v3.26.1
Shareholder Report, Holdings (Details)
Apr. 30, 2026
C000049094 | Other RowCommunication Services  
Holdings [Line Items]  
Percent of Total Investments 14.30%
C000049094 | Financials  
Holdings [Line Items]  
Percent of Total Investments 30.20%
C000049094 | Energy  
Holdings [Line Items]  
Percent of Total Investments 15.10%
C000049094 | Utilities  
Holdings [Line Items]  
Percent of Total Investments 11.80%
C000049094 | Communication Services  
Holdings [Line Items]  
Percent of Total Investments 10.10%
C000049094 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Total Investments 9.70%
C000049094 | Consumer Staples  
Holdings [Line Items]  
Percent of Total Investments 7.20%
C000049094 | Industrials  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000049094 | Materials  
Holdings [Line Items]  
Percent of Total Investments 5.90%
C000049094 | Real Estate  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000049094 | Information Technology  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000049094 | United Kingdom  
Holdings [Line Items]  
Percent of Total Investments 17.00%
C000049094 | France  
Holdings [Line Items]  
Percent of Total Investments 14.80%
C000049094 | Spain  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000049094 | Italy  
Holdings [Line Items]  
Percent of Total Investments 10.20%
C000049094 | Germany  
Holdings [Line Items]  
Percent of Total Investments 6.50%
C000049094 | Hong Kong  
Holdings [Line Items]  
Percent of Total Investments 6.50%
C000049094 | Canada  
Holdings [Line Items]  
Percent of Total Investments 5.70%
C000049094 | Norway  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000049094 | Sweden  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000049094 | Netherlands  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000012060 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000012060 | Apple, Inc.  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000012060 | Microsoft Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000012060 | Amazon.com, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000012060 | Alphabet, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000012060 | Broadcom, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012060 | Alphabet, Inc.Class CNVS  
Holdings [Line Items]  
Percent of Total Investments 2.70%
C000012060 | Meta Platforms, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000012060 | Tesla, Inc.  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000012060 | Berkshire Hathaway, Inc.Class B  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000012060 | Financials  
Holdings [Line Items]  
Percent of Total Investments 12.20%
C000012060 | Energy  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000012060 | Utilities  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000012060 | Communication Services  
Holdings [Line Items]  
Percent of Total Investments 10.50%
C000012060 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Total Investments 10.00%
C000012060 | Consumer Staples  
Holdings [Line Items]  
Percent of Total Investments 4.80%
C000012060 | Industrials  
Holdings [Line Items]  
Percent of Total Investments 9.60%
C000012060 | Materials  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000012060 | Real Estate  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000012060 | Information Technology  
Holdings [Line Items]  
Percent of Total Investments 34.00%
C000012060 | Health Care  
Holdings [Line Items]  
Percent of Total Investments 8.60%
C000038163 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Total Investments 14.50%
C000038163 | Microsoft Corp.  
Holdings [Line Items]  
Percent of Total Investments 8.60%
C000038163 | Alphabet, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000038163 | Alphabet, Inc.Class CNVS  
Holdings [Line Items]  
Percent of Total Investments 5.50%
C000038163 | Tesla, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000038163 | Advanced Micro Devices, Inc.  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000038163 | Visa, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000038163 | Intel Corp.  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000038163 | Mastercard, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000038163 | Caterpillar, Inc.  
Holdings [Line Items]  
Percent of Total Investments 1.20%
C000038163 | Financials  
Holdings [Line Items]  
Percent of Total Investments 10.60%
C000038163 | Energy  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000038163 | Utilities  
Holdings [Line Items]  
Percent of Total Investments 0.90%
C000038163 | Communication Services  
Holdings [Line Items]  
Percent of Total Investments 13.90%
C000038163 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000038163 | Consumer Staples  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000038163 | Industrials  
Holdings [Line Items]  
Percent of Total Investments 9.00%
C000038163 | Materials  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000038163 | Real Estate  
Holdings [Line Items]  
Percent of Total Investments 2.70%
C000038163 | Information Technology  
Holdings [Line Items]  
Percent of Total Investments 39.50%
C000038163 | Health Care  
Holdings [Line Items]  
Percent of Total Investments 7.10%
C000012199 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Total Investments 7.90%
C000012199 | Apple, Inc.  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000012199 | Microsoft Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000012199 | Alphabet, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012199 | Broadcom, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000012199 | Alphabet, Inc.Class CNVS  
Holdings [Line Items]  
Percent of Total Investments 3.80%
C000012199 | Tesla, Inc.  
