Shareholder Report, Average Annual Return (Details)
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12 Months Ended |
60 Months Ended |
120 Months Ended |
Aug. 31, 2026 |
Aug. 31, 2026 |
Aug. 31, 2026 |
| C000006510 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C with CDSC (1% for 12 months)
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| Average Annual Return, Percent |
[1] |
(3.05%)
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0.52%
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10.01%
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| C000006509 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B with CDSC (declining over six years from 4% to 0%)
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| Average Annual Return, Percent |
[2] |
(5.39%)
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0.24%
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10.02%
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| C000006504 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A with initial sales charge (5.75%)
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| Average Annual Return, Percent |
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(7.16%)
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0.09%
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10.19%
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| C000107819 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C with CDSC (1% for 12 months)
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| Average Annual Return, Percent |
[3] |
4.79%
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(0.44%)
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7.41%
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| C000107818 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B with CDSC (declining over six years from 4% to 0%)
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| Average Annual Return, Percent |
[4] |
1.79%
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(0.81%)
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7.41%
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| C000107817 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A with initial sales charge (5.75%)
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| Average Annual Return, Percent |
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0.45%
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(0.87%)
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7.57%
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| C000159993 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A with initial sales charge (5.75%)
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| Average Annual Return, Percent |
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34.62%
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9.20%
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9.56%
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| C000159994 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B with CDSC (declining over six years from 4% to 0%)
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| Average Annual Return, Percent |
[5] |
37.82%
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9.40%
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9.39%
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| C000159995 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C with CDSC (1% for 12 months)
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| Average Annual Return, Percent |
[6] |
40.77%
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9.67%
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9.38%
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| C000160013 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C with CDSC (1% for 12 months)
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| Average Annual Return, Percent |
[7] |
30.61%
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12.09%
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10.60%
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| C000160012 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B with CDSC (declining over six years from 4% to 0%)
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| Average Annual Return, Percent |
[8] |
27.57%
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11.83%
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10.59%
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| C000160011 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A with initial sales charge (5.75%)
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| Average Annual Return, Percent |
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24.95%
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11.62%
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10.79%
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| Without Sales Load [Member] | C000124428 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R6 without sales charge
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| Average Annual Return, Percent |
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(1.12%)
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1.66%
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11.25%
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| Without Sales Load [Member] | C000006505 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R4 without sales charge
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| Average Annual Return, Percent |
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(1.23%)
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1.54%
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11.12%
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| Without Sales Load [Member] | C000006516 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R3 without sales charge
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| Average Annual Return, Percent |
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(1.51%)
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1.28%
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10.85%
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| Without Sales Load [Member] | C000006515 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R2 without sales charge
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| Average Annual Return, Percent |
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(1.73%)
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1.03%
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10.57%
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| Without Sales Load [Member] | C000006513 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R1 without sales charge
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| Average Annual Return, Percent |
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(2.23%)
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0.53%
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10.02%
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| Without Sales Load [Member] | C000006511 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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I without sales charge
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| Average Annual Return, Percent |
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(1.23%)
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1.54%
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11.12%
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| Without Sales Load [Member] | C000006510 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C without sales charge
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| Average Annual Return, Percent |
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(2.26%)
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0.52%
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10.01%
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| Without Sales Load [Member] | C000006509 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B without sales charge
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| Average Annual Return, Percent |
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(2.22%)
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0.52%
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10.02%
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| Without Sales Load [Member] | C000006504 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A without sales charge
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| Average Annual Return, Percent |
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(1.50%)
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1.28%
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10.85%
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| Without Sales Load [Member] | C000124429 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R6 without sales charge
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| Average Annual Return, Percent |
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6.96%
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0.65%
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8.59%
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| Without Sales Load [Member] | C000107824 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R4 without sales charge
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| Average Annual Return, Percent |
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6.89%
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0.57%
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8.49%
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| Without Sales Load [Member] | C000107823 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R3 without sales charge
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| Average Annual Return, Percent |
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6.60%
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0.31%
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8.21%
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| Without Sales Load [Member] | C000107822 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R2 without sales charge
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| Average Annual Return, Percent |
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6.34%
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0.06%
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7.95%
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| Without Sales Load [Member] | C000107821 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R1 without sales charge
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| Average Annual Return, Percent |
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5.84%
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(0.43%)
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7.40%
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| Without Sales Load [Member] | C000107820 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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I without sales charge
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| Average Annual Return, Percent |
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6.86%
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0.55%
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8.48%
