Shareholder Report, Holdings (Details)	Jun. 30, 2026
C000005443 \| Top10HoldingAgilent TechnologiesBNY-00846U101
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000005443 \| Top10HoldingKeysight TechnologiesBNY-49338L103
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000005443 \| Top10HoldingMettler-Toledo InternationalBNY-592688105
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000005443 \| Top10HoldingTeradyneBNY-880770102
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000005443 \| Top10HoldingMACOM Technology Solutions HoldingsBNY-55405Y100
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000005443 \| Top10HoldingDatadogBNY-23804L103
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000005443 \| Top10HoldingYum! BrandsBNY-988498101
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000005443 \| Top10HoldingBurlington StoresBNY-122017106
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000005443 \| Top10HoldingLattice SemiconductorBNY-518415104
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000005443 \| Top10HoldingAssurantBNY-04621X108
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000005443 \| Information Technology
Holdings [Line Items]
Percent of Net Asset Value	26.90%
C000005443 \| Industrials & Business Services
Holdings [Line Items]
Percent of Net Asset Value	19.50%
C000005443 \| Health Care
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000005443 \| Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000005443 \| Financials
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000005443 \| Energy
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000005443 \| Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	3.40%
C000005443 \| Communication Services
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000005443 \| Materials
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000005443 \| Investment TypeOther Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	3.10%
C000005444 \| Top10HoldingAgilent TechnologiesBNY-00846U101
Holdings [Line Items]
Percent of Net Asset Value	2.40%
C000005444 \| Top10HoldingKeysight TechnologiesBNY-49338L103
Holdings [Line Items]
Percent of Net Asset Value	2.10%
C000005444 \| Top10HoldingMettler-Toledo InternationalBNY-592688105
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000005444 \| Top10HoldingTeradyneBNY-880770102
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000005444 \| Top10HoldingMACOM Technology Solutions HoldingsBNY-55405Y100
Holdings [Line Items]
Percent of Net Asset Value	2.00%
C000005444 \| Top10HoldingDatadogBNY-23804L103
Holdings [Line Items]
Percent of Net Asset Value	1.90%
C000005444 \| Top10HoldingYum! BrandsBNY-988498101
Holdings [Line Items]
Percent of Net Asset Value	1.80%
C000005444 \| Top10HoldingBurlington StoresBNY-122017106
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000005444 \| Top10HoldingLattice SemiconductorBNY-518415104
Holdings [Line Items]
Percent of Net Asset Value	1.70%
C000005444 \| Top10HoldingAssurantBNY-04621X108
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000005444 \| Information Technology
Holdings [Line Items]
Percent of Net Asset Value	26.90%
C000005444 \| Industrials & Business Services
Holdings [Line Items]
Percent of Net Asset Value	19.50%
C000005444 \| Health Care
Holdings [Line Items]
Percent of Net Asset Value	18.30%
C000005444 \| Consumer Discretionary
Holdings [Line Items]
Percent of Net Asset Value	13.60%
C000005444 \| Financials
Holdings [Line Items]
Percent of Net Asset Value	6.60%
C000005444 \| Energy
Holdings [Line Items]
Percent of Net Asset Value	3.90%
C000005444 \| Consumer Staples
Holdings [Line Items]
Percent of Net Asset Value	3.40%
C000005444 \| Communication Services
Holdings [Line Items]
Percent of Net Asset Value	3.20%
C000005444 \| Materials
Holdings [Line Items]
Percent of Net Asset Value	1.50%
C000005444 \| Investment TypeOther Holdings Grouping
Holdings [Line Items]
Percent of Net Asset Value	3.10%