Holdings [Line Items]  
Percent of Total Investments 1.60%
C000012199 | Hartford Insurance Group, Inc. (The)  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000012199 | Applied Materials, Inc.  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000012199 | Morgan Stanley  
Holdings [Line Items]  
Percent of Total Investments 1.40%
C000012199 | Financials  
Holdings [Line Items]  
Percent of Total Investments 11.90%
C000012199 | Energy  
Holdings [Line Items]  
Percent of Total Investments 3.80%
C000012199 | Utilities  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000012199 | Communication Services  
Holdings [Line Items]  
Percent of Total Investments 8.50%
C000012199 | Consumer Discretionary  
Holdings [Line Items]  
Percent of Total Investments 5.90%
C000012199 | Consumer Staples  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000012199 | Industrials  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000012199 | Materials  
Holdings [Line Items]  
Percent of Total Investments 2.70%
C000012199 | Real Estate  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000012199 | Information Technology  
Holdings [Line Items]  
Percent of Total Investments 38.30%
C000012199 | Health Care  
Holdings [Line Items]  
Percent of Total Investments 9.00%
C000012048 | Linde PLC  
Holdings [Line Items]  
Percent of Total Investments 19.90%
C000012048 | Newmont Corp.  
Holdings [Line Items]  
Percent of Total Investments 10.50%
C000012048 | Freeport-McMoRan, Inc.  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000012048 | Ecolab, Inc.  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000012048 | Air Products and Chemicals, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.80%
C000012048 | Nucor Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000012048 | Fastenal Co.  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000012048 | Anglogold Ashanti PLC  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000012048 | Steel Dynamics, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000012048 | Albemarle Corp.  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000012048 | Chemicals  
Holdings [Line Items]  
Percent of Total Investments 46.70%
C000012048 | Metals & Mining  
Holdings [Line Items]  
Percent of Total Investments 38.60%
C000012048 | Machinery  
Holdings [Line Items]  
Percent of Total Investments 4.50%
C000012048 | Trading Companies & Distributors  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000012048 | Containers & Packaging  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000012048 | Aerospace & Defense  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000012050 | Amazon.com, Inc.  
Holdings [Line Items]  
Percent of Total Investments 15.00%
C000012050 | Tesla, Inc.  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000012050 | Walmart, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.60%
C000012050 | Costco Wholesale Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000012050 | Netflix, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000012050 | Home Depot, Inc. (The)  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000012050 | McDonald's Corp.  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000012050 | Walt Disney Co. (The)  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012050 | TJX Companies, Inc. (The)  
Holdings [Line Items]  
Percent of Total Investments 2.90%
C000012050 | Uber Technologies, Inc.  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000012050 | Consumer Discretionary Distribution & Retail0  
Holdings [Line Items]  
Percent of Total Investments 33.60%
C000012050 | Consumer Services2.47  
Holdings [Line Items]  
Percent of Total Investments 19.10%
C000012050 | Media & Entertainment0  
Holdings [Line Items]  
Percent of Total Investments 14.00%
C000012050 | Automobiles & Components0  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000012050 | Consumer Staples Distribution & Retail0.72  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000012050 | Consumer Durables & Apparel1.1  
Holdings [Line Items]  
Percent of Total Investments 5.90%
C000012050 | Transportation0  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000012050 | Commercial & Professional Services1.25  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000012050 | Household & Personal Products1.83  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000012050 | Capital Goods0  
Holdings [Line Items]  
Percent of Total Investments 0.10%
C000012194 | Procter & Gamble Co. (The)  
Holdings [Line Items]  
Percent of Total Investments 13.60%
C000012194 | Coca-Cola Co. (The)  
Holdings [Line Items]  
Percent of Total Investments 12.20%
C000012194 | Philip Morris International, Inc.  
