Expense Example - William Blair Global Leaders Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class N | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 117 |
| Expense Example, with Redemption, 3 Years | 541 |
| Expense Example, with Redemption, 5 Years | 991 |
| Expense Example, with Redemption, 10 Years | 2,239 |
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 92 |
| Expense Example, with Redemption, 3 Years | 462 |
| Expense Example, with Redemption, 5 Years | 856 |
| Expense Example, with Redemption, 10 Years | 1,962 |
| Class R6 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 87 |
| Expense Example, with Redemption, 3 Years | 438 |
| Expense Example, with Redemption, 5 Years | 813 |
| Expense Example, with Redemption, 10 Years | $ 1,867 |