v3.26.1
Shareholder Report, Holdings (Details)
Feb. 28, 2026
C000072947 [Member] | Equity Real Estate Investment Trusts Reits [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.20%)
C000072947 [Member] | Pharmaceuticals Biotechnology And Life Sciences [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 9.90%
C000072947 [Member] | Consumer Staples Distribution And Retail [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 6.20%
C000072947 [Member] | Health Care Equipment And Services [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.00%
Percent of Total Short Exposure (2.20%)
C000072947 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 7.10%
C000072947 [Member] | Consumer Discretionary Distribution And Retail [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 9.50%
C000072947 [Member] | Technology Hardware And Equipment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 12.00%
C000072947 [Member] | Media And Entertainment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 10.80%
C000072947 [Member] | Software And Services [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 10.40%
Percent of Total Short Exposure (2.90%)
C000072947 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 12.90%
C000072947 [Member] | Capital Goods [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 19.10%
Percent of Total Short Exposure (5.90%)
C000072947 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.40%
C000072947 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 16.10%
Percent of Total Short Exposure (13.10%)
C000072947 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.60%
Percent of Total Short Exposure (2.90%)
C000072947 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.10%)
C000072947 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.60%)
C000072947 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.10%)
C000072947 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 7.40%
Percent of Total Short Exposure (2.60%)
C000072947 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 5.10%
Percent of Total Short Exposure (2.10%)
C000072947 [Member] | Common Stocks Sold Short [Member]  
Holdings [Line Items]  
Percent of Total Investments (40.70%) [1]
C000072947 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Total Investments 139.50% [1]
C000072947 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.20% [1]
C000072945 [Member] | Equity Real Estate Investment Trusts Reits [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.20%)
C000072945 [Member] | Pharmaceuticals Biotechnology And Life Sciences [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 9.90%
C000072945 [Member] | Consumer Staples Distribution And Retail [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 6.20%
C000072945 [Member] | Health Care Equipment And Services [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.00%
Percent of Total Short Exposure (2.20%)
C000072945 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 7.10%
C000072945 [Member] | Consumer Discretionary Distribution And Retail [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 9.50%
C000072945 [Member] | Technology Hardware And Equipment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 12.00%
C000072945 [Member] | Media And Entertainment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 10.80%
C000072945 [Member] | Software And Services [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 10.40%
Percent of Total Short Exposure (2.90%)
C000072945 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 12.90%
C000072945 [Member] | Capital Goods [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 19.10%
Percent of Total Short Exposure (5.90%)
C000072945 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.40%
C000072945 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 16.10%
Percent of Total Short Exposure (13.10%)
C000072945 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.60%
Percent of Total Short Exposure (2.90%)
C000072945 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.10%)
C000072945 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.60%)
C000072945 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.10%)
C000072945 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 7.40%
Percent of Total Short Exposure (2.60%)
C000072945 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 5.10%
Percent of Total Short Exposure (2.10%)
C000072945 [Member] | Common Stocks Sold Short [Member]  
Holdings [Line Items]  
Percent of Total Investments (40.70%) [2]
C000072945 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Total Investments 139.50% [2]
C000072945 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.20% [2]
C000072944 [Member] | Equity Real Estate Investment Trusts Reits [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.20%)
C000072944 [Member] | Pharmaceuticals Biotechnology And Life Sciences [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 9.90%
C000072944 [Member] | Consumer Staples Distribution And Retail [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 6.20%
C000072944 [Member] | Health Care Equipment And Services [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.00%
Percent of Total Short Exposure (2.20%)
C000072944 [Member] | Banks [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 7.10%
C000072944 [Member] | Consumer Discretionary Distribution And Retail [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 9.50%
C000072944 [Member] | Technology Hardware And Equipment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 12.00%
C000072944 [Member] | Media And Entertainment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 10.80%
C000072944 [Member] | Software And Services [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 10.40%
Percent of Total Short Exposure (2.90%)
C000072944 [Member] | Semiconductors And Semiconductor Equipment [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 12.90%
C000072944 [Member] | Capital Goods [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 19.10%
Percent of Total Short Exposure (5.90%)
C000072944 [Member] | Utilities Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.40%
C000072944 [Member] | Unclassified Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 16.10%
Percent of Total Short Exposure (13.10%)
C000072944 [Member] | Materials Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 4.60%
Percent of Total Short Exposure (2.90%)
C000072944 [Member] | Consumer Staples Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.10%)
C000072944 [Member] | Transportation Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.60%)
C000072944 [Member] | Insurance Sector [Member]  
Holdings [Line Items]  
Percent of Total Short Exposure (2.10%)
C000072944 [Member] | Financial Services Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 7.40%
Percent of Total Short Exposure (2.60%)
C000072944 [Member] | Energy Sector [Member]  
Holdings [Line Items]  
Percent of Total Long Exposure 5.10%
Percent of Total Short Exposure (2.10%)
C000072944 [Member] | Common Stocks Sold Short [Member]  
Holdings [Line Items]  
Percent of Total Investments (40.70%) [3]
C000072944 [Member] | Common Stock [Member]  
Holdings [Line Items]  
Percent of Total Investments 139.50% [3]
C000072944 [Member] | Repurchase Agreements [Member]  
Holdings [Line Items]  
Percent of Total Investments 1.20% [3]
[1] Includes the gross market value of the Fund’s long and short exposure and short-term repurchase agreements.
[2] Includes the gross market value of the Fund’s long and short exposure and short-term repurchase agreements.
[3] Includes the gross market value of the Fund’s long and short exposure and short-term repurchase agreements.