S000069167 [Member] Expense Example - William Blair Emerging Markets Debt Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class R6 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 66 |
| Expense Example, with Redemption, 3 Years | 299 |
| Expense Example, with Redemption, 5 Years | 549 |
| Expense Example, with Redemption, 10 Years | 1,268 |
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 72 |
| Expense Example, with Redemption, 3 Years | 327 |
| Expense Example, with Redemption, 5 Years | 603 |
| Expense Example, with Redemption, 10 Years | $ 1,389 |