Shareholder Report, Holdings (Details) - C000111140 |
Aug. 31, 2025 |
|---|---|
| Federal National Mortgage Assn. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 48.90% |
| Federal Home Loan Mortgage | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 26.80% |
| Government National Mortgage Assn. | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 25.40% |
| UMBS | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 3.20% |
| U.S. Government & Agency Mortgage-Backed Securities | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | 104.30% |
| Other Holdings Grouping | |
| Holdings [Line Items] | |
| Percent of Net Asset Value | (4.30%) |