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 | ||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Aug. 31, 2016 |
Aug. 31, 2026 |
Aug. 31, 2017 |
Aug. 31, 2018 |
Aug. 31, 2019 |
Aug. 31, 2020 |
Aug. 31, 2021 |
Aug. 31, 2022 |
Aug. 31, 2023 |
Aug. 31, 2024 |
Aug. 31, 2025 |
Aug. 31, 2026 |
|
| C000074271 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | C with CDSC (1% for 12 months) | |||||||||||
| Accumulated Value | $ 10,000 | $ 10,244 | $ 10,908 | $ 12,156 | $ 11,814 | $ 15,605 | $ 12,766 | $ 12,070 | $ 13,750 | $ 13,066 | $ 13,949 | |
| C000074270 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | B with CDSC (declining over six years from 4% to 0%) | |||||||||||
| Accumulated Value | 10,000 | 10,246 | 10,905 | 12,156 | 11,816 | 15,600 | 12,763 | 12,069 | 13,749 | 13,069 | 13,945 | |
| C000074269 [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | A with initial sales charge (5.75%) | |||||||||||
| Accumulated Value | 9,425 | 9,738 | 10,439 | 11,716 | 11,476 | 15,266 | 12,583 | 11,984 | 13,756 | 13,179 | 14,165 | |
| MSCI All Country World Index net div [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | MSCI All Country World Index (net div) | |||||||||||
| Accumulated Value | 10,000 | 11,711 | 13,048 | 13,011 | 15,161 | 19,504 | 16,406 | 18,694 | 23,076 | 26,721 | 32,693 | |
| FTSE EPRA Nareit Developed Real Estate Index net div [Member] | ||||||||||||
| Account Value [Line Items] | ||||||||||||
| Line Graph and Table Measure Name | FTSE EPRA Nareit Developed Real Estate Index (net div) | |||||||||||
| Accumulated Value | $ 10,000 | $ 9,990 | $ 10,538 | $ 11,394 | $ 9,836 | $ 13,115 | $ 10,895 | $ 10,329 | $ 12,132 | $ 12,348 | $ 13,495 | |