v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000088313 [Member] | UNITED KINGDOM  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000088313 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 46.60%
C000088313 [Member] | GERMANY  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000088313 [Member] | GUERNSEY  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000088313 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000088313 [Member] | NETHERLANDS  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000088313 [Member] | NEW ZEALAND  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000088313 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000088313 [Member] | SOUTH AFRICA  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000088313 [Member] | SPAIN  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000088313 [Member] | AUSTRALIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000088313 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000088313 [Member] | CANADA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000088313 [Member] | FRANCE  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000088313 [Member] | Forward Contracts Purchased in USD [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 75.10%
C000088313 [Member] | Foreign Governmental [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 84.50%
C000088313 [Member] | Corporate Bonds and Notes [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 51.40%
C000088313 [Member] | Equity Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.40%
C000088313 [Member] | Equity Securities Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 2.20%
C000088313 [Member] | Interest Rate Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 3.10%
C000088313 [Member] | Investment Companies [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 94.10%
C000088313 [Member] | Equity Securities Common Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 121.40%
C000088313 [Member] | US Treasury Securities [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 7.20%
C000088313 [Member] | Equity Written Put Options [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.20%
C000088313 [Member] | Equity Purchased Put Options [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (0.80%)
C000088313 [Member] | Equity Total Return Swap Paid Fixed Rate [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (36.70%)
C000088313 [Member] | Credit Default Swap Sell Protection [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (5.50%)
C000088313 [Member] | Interest Rate Futures Short [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (91.00%)
C000088313 [Member] | Forward Contracts Sold in USD [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (205.60%)
C000088313 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
C000088314 [Member] | UNITED KINGDOM  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000088314 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 46.60%
C000088314 [Member] | GERMANY  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000088314 [Member] | GUERNSEY  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000088314 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000088314 [Member] | NETHERLANDS  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000088314 [Member] | NEW ZEALAND  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000088314 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000088314 [Member] | SOUTH AFRICA  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000088314 [Member] | SPAIN  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000088314 [Member] | AUSTRALIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000088314 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000088314 [Member] | CANADA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000088314 [Member] | FRANCE  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000088314 [Member] | Forward Contracts Purchased in USD [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 75.10%
C000088314 [Member] | Foreign Governmental [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 84.50%
C000088314 [Member] | Corporate Bonds and Notes [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 51.40%
C000088314 [Member] | Equity Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.40%
C000088314 [Member] | Equity Securities Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 2.20%
C000088314 [Member] | Interest Rate Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 3.10%
C000088314 [Member] | Investment Companies [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 94.10%
C000088314 [Member] | Equity Securities Common Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 121.40%
C000088314 [Member] | US Treasury Securities [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 7.20%
C000088314 [Member] | Equity Written Put Options [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.20%
C000088314 [Member] | Equity Purchased Put Options [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (0.80%)
C000088314 [Member] | Equity Total Return Swap Paid Fixed Rate [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (36.70%)
C000088314 [Member] | Credit Default Swap Sell Protection [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (5.50%)
C000088314 [Member] | Interest Rate Futures Short [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (91.00%)
C000088314 [Member] | Forward Contracts Sold in USD [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (205.60%)
C000088314 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
C000088315 [Member] | UNITED KINGDOM  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000088315 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 46.60%
C000088315 [Member] | GERMANY  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000088315 [Member] | GUERNSEY  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000088315 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000088315 [Member] | NETHERLANDS  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000088315 [Member] | NEW ZEALAND  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000088315 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000088315 [Member] | SOUTH AFRICA  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000088315 [Member] | SPAIN  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000088315 [Member] | AUSTRALIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000088315 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000088315 [Member] | CANADA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000088315 [Member] | FRANCE  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000088315 [Member] | Forward Contracts Purchased in USD [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 75.10%
C000088315 [Member] | Foreign Governmental [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 84.50%
C000088315 [Member] | Corporate Bonds and Notes [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 51.40%
C000088315 [Member] | Equity Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.40%
C000088315 [Member] | Equity Securities Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 2.20%
C000088315 [Member] | Interest Rate Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 3.10%
C000088315 [Member] | Investment Companies [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 94.10%
C000088315 [Member] | Equity Securities Common Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 121.40%
C000088315 [Member] | US Treasury Securities [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 7.20%
C000088315 [Member] | Equity Written Put Options [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.20%
C000088315 [Member] | Equity Purchased Put Options [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (0.80%)
C000088315 [Member] | Equity Total Return Swap Paid Fixed Rate [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (36.70%)
C000088315 [Member] | Credit Default Swap Sell Protection [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (5.50%)
C000088315 [Member] | Interest Rate Futures Short [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (91.00%)
C000088315 [Member] | Forward Contracts Sold in USD [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (205.60%)
C000088315 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%
C000130431 [Member] | UNITED KINGDOM  
Holdings [Line Items]  
Percent of Net Asset Value 11.30%
C000130431 [Member] | UNITED STATES  
Holdings [Line Items]  
Percent of Net Asset Value 46.60%
C000130431 [Member] | GERMANY  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000130431 [Member] | GUERNSEY  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000130431 [Member] | MEXICO  
Holdings [Line Items]  
Percent of Net Asset Value 4.00%
C000130431 [Member] | NETHERLANDS  
Holdings [Line Items]  
Percent of Net Asset Value 6.00%
C000130431 [Member] | NEW ZEALAND  
Holdings [Line Items]  
Percent of Net Asset Value 3.60%
C000130431 [Member] | ROMANIA  
Holdings [Line Items]  
Percent of Net Asset Value 1.00%
C000130431 [Member] | SOUTH AFRICA  
Holdings [Line Items]  
Percent of Net Asset Value 2.50%
C000130431 [Member] | SPAIN  
Holdings [Line Items]  
Percent of Net Asset Value 1.50%
C000130431 [Member] | AUSTRALIA  
Holdings [Line Items]  
Percent of Net Asset Value 2.30%
C000130431 [Member] | BRAZIL  
Holdings [Line Items]  
Percent of Net Asset Value 4.70%
C000130431 [Member] | CANADA  
Holdings [Line Items]  
Percent of Net Asset Value 3.20%
C000130431 [Member] | FRANCE  
Holdings [Line Items]  
Percent of Net Asset Value 3.00%
C000130431 [Member] | Forward Contracts Purchased in USD [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 75.10%
C000130431 [Member] | Foreign Governmental [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 84.50%
C000130431 [Member] | Corporate Bonds and Notes [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 51.40%
C000130431 [Member] | Equity Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.40%
C000130431 [Member] | Equity Securities Preferred Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 2.20%
C000130431 [Member] | Interest Rate Futures Long [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 3.10%
C000130431 [Member] | Investment Companies [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 94.10%
C000130431 [Member] | Equity Securities Common Stocks [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 121.40%
C000130431 [Member] | US Treasury Securities [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 7.20%
C000130431 [Member] | Equity Written Put Options [Member]  
Holdings [Line Items]  
Percent of Net Long Exposure 0.20%
C000130431 [Member] | Equity Purchased Put Options [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (0.80%)
C000130431 [Member] | Equity Total Return Swap Paid Fixed Rate [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (36.70%)
C000130431 [Member] | Credit Default Swap Sell Protection [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (5.50%)
C000130431 [Member] | Interest Rate Futures Short [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (91.00%)
C000130431 [Member] | Forward Contracts Sold in USD [Member]  
Holdings [Line Items]  
Percent of Net Short Exposure (205.60%)
C000130431 [Member] | Net Other Assets and Liabilities [Member]  
Holdings [Line Items]  
Percent of Net Asset Value 7.80%