Shareholder Report, Holdings (Details)	Mar. 31, 2025
C000004047 [Member] | Sprouts Farmers Market Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%	[1]
C000004047 [Member] | Corcept Therapeutics Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%	[1]
C000004047 [Member] | ExlService Holdings Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[1]
C000004047 [Member] | Insmed Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[1]
C000004047 [Member] | FTAI Aviation Ltd [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[1]
C000004047 [Member] | Primoris Services Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[1]
C000004047 [Member] | Moog Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%	[1]
C000004047 [Member] | Piper Sandler Cos [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[1]
C000004047 [Member] | PJT Partners Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[1]
C000004047 [Member] | Fabrinet [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[1]
C000004047 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%	[2]
C000004047 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.40%	[2]
C000004047 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%	[2]
C000004047 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%	[2]
C000004047 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%	[2]
C000004047 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%	[2]
C000004047 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.00%	[2]
C000004047 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%	[2]
C000004047 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%	[2]
C000004047 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[2]
C000004047 [Member] | Short-Term Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%	[2]
C000004047 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(5.60%)	[2]
C000004049 [Member] | Sprouts Farmers Market Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%	[3]
C000004049 [Member] | Corcept Therapeutics Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%	[3]
C000004049 [Member] | ExlService Holdings Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[3]
C000004049 [Member] | Insmed Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[3]
C000004049 [Member] | FTAI Aviation Ltd [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[3]
C000004049 [Member] | Primoris Services Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[3]
C000004049 [Member] | Moog Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%	[3]
C000004049 [Member] | Piper Sandler Cos [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[3]
C000004049 [Member] | PJT Partners Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[3]
C000004049 [Member] | Fabrinet [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[3]
C000004049 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%	[4]
C000004049 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.40%	[4]
C000004049 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%	[4]
C000004049 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%	[4]
C000004049 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%	[4]
C000004049 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%	[4]
C000004049 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.00%	[4]
C000004049 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%	[4]
C000004049 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%	[4]
C000004049 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[4]
C000004049 [Member] | Short-Term Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%	[4]
C000004049 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(5.60%)	[4]
C000198224 [Member] | Sprouts Farmers Market Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%	[5]
C000198224 [Member] | Corcept Therapeutics Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%	[5]
C000198224 [Member] | ExlService Holdings Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[5]
C000198224 [Member] | Insmed Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[5]
C000198224 [Member] | FTAI Aviation Ltd [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[5]
C000198224 [Member] | Primoris Services Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[5]
C000198224 [Member] | Moog Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%	[5]
C000198224 [Member] | Piper Sandler Cos [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[5]
C000198224 [Member] | PJT Partners Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[5]
C000198224 [Member] | Fabrinet [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[5]
C000198224 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%	[6]
C000198224 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.40%	[6]
C000198224 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%	[6]
C000198224 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%	[6]
C000198224 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%	[6]
C000198224 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%	[6]
C000198224 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.00%	[6]
C000198224 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%	[6]
C000198224 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%	[6]
C000198224 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[6]
C000198224 [Member] | Short-Term Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%	[6]
C000198224 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(5.60%)	[6]
C000037627 [Member] | Sprouts Farmers Market Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.50%	[7]
C000037627 [Member] | Corcept Therapeutics Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.20%	[7]
C000037627 [Member] | ExlService Holdings Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[7]
C000037627 [Member] | Insmed Inc [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.00%	[7]
C000037627 [Member] | FTAI Aviation Ltd [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[7]
C000037627 [Member] | Primoris Services Corp [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.90%	[7]
C000037627 [Member] | Moog Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.80%	[7]
C000037627 [Member] | Piper Sandler Cos [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[7]
C000037627 [Member] | PJT Partners Inc Class A [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[7]
C000037627 [Member] | Fabrinet [Member]
Holdings [Line Items]
Percent of Net Asset Value	0.70%	[7]
C000037627 [Member] | Energy Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.20%	[8]
C000037627 [Member] | Financial Services Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	8.40%	[8]
C000037627 [Member] | Healthcare Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	25.70%	[8]
C000037627 [Member] | Real Estate Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	1.70%	[8]
C000037627 [Member] | Communications Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	2.40%	[8]
C000037627 [Member] | Consumer Discretionary Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	10.50%	[8]
C000037627 [Member] | Consumer Staples Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	4.00%	[8]
C000037627 [Member] | Industrial Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	22.30%	[8]
C000037627 [Member] | Information Technology Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	18.30%	[8]
C000037627 [Member] | Materials Sector [Member]
Holdings [Line Items]
Percent of Net Asset Value	3.20%	[8]
C000037627 [Member] | Short-Term Investments [Member]
Holdings [Line Items]
Percent of Net Asset Value	6.90%	[8]
C000037627 [Member] | Liabilities in Excess of Other Assets [Member]
Holdings [Line Items]
Percent of Net Asset Value	(5.60%)	[8]

[1] Excludes short-term securities.

[2] For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.

[3] Excludes short-term securities.

[4] For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.

[5] Excludes short-term securities.

[6] For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.

[7] Excludes short-term securities.

[8] For purposes of this report, sector sub-classifications may differ from those utilized by the Fund for compliance purposes.