Holdings [Line Items]  
Percent of Total Investments 10.30%
C000012194 | PepsiCo, Inc.  
Holdings [Line Items]  
Percent of Total Investments 8.80%
C000012194 | Altria Group, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.90%
C000012194 | CVS Health Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.30%
C000012194 | McKesson Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000012194 | Mondelez International, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000012194 | Colgate-Palmolive Co.  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000012194 | Corteva, Inc.  
Holdings [Line Items]  
Percent of Total Investments 2.70%
C000012194 | Food, Beverage & Tobacco2.62  
Holdings [Line Items]  
Percent of Total Investments 57.20%
C000012194 | Household & Personal Products2.9  
Holdings [Line Items]  
Percent of Total Investments 21.70%
C000012194 | Health Care Equipment & Services3.19  
Holdings [Line Items]  
Percent of Total Investments 10.90%
C000012194 | Consumer Staples Distribution & Retail2.01  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000012194 | Materials0.88  
Holdings [Line Items]  
Percent of Total Investments 2.70%
C000012051 | Exxon Mobil Corp.  
Holdings [Line Items]  
Percent of Total Investments 21.70%
C000012051 | Chevron Corp.  
Holdings [Line Items]  
Percent of Total Investments 15.40%
C000012051 | ConocoPhillips  
Holdings [Line Items]  
Percent of Total Investments 6.50%
C000012051 | Williams Companies, Inc. (The)  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000012051 | SLB Ltd.  
Holdings [Line Items]  
Percent of Total Investments 3.90%
C000012051 | EOG Resources, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000012051 | Valero Energy Corp.  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000012051 | Marathon Petroleum Corp.  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000012051 | Phillips 66  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000012051 | Baker Hughes Co.  
Holdings [Line Items]  
Percent of Total Investments 3.10%
C000012051 | Oil, Gas & Consumable Fuels  
Holdings [Line Items]  
Percent of Total Investments 88.20%
C000012051 | Energy Equipment & Services  
Holdings [Line Items]  
Percent of Total Investments 10.70%
C000012051 | Semiconductors & Semiconductor Equipment  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000012052 | Berkshire Hathaway, Inc.Class B  
Holdings [Line Items]  
Percent of Total Investments 12.90%
C000012052 | Visa, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000012052 | Mastercard, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 6.10%
C000012052 | Morgan Stanley  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000012052 | JPMorgan Chase & Co.  
Holdings [Line Items]  
Percent of Total Investments 12.60%
C000012052 | Bank of America Corp.  
Holdings [Line Items]  
Percent of Total Investments 5.30%
C000012052 | Goldman Sachs Group, Inc. (The)  
Holdings [Line Items]  
Percent of Total Investments 4.10%
C000012052 | Wells Fargo & Co.  
Holdings [Line Items]  
Percent of Total Investments 3.80%
C000012052 | Citigroup, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000012052 | American Express Co.  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000012052 | Financial Services0  
Holdings [Line Items]  
Percent of Total Investments 65.70%
C000012052 | Banks1.88  
Holdings [Line Items]  
Percent of Total Investments 34.30%
C000012053 | Berkshire Hathaway, Inc.Class B  
Holdings [Line Items]  
Percent of Total Investments 10.90%
C000012053 | Morgan Stanley  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000012053 | JPMorgan Chase & Co.  
