Shareholder Report, Holdings (Details)
|
Apr. 30, 2026 |
| C000006707 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.10%
|
| C000006707 [Member] | Fitch, CCC Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.60%
|
| C000006707 [Member] | Fitch, BB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.40%
|
| C000006707 [Member] | Fitch, B Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006707 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006707 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
14.30%
|
| C000006707 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
27.50%
|
| C000006707 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006707 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.70%
|
| C000006707 [Member] | Moody's, C Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006707 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006707 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006707 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
25.50%
|
| C000006707 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.20%
|
| C000006707 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006708 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.10%
|
| C000006708 [Member] | Fitch, CCC Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.60%
|
| C000006708 [Member] | Fitch, BB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.40%
|
| C000006708 [Member] | Fitch, B Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006708 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006708 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
14.30%
|
| C000006708 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
27.50%
|
| C000006708 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006708 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.70%
|
| C000006708 [Member] | Moody's, C Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006708 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006708 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006708 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
25.50%
|
| C000006708 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.20%
|
| C000006708 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006709 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.10%
|
| C000006709 [Member] | Fitch, CCC Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.60%
|
| C000006709 [Member] | Fitch, BB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.40%
|
| C000006709 [Member] | Fitch, B Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006709 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006709 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
14.30%
|
| C000006709 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
27.50%
|
| C000006709 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006709 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.70%
|
| C000006709 [Member] | Moody's, C Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006709 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006709 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006709 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
25.50%
|
| C000006709 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.20%
|
| C000006709 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006710 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.10%
|
| C000006710 [Member] | Fitch, CCC Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.60%
|
| C000006710 [Member] | Fitch, BB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.40%
|
| C000006710 [Member] | Fitch, B Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006710 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000006710 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
14.30%
|
| C000006710 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
27.50%
|
| C000006710 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000006710 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.70%
|
| C000006710 [Member] | Moody's, C Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000006710 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006710 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000006710 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
25.50%
|
| C000006710 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.20%
|
| C000006710 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000200511 [Member] | Fitch, D Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.10%
|
| C000200511 [Member] | Fitch, CCC Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.60%
|
| C000200511 [Member] | Fitch, BB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.40%
|
| C000200511 [Member] | Fitch, B Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000200511 [Member] | Fitch, AA Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.70%
|
| C000200511 [Member] | Fitch, A Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
14.30%
|
| C000200511 [Member] | Fitch, BBB Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
27.50%
|
| C000200511 [Member] | Not Rated [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.30%
|
| C000200511 [Member] | Moody's, Aaa Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
11.70%
|
| C000200511 [Member] | Moody's, C Rating [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000200511 [Member] | Money Market Funds Quality [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000200511 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.80%
|
| C000200511 [Member] | US Government Debt Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
25.50%
|
| C000200511 [Member] | Fixed Income Securities [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.20%
|
| C000200511 [Member] | Federal Agencies [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
0.00%
|
| C000126358 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000126358 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000126358 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000126358 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000126358 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000126358 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000126358 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000126358 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000126358 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000126358 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000126358 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000126358 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000126358 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000126358 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000126358 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000126358 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000126358 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000126358 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000126358 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000126358 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000126358 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000126358 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006698 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006698 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006698 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006698 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006698 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006698 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006698 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006698 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006698 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006698 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006698 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006698 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006698 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006698 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006698 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006698 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006698 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006698 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006698 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006698 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006698 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006698 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006705 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006705 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006705 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006705 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006705 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006705 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006705 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006705 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006705 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006705 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006705 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006705 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006705 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006705 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006705 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006705 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006705 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006705 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006705 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006705 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006705 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006705 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006706 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006706 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006706 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006706 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006706 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006706 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006706 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006706 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006706 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006706 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006706 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006706 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006706 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006706 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006706 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006706 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006706 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006706 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006706 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006706 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006706 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006706 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006699 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006699 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006699 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006699 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006699 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006699 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006699 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006699 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006699 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006699 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006699 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006699 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006699 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006699 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006699 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006699 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006699 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006699 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006699 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006699 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006699 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006699 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006700 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006700 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006700 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006700 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006700 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006700 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006700 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006700 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006700 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006700 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006700 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006700 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006700 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006700 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006700 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006700 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006700 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006700 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006700 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006700 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006700 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006700 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006701 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006701 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006701 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006701 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006701 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006701 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006701 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006701 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006701 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006701 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006701 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006701 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006701 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006701 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006701 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006701 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006701 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006701 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006701 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006701 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006701 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006701 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006703 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006703 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006703 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006703 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006703 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006703 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006703 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006703 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006703 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006703 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006703 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006703 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006703 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006703 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006703 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006703 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006703 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006703 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006703 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006703 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006703 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006703 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|
| C000006697 [Member] | NVIDIA Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006697 [Member] | Microsoft Corp [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.90%
|
| C000006697 [Member] | Visa Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
3.20%
|
| C000006697 [Member] | Amazon com Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.70%
|
| C000006697 [Member] | Taiwan Semiconductor Manufacturing Co Ltd ADR [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006697 [Member] | Alphabet Inc A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.60%
|
| C000006697 [Member] | Apple Inc [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.60%
|
| C000006697 [Member] | Tencent Holdings Ltd [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.50%
|
| C000006697 [Member] | Schneider Electric SE [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006697 [Member] | L Oreal S A [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.30%
|
| C000006697 [Member] | Other Countries [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006697 [Member] | INDIA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006697 [Member] | JAPAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.10%
|
| C000006697 [Member] | SWITZERLAND |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.10%
|
| C000006697 [Member] | TAIWAN |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
6.60%
|
| C000006697 [Member] | UNITED KINGDOM |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.20%
|
| C000006697 [Member] | UNITED STATES |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
68.60%
|
| C000006697 [Member] | CHINA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
4.50%
|
| C000006697 [Member] | FRANCE |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
5.90%
|
| C000006697 [Member] | CANADA |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
2.00%
|
| C000006697 [Member] | Money Market Funds [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
1.40%
|
| C000006697 [Member] | Equity [Member] |
|
| Holdings [Line Items] |
|
| Percent of Total Investments |
98.60%
|