S000031375 [Member] Average Annual Total Returns	12 Months Ended	60 Months Ended	120 Months Ended	135 Months Ended	183 Months Ended	289 Months Ended	344 Months Ended
S000031375 [Member] Average Annual Total Returns	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025	Dec. 31, 2025
Russell 2000® Value Index (reflects no deductions for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	12.59%	8.88%	9.27%
Russell 3000® Index (reflects no deductions for fees, expenses or taxes)
Prospectus [Line Items]
Average Annual Return, Percent	17.15%	13.15%	14.29%
C000149224 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	5.84%	8.55%	8.18%
Performance Inception Date				Oct. 01, 2014
C000097587 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	(0.56%)	6.89%	7.13%
Performance Inception Date							Apr. 25, 1997
C000097587 [Member] \| After Taxes on Distributions
Prospectus [Line Items]
Average Annual Return, Percent	(2.95%)	4.68%	5.24%
Performance Inception Date							Apr. 25, 1997
C000097587 [Member] \| After Taxes on Distributions and Sales
Prospectus [Line Items]
Average Annual Return, Percent	1.28%	5.28%	5.45%
Performance Inception Date							Apr. 25, 1997
C000097593 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	5.78%	8.49%	8.12%
Performance Inception Date						Nov. 30, 2001
C000097594 [Member]
Prospectus [Line Items]
Average Annual Return, Percent	5.76%	8.43%	8.05%
Performance Inception Date					Sep. 27, 2010