S000075390 [Member] Expense Example - William Blair Emerging Markets ex China Growth Fund |
Dec. 31, 2025
USD ($)
|
|---|---|
| Class I | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | $ 101 |
| Expense Example, with Redemption, 3 Years | 500 |
| Expense Example, with Redemption, 5 Years | 925 |
| Expense Example, with Redemption, 10 Years | 2,109 |
| Class R6 | |
| Prospectus [Line Items] | |
| Expense Example, with Redemption, 1 Year | 96 |
| Expense Example, with Redemption, 3 Years | 474 |
| Expense Example, with Redemption, 5 Years | 877 |
| Expense Example, with Redemption, 10 Years | $ 2,005 |