Common Stock [Member] C000033215 [Member] C000033215 Investments [Domain] Automobiles [Member] Interactive Media and Services [Member] Interactive Media and Services Russell 1000 Growth [Member] Russell 1000 Growth Russell 1000 (Inception Date 12/1/16) [Member] Russell 1000 (Inception Date 12/1/16) Russell 1000 [Member] Russell 1000 Russell 1000 Growth (Inception Date 12/1/16) [Member] Russell 1000 Growth (Inception Date 12/1/16) Russell 1000 (Inception Date 4/1/19) [Member] Russell 1000 (Inception Date 4/1/19) C000174988 [Member] C000174988 Broadline Retail [Member] Broadline Retail Russell 1000 Growth (Inception Date 4/1/19) [Member] Russell 1000 Growth (Inception Date 4/1/19) Short-Term Investment [Member] Short-Term Investment Other Assets and Liabilities [Member] Other Assets and Liabilities C000212516 [Member] C000212516 C000033216 [Member] C000033216 Semiconductors and Semiconductor Equipment [Member] Semiconductors and Semiconductor Equipment Software [Member] Software C000033217 [Member] C000033217 C000033214 [Member] C000033214 Net Assets Investment Company, Portfolio Turnover Investment Type [Axis]