Average Annual Total Returns |
12 Months Ended | 60 Months Ended | 120 Months Ended | |
|---|---|---|---|---|
Feb. 27, 2026 |
Dec. 31, 2025 |
Dec. 31, 2025 |
Dec. 31, 2025 |
|
| S&P 500 Total Return Index (reflects no deduction for fees, expenses or taxes) | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 17.88% | 14.42% | 14.82% | |
| The Chesapeake Growth Fund | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Label [Optional Text] | Return Before Taxes | |||
| Average Annual Return, Percent | 16.22% | 5.78% | 10.14% | |
| The Chesapeake Growth Fund | After Taxes on Distributions | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 14.24% | 5.08% | 9.78% | |
| The Chesapeake Growth Fund | After Taxes on Distributions and Sales | ||||
| Prospectus [Line Items] | ||||
| Average Annual Return, Percent | 11.00% | 4.48% | 8.38% |