v3.26.3
Shareholder Report, Average Annual Return (Details)
 12 Months Ended 60 Months Ended 120 Months Ended
Aug. 31, 2026
Aug. 31, 2026
Aug. 31, 2026
C000074271 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name C with CDSC (1% for 12 months)    
Average Annual Return, Percent [1] 5.76% (2.22%) 3.38%
C000074270 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name B with CDSC (declining over six years from 4% to 0%)    
Average Annual Return, Percent [2] 2.70% (2.58%) 3.38%
C000074269 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name A with initial sales charge (5.75%)    
Average Annual Return, Percent 1.30% (2.65%) 3.54%
Without Sales Load [Member] | C000117929 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name R6 without sales charge    
Average Annual Return, Percent 7.83% (1.16%) 4.51%
Without Sales Load [Member] | C000074276 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name R4 without sales charge    
Average Annual Return, Percent 7.78% (1.24%) 4.41%
Without Sales Load [Member] | C000074275 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name R3 without sales charge    
Average Annual Return, Percent 7.49% (1.48%) 4.16%
Without Sales Load [Member] | C000074274 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name R2 without sales charge    
Average Annual Return, Percent 7.26% (1.74%) 3.90%
Without Sales Load [Member] | C000074273 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name R1 without sales charge    
Average Annual Return, Percent 6.76% (2.21%) 3.38%
Without Sales Load [Member] | C000074272 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name I without sales charge    
Average Annual Return, Percent 7.75% (1.24%) 4.42%
Without Sales Load [Member] | C000074271 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name C without sales charge    
Average Annual Return, Percent 6.76% (2.22%) 3.38%
Without Sales Load [Member] | C000074270 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name B without sales charge    
Average Annual Return, Percent 6.70% (2.22%) 3.38%
Without Sales Load [Member] | C000074269 [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name A without sales charge    
Average Annual Return, Percent 7.48% (1.49%) 4.16%
MSCI All Country World Index net div [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name MSCI All Country World Index (net div)    
Average Annual Return, Percent [3],[4] 22.35% 10.88% 12.58%
FTSE EPRA Nareit Developed Real Estate Index net div [Member]      
Average Annual Return [Line Items]      
Line Graph and Table Measure Name FTSE EPRA Nareit Developed Real Estate Index (net div)    
Average Annual Return, Percent [3],[4] 9.28% 0.57% 3.04%
[1] Assuming redemption at the end of the applicable period.
[2]
Assuming redemption at the end of the applicable period.
[3]
Source: FactSet Research Systems Inc.
[4] Source: FactSet Research Systems Inc.