Shareholder Report, Line Graph (Details) - USD ($) |
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 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
May 31, 2015 |
May 31, 2025 |
May 31, 2016 |
May 31, 2017 |
May 31, 2018 |
May 31, 2019 |
May 31, 2020 |
May 31, 2021 |
May 31, 2022 |
May 31, 2023 |
May 31, 2024 |
May 31, 2025 |
|
| C000005984 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Institutional Shares | |||||||||||
| Accumulated Value | $ 10,000 | $ 8,968 | $ 10,594 | $ 11,297 | $ 10,552 | $ 11,088 | $ 17,313 | $ 13,474 | $ 13,402 | $ 15,467 | $ 15,995 | |
| C000005981 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Investor A Shares (with sales charge) | |||||||||||
| C000005983 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Investor C Shares (with sales charge) | |||||||||||
| C000198221 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class K Shares | |||||||||||
| Accumulated Value | 10,000 | 8,968 | 10,594 | 11,304 | 10,563 | 11,105 | 17,349 | 13,514 | 13,442 | 15,528 | 16,059 | |
| C000101856 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | Class R Shares | |||||||||||
| Accumulated Value | 10,000 | 8,904 | 10,449 | 11,083 | 10,292 | 10,761 | 16,720 | 12,949 | 12,815 | 14,715 | 15,139 | |
| MSCI ACWI ex USA Index [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | MSCI ACWI ex USA Index | |||||||||||
| Accumulated Value | $ 10,000 | $ 8,861 | $ 10,477 | $ 11,491 | $ 10,771 | $ 10,401 | $ 14,851 | $ 13,008 | $ 12,826 | $ 14,973 | $ 17,032 | |