The Hanover Insurance Group Inc [Member] MKS Inc [Member] ITT Inc [Member] Semtech Corp [Member] Dycom Industries Inc [Member] TechnipFMC PLC [Member] Everpure Inc Cl A [Member] First Horizon Corp [Member] ATI Inc [Member] Sterling Infrastructure Inc [Member] C000007612 [Member] Service Shares C000007611 [Member] Initial Shares Real Estate Sector [Member] Healthcare Sector [Member] Financial Services Sector [Member] Energy Sector [Member] C000007613 [Member] iShares Core S And P Small Cap ETF [Member] FormFactor Inc [Member] Viasat Inc [Member] Molina Healthcare Inc [Member] Argan Inc [Member] BrightSpring Health Services Inc [Member] Element Solutions Inc [Member] Krystal Biotech Inc [Member] ESCO Technologies Inc [Member] MaxLinear Inc [Member] Net Other Assets and Liabilities [Member] Investment Companies [Member] Amazon com Inc [Member] Texas Instruments Inc [Member] NVIDIA Corp [Member] Advanced Micro Devices Inc [Member] Lam Research Corp [Member] Applied Materials Inc [Member] Intel Corp [Member] Marvell Technology Inc [Member] Taiwan Semiconductor Manufacturing Co Ltd [Member] Micron Technology Inc [Member] C000007615 [Member] C000007614 [Member] Investment Type [Axis] Net Assets Investment Company Portfolio Turnover No Trading Symbol Flag