Shareholder Report, Average Annual Return (Details) |
12 Months Ended | 60 Months Ended | 120 Months Ended |
|---|---|---|---|
Jul. 31, 2026 |
Jul. 31, 2026 |
Jul. 31, 2026 |
|
| C000035521 | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Changing Parameters Fund | ||
| Without Sales Load [Member] | C000035521 | |||
| Average Annual Return [Line Items] | |||
| Average Annual Return, Percent | 3.63% | 3.74% | 4.82% |
| Bloomberg U.S. Aggregate Bond Index | |||
| Average Annual Return [Line Items] | |||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index | ||
| Average Annual Return, Percent | 2.71% | (0.40%) | 1.35% |