Shareholder Report, Line Graph (Details) - USD ($) |
6 Months Ended | 12 Months Ended | 24 Months Ended | 36 Months Ended | 48 Months Ended | 60 Months Ended | 72 Months Ended | 84 Months Ended | 96 Months Ended | 108 Months Ended | 120 Months Ended | |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Sep. 30, 2016 |
Mar. 31, 2026 |
Sep. 30, 2017 |
Sep. 30, 2018 |
Sep. 30, 2019 |
Sep. 30, 2020 |
Sep. 30, 2021 |
Sep. 30, 2022 |
Sep. 30, 2023 |
Sep. 30, 2024 |
Sep. 30, 2025 |
Sep. 30, 2026 |
|
| The Cook & Bynum Fund [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | The Cook & Bynum Fund | |||||||||||
| Accumulated Value | $ 10,000 | $ 10,474 | $ 11,185 | $ 10,565 | $ 8,061 | $ 10,065 | $ 10,906 | $ 12,011 | $ 13,490 | $ 13,791 | $ 14,954 | |
| MSCI ACWI Net Total Return Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI Net Total Return Index | |||||||||||
| Accumulated Value | $ 10,000 | $ 11,773 | $ 13,521 | $ 13,872 | $ 12,311 | $ 19,033 | $ 20,418 | $ 18,899 | $ 23,287 | $ 24,952 | $ 29,945 |