High Yield Crossover Municipal Index
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| Average Annual Return, Percent |
6.15%
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1.72%
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3.89%
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| MVIS® US Investment Grade Floating Rate Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> US Investment Grade Floating Rate Index
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| Average Annual Return, Percent |
5.64%
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4.42%
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3.60%
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| ICE Intermediate AMT-Free Broad National Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE Intermediate AMT-Free Broad National Municipal Index
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| Average Annual Return, Percent |
6.69%
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0.70%
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2.30%
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| ICE Long AMT-Free Broad National Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE Long AMT-Free Broad National Municipal Index
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| Average Annual Return, Percent |
6.58%
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(0.26%)
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2.25%
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| MVIS® Moody's Analytics US BBB Corporate Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Moody's Analytics US BBB Corporate Bond Index
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| Average Annual Return, Percent |
5.44%
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1.36%
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1.19%
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| MVIS® Moody's Analytics US Investment Grade Corporate Bond Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
MVIS<sup style="inset: 1.5px 0px 4px; box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; text-align-last: auto; white-space-collapse: preserve-breaks;">®</sup> Moody's Analytics US Investment Grade Corporate Bond Index
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| Average Annual Return, Percent |
5.03%
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1.19%
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0.89%
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| ICE 1-12 Year Broad High Yield Crossover Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE 1-12 Year Broad High Yield Crossover Municipal Index
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| Average Annual Return, Percent |
4.98%
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2.42%
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3.34%
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| ICE Short AMT-Free Broad National Municipal Index |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
ICE Short AMT-Free Broad National Municipal Index
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| Average Annual Return, Percent |
4.02%
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1.16%
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1.67%
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