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| Without Sales Load [Member] | C000107819 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C without sales charge
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| Average Annual Return, Percent |
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5.79%
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(0.44%)
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7.41%
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| Without Sales Load [Member] | C000107818 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B without sales charge
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| Average Annual Return, Percent |
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5.79%
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(0.44%)
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7.41%
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| Without Sales Load [Member] | C000107817 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A without sales charge
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| Average Annual Return, Percent |
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6.58%
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0.31%
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8.21%
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| Without Sales Load [Member] | C000159993 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A without sales charge
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| Average Annual Return, Percent |
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42.83%
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10.50%
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10.21%
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| Without Sales Load [Member] | C000159994 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B without sales charge
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| Average Annual Return, Percent |
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41.82%
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9.68%
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9.39%
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| Without Sales Load [Member] | C000159995 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C without sales charge
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| Average Annual Return, Percent |
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41.77%
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9.67%
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9.38%
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| Without Sales Load [Member] | C000159996 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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I without sales charge
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| Average Annual Return, Percent |
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43.23%
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10.77%
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10.49%
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| Without Sales Load [Member] | C000159997 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R1 without sales charge
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| Average Annual Return, Percent |
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42.90%
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10.50%
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9.85%
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| Without Sales Load [Member] | C000159998 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R2 without sales charge
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| Average Annual Return, Percent |
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42.47%
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10.21%
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9.94%
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| Without Sales Load [Member] | C000159999 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R3 without sales charge
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| Average Annual Return, Percent |
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42.85%
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10.50%
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10.22%
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| Without Sales Load [Member] | C000160000 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R4 without sales charge
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| Average Annual Return, Percent |
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43.25%
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10.77%
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10.50%
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| Without Sales Load [Member] | C000160001 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R6 without sales charge
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| Average Annual Return, Percent |
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43.33%
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10.87%
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10.58%
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| Without Sales Load [Member] | C000160019 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R6 without sales charge
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| Average Annual Return, Percent |
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33.07%
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13.30%
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11.81%
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| Without Sales Load [Member] | C000160018 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R4 without sales charge
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| Average Annual Return, Percent |
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32.93%
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13.21%
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11.71%
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| Without Sales Load [Member] | C000160017 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R3 without sales charge
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| Average Annual Return, Percent |
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32.63%
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12.92%
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11.42%
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| Without Sales Load [Member] | C000160016 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R2 without sales charge
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| Average Annual Return, Percent |
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32.25%
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12.65%
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11.15%
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| Without Sales Load [Member] | C000160015 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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R1 without sales charge
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| Average Annual Return, Percent |
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31.68%
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12.08%
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10.60%
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| Without Sales Load [Member] | C000160014 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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I without sales charge
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| Average Annual Return, Percent |
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32.97%
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13.22%
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11.71%
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| Without Sales Load [Member] | C000160013 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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C without sales charge
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| Average Annual Return, Percent |
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31.61%
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12.09%
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10.60%
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| Without Sales Load [Member] | C000160012 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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B without sales charge
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| Average Annual Return, Percent |
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31.57%
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12.08%
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10.59%
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| Without Sales Load [Member] | C000160011 [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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A without sales charge
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| Average Annual Return, Percent |
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32.58%
|
12.95%
|
11.45%
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| Russell 3000 Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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Russell 3000® Index
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| Average Annual Return, Percent |
[9],[10] |
20.10%
|
11.80%
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14.84%
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| MSCI All Country World Index net div [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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MSCI All Country World Index (net div)
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| Average Annual Return, Percent |
[11],[12] |
22.35%
|
10.88%
|
12.58%
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| MSCI Emerging Markets Index net div [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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MSCI Emerging Markets Index (net div)
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| Average Annual Return, Percent |
[13] |
39.25%
|
8.18%
|
9.29%
|
| MSCI All Country World ex US Index net div [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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MSCI All Country World (ex-US) Index (net div)
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| Average Annual Return, Percent |
[14],[15] |
27.35%
|
9.37%
|
9.64%
|
| Russell Midcap Growth Index [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
|
Russell Midcap® Growth Index
|
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| Average Annual Return, Percent |
[9],[10] |
(1.16%)
|
4.27%
|
12.06%
|
| MSCI All Country World Small Mid Cap Index net div [Member] |
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| Average Annual Return [Line Items] |
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| Line Graph and Table Measure Name |
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MSCI All Country World Small Mid Cap Index (net div)
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| Average Annual Return, Percent |
[11],[12] |
19.70%
|
7.07%
|
9.99%
|
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