Shareholder Report, Holdings (Details)	Nov. 30, 2024
C000006373 [Member] \| Steven Madden [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.32%
C000006373 [Member] \| Brinker International [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.73%
C000006373 [Member] \| Applied Industrial Technologies [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.69%
C000006373 [Member] \| Prestige Consumer Healthcare [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000006373 [Member] \| Summit Materials Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.47%
C000006373 [Member] \| Federal Signal [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006373 [Member] \| Q2 Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006373 [Member] \| Semtech [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006373 [Member] \| Boise Cascade [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006373 [Member] \| ExlService Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.35%
C000006373 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.35%
C000006373 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.97%
C000006373 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.59%
C000006373 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.51%
C000006373 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.08%
C000006373 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.34%
C000006373 [Member] \| Capital Goods [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.93%
C000006373 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.22%
C000006373 [Member] \| Basic Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.43%
C000006373 [Member] \| Business Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.69%
C000006374 [Member] \| Steven Madden [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.32%
C000006374 [Member] \| Brinker International [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.73%
C000006374 [Member] \| Applied Industrial Technologies [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.69%
C000006374 [Member] \| Prestige Consumer Healthcare [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000006374 [Member] \| Summit Materials Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.47%
C000006374 [Member] \| Federal Signal [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006374 [Member] \| Q2 Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006374 [Member] \| Semtech [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006374 [Member] \| Boise Cascade [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006374 [Member] \| ExlService Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.35%
C000006374 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.35%
C000006374 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.97%
C000006374 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.59%
C000006374 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.51%
C000006374 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.08%
C000006374 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.34%
C000006374 [Member] \| Capital Goods [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.93%
C000006374 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.22%
C000006374 [Member] \| Basic Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.43%
C000006374 [Member] \| Business Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.69%
C000006375 [Member] \| Steven Madden [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.32%
C000006375 [Member] \| Brinker International [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.73%
C000006375 [Member] \| Applied Industrial Technologies [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.69%
C000006375 [Member] \| Prestige Consumer Healthcare [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000006375 [Member] \| Summit Materials Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.47%
C000006375 [Member] \| Federal Signal [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006375 [Member] \| Q2 Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006375 [Member] \| Semtech [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006375 [Member] \| Boise Cascade [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006375 [Member] \| ExlService Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.35%
C000006375 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.35%
C000006375 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.97%
C000006375 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.59%
C000006375 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.51%
C000006375 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.08%
C000006375 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.34%
C000006375 [Member] \| Capital Goods [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.93%
C000006375 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.22%
C000006375 [Member] \| Basic Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.43%
C000006375 [Member] \| Business Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.69%
C000006376 [Member] \| Steven Madden [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.32%
C000006376 [Member] \| Brinker International [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.73%
C000006376 [Member] \| Applied Industrial Technologies [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.69%
C000006376 [Member] \| Prestige Consumer Healthcare [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000006376 [Member] \| Summit Materials Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.47%
C000006376 [Member] \| Federal Signal [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006376 [Member] \| Q2 Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000006376 [Member] \| Semtech [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006376 [Member] \| Boise Cascade [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000006376 [Member] \| ExlService Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.35%
C000006376 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.35%
C000006376 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.97%
C000006376 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.59%
C000006376 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.51%
C000006376 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.08%
C000006376 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.34%
C000006376 [Member] \| Capital Goods [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.93%
C000006376 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.22%
C000006376 [Member] \| Basic Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.43%
C000006376 [Member] \| Business Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.69%
C000171461 [Member] \| Steven Madden [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.32%
C000171461 [Member] \| Brinker International [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.73%
C000171461 [Member] \| Applied Industrial Technologies [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.69%
C000171461 [Member] \| Prestige Consumer Healthcare [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000171461 [Member] \| Summit Materials Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.47%
C000171461 [Member] \| Federal Signal [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000171461 [Member] \| Q2 Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.44%
C000171461 [Member] \| Semtech [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000171461 [Member] \| Boise Cascade [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.40%
C000171461 [Member] \| ExlService Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.35%
C000171461 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.35%
C000171461 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.97%
C000171461 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	12.59%
C000171461 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.51%
C000171461 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.08%
C000171461 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.34%
C000171461 [Member] \| Capital Goods [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.93%
C000171461 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.22%
C000171461 [Member] \| Basic Materials [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.43%
C000171461 [Member] \| Business Services [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.69%
C000006377 [Member] \| East West Bancorp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.12%
C000006377 [Member] \| Webster Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.03%
C000006377 [Member] \| Stifel Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000006377 [Member] \| Hancock Whitney [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.87%
C000006377 [Member] \| Synovus Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.83%
C000006377 [Member] \| Axis Capital Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.77%
C000006377 [Member] \| FNB [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.77%
C000006377 [Member] \| Columbia Banking System [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.76%
C000006377 [Member] \| MasTec [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000006377 [Member] \| ITT [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.67%
C000006377 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.14%
C000006377 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.73%
C000006377 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.80%
C000006377 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.68%
C000006377 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.45%
C000006377 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.59%
C000006377 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.49%
C000006377 [Member] \| Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000006377 [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.13%
C000006377 [Member] \| Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.91%
C000006377 [Member] \| Basic Industry [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.68%
C000006379 [Member] \| East West Bancorp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.12%
C000006379 [Member] \| Webster Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.03%
C000006379 [Member] \| Stifel Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000006379 [Member] \| Hancock Whitney [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.87%
C000006379 [Member] \| Synovus Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.83%
C000006379 [Member] \| Axis Capital Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.77%
C000006379 [Member] \| FNB [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.77%
C000006379 [Member] \| Columbia Banking System [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.76%
C000006379 [Member] \| MasTec [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000006379 [Member] \| ITT [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.67%
C000006379 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.14%
C000006379 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.73%
C000006379 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.80%
C000006379 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.68%
C000006379 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.45%
C000006379 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.59%
C000006379 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.49%
C000006379 [Member] \| Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000006379 [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.13%
C000006379 [Member] \| Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.91%
C000006379 [Member] \| Basic Industry [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.68%
C000006380 [Member] \| East West Bancorp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.12%
C000006380 [Member] \| Webster Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.03%
C000006380 [Member] \| Stifel Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000006380 [Member] \| Hancock Whitney [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.87%
C000006380 [Member] \| Synovus Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.83%
C000006380 [Member] \| Axis Capital Holdings [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.77%
C000006380 [Member] \| FNB [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.77%
C000006380 [Member] \| Columbia Banking System [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.76%
C000006380 [Member] \| MasTec [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000006380 [Member] \| ITT [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.67%
C000006380 [Member] \| Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	11.14%
C000006380 [Member] \| Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.73%
C000006380 [Member] \| Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.80%
C000006380 [Member] \| Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	29.68%
C000006380 [Member] \| Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.45%
C000006380 [Member] \| Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.59%
C000006380 [Member] \| Real Estate Investment Trusts [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.49%
C000006380 [Member] \| Transportation Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.30%
C000006380 [Member] \| Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	16.13%
C000006380 [Member] \| Utilities Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.91%
C000006380 [Member] \| Basic Industry [Member]
Holdings [Line Items]
Percent of Net Asset Value	7.68%
C000006381 [Member] \| East West Bancorp [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.12%
C000006381 [Member] \| Webster Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.03%
C000006381 [Member] \| Stifel Financial [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000006381 [Member] \| Hancock Whitney [Member]
Holdings [Line Items]

Shareholder Report, Holdings (Details)

Nov. 30, 2024