Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 103 Months Ended |
|---|---|---|---|
May 31, 2025 |
May 31, 2025 |
May 31, 2025 |
|
| Without Sales Load [Member] | C000174964 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.84% | (0.07%) | 1.83% |
| Without Sales Load [Member] | C000174965 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.54% | (0.36%) | 1.53% |
| Without Sales Load [Member] | C000174966 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.98% | 0.04% | 1.95% |
| Bloomberg U.S. Aggregate Bond Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.46% | (0.90%) | 1.45% |
| Bloomberg U.S. Aggregate Bond Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.46% | (0.90%) | 1.45% |
| Bloomberg U.S. Aggregate Bond Index | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 5.46% | (0.90%) | 1.45% |