v3.26.1
Shareholder Report, Holdings (Details)
May 31, 2026
C000102727 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000102727 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000102727 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000102727 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000102727 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000102727 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000102727 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000102727 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000102727 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000102727 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000102727 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000102727 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000102727 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000102727 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000102727 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000102727 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000102727 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000102727 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000102727 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000102727 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000102727 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000102727 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006431 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006431 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006431 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006431 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006431 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006431 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006431 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006431 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006431 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006431 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006431 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006431 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006431 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006431 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006431 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006431 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006431 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006431 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006431 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006431 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006431 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006431 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006442 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006442 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006442 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006442 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006442 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006442 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006442 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006442 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006442 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006442 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006442 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006442 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006442 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006442 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006442 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006442 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006442 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006442 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006442 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006442 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006442 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006442 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006441 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006441 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006441 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006441 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006441 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006441 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006441 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006441 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006441 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006441 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006441 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006441 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006441 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006441 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006441 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006441 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006441 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006441 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006441 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006441 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006441 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006441 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006439 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006439 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006439 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006439 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006439 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006439 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006439 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006439 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006439 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006439 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006439 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006439 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006439 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006439 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006439 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006439 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006439 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006439 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006439 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006439 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006439 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006439 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006437 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006437 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006437 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006437 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006437 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006437 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006437 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006437 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006437 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006437 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006437 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006437 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006437 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006437 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006437 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006437 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006437 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006437 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006437 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006437 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006437 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006437 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006436 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006436 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006436 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006436 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006436 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006436 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006436 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006436 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006436 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006436 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006436 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006436 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006436 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006436 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006436 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006436 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006436 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006436 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006436 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006436 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006436 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006436 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006435 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006435 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006435 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006435 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006435 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006435 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006435 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006435 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006435 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006435 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006435 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006435 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006435 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006435 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006435 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006435 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006435 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006435 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006435 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006435 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006435 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006435 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%
C000006430 [Member] | Seagate Technology Holdings PLC [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.80%
C000006430 [Member] | Meta Platforms Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006430 [Member] | GE Vernova Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000006430 [Member] | Mastercard Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000006430 [Member] | Broadcom Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000006430 [Member] | Amazon com Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000006430 [Member] | Microsoft Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000006430 [Member] | Alphabet Inc A [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.30%
C000006430 [Member] | Apple Inc [Member]  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000006430 [Member] | NVIDIA Corp [Member]  
Holdings [Line Items]  
Percent of Total Investments 15.30%
C000006430 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000006430 [Member] | Information Technology Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 50.10%
C000006430 [Member] | Industrial Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000006430 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000006430 [Member] | Consumer Discretionary Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000006430 [Member] | Communications Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 13.50%
C000006430 [Member] | Real Estate Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000006430 [Member] | Healthcare Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000006430 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000006430 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000006430 [Member] | Equity [Member]  
Holdings [Line Items]  
Percent of Total Investments 99.00%
C000006430 [Member] | Money Market Funds [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.00%