Shareholder Report, Average Annual Return (Details)		12 Months Ended	60 Months Ended	120 Months Ended
		Nov. 30, 2025	Nov. 30, 2025	Nov. 30, 2025
C000006436 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		C with CDSC (1% for 12 months)
Average Annual Return, Percent	[1]	10.49%	11.20%	14.46%
C000006435 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		B with CDSC (declining over six years from 4% to 0%)
Average Annual Return, Percent	[2]	7.77%	10.94%	14.46%
C000006430 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		A with initial sales charge (5.75%)
Average Annual Return, Percent		5.78%	10.72%	14.65%
Without Sales Load [Member] | C000102727 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		R6 without sales charge
Average Annual Return, Percent		12.62%	12.43%	15.72%
Without Sales Load [Member] | C000006431 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		R4 without sales charge
Average Annual Return, Percent		12.52%	12.32%	15.61%
Without Sales Load [Member] | C000006442 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		R3 without sales charge
Average Annual Return, Percent		12.23%	12.04%	15.32%
Without Sales Load [Member] | C000006441 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		R2 without sales charge
Average Annual Return, Percent		11.95%	11.76%	15.04%
Without Sales Load [Member] | C000006439 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		R1 without sales charge
Average Annual Return, Percent		11.40%	11.20%	14.46%
Without Sales Load [Member] | C000006437 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		I without sales charge
Average Annual Return, Percent		12.51%	12.32%	15.61%
Without Sales Load [Member] | C000006436 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		C without sales charge
Average Annual Return, Percent		11.40%	11.20%	14.46%
Without Sales Load [Member] | C000006435 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		B without sales charge
Average Annual Return, Percent		11.40%	11.20%	14.46%
Without Sales Load [Member] | C000006430 [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		A without sales charge
Average Annual Return, Percent		12.24%	12.04%	15.33%
Russell 3000 Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Russell 3000® Index
Average Annual Return, Percent	[3]	13.59%	14.15%	14.05%
Russell 1000 Growth Index [Member]
Average Annual Return [Line Items]
Line Graph and Table Measure Name		Russell 1000® Growth Index
Average Annual Return, Percent	[3]	20.35%	16.51%	18.03%

[1] Assuming redemption at the end of the applicable period.

[2] Assuming redemption at the end of the applicable period.

[3] Source: FactSet Research Systems Inc.