Holdings [Line Items]  
Percent of Total Investments 10.80%
C000012053 | Bank of America Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000012053 | Goldman Sachs Group, Inc. (The)  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000012053 | Wells Fargo & Co.  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000012053 | Citigroup, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000012053 | BlackRock, Inc.  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000012053 | Charles Schwab Corp. (The)  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000012053 | S&P Global, Inc.  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000012053 | Financial Services0  
Holdings [Line Items]  
Percent of Total Investments 47.60%
C000012053 | Banks1.88  
Holdings [Line Items]  
Percent of Total Investments 33.60%
C000012053 | Insurance0.2  
Holdings [Line Items]  
Percent of Total Investments 18.30%
C000012053 | Commercial & Professional Services2.47  
Holdings [Line Items]  
Percent of Total Investments 0.30%
C000012053 | Software & Services0  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000012054 | Eli Lilly & Co.  
Holdings [Line Items]  
Percent of Total Investments 13.80%
C000012054 | Johnson & Johnson  
Holdings [Line Items]  
Percent of Total Investments 10.20%
C000012054 | AbbVie, Inc.  
Holdings [Line Items]  
Percent of Total Investments 6.90%
C000012054 | UnitedHealth Group, Inc.  
Holdings [Line Items]  
Percent of Total Investments 6.20%
C000012054 | Merck & Co., Inc.  
Holdings [Line Items]  
Percent of Total Investments 5.00%
C000012054 | Amgen, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000012054 | Thermo Fisher Scientific, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000012054 | Gilead Sciences, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012054 | Intuitive Surgical, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012054 | Abbott Laboratories  
Holdings [Line Items]  
Percent of Total Investments 2.90%
C000012054 | Pharmaceuticals  
Holdings [Line Items]  
Percent of Total Investments 36.10%
C000012054 | Biotechnology  
Holdings [Line Items]  
Percent of Total Investments 21.90%
C000012054 | Health Care Equipment & Supplies  
Holdings [Line Items]  
Percent of Total Investments 18.10%
C000012054 | Health Care Providers & Services  
Holdings [Line Items]  
Percent of Total Investments 14.30%
C000012054 | Life Sciences Tools & Services  
Holdings [Line Items]  
Percent of Total Investments 9.10%
C000012054 | Health Care Technology  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000012054 | Capital Markets  
Holdings [Line Items]  
Percent of Total Investments 0.00% [1]
C000012055 | Visa, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 7.00%
C000012055 | Mastercard, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000012055 | Caterpillar, Inc.  
Holdings [Line Items]  
Percent of Total Investments 5.20%
C000012055 | American Express Co.  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000012055 | General Electric Co.  
Holdings [Line Items]  
Percent of Total Investments 3.80%
C000012055 | GE Vernova, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000012055 | RTX Corp.  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012055 | Boeing Co. (The)  
Holdings [Line Items]  
Percent of Total Investments 2.20%
C000012055 | Eaton Corp. PLC  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000012055 | Union Pacific Corp.  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000012055 | Capital Goods0.68  
Holdings [Line Items]  
Percent of Total Investments 58.30%
C000012055 | Financial Services0.76  
Holdings [Line Items]  
Percent of Total Investments 18.90%
C000012055 | Transportation1.17  
Holdings [Line Items]  
Percent of Total Investments 8.40%
C000012055 | Materials0.53  
Holdings [Line Items]  
Percent of Total Investments 5.60%
C000012055 | Commercial & Professional Services3.06  
Holdings [Line Items]  
Percent of Total Investments 4.20%
C000012055 | Software & Services3.56  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000012055 | Technology Hardware & Equipment0  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000012055 | Consumer Durables & Apparel2.18  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000012055 | Pharmaceuticals, Biotechnology & Life Sciences0  
Holdings [Line Items]  
Percent of Total Investments 0.30%
C000012055 | Semiconductors & Semiconductor Equipment0.32  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000012055 | Other RowConsumer Services  
Holdings [Line Items]  
Percent of Total Investments 0.00% [2]
C000012059 | NVIDIA Corp.  
Holdings [Line Items]  
Percent of Total Investments 16.20%
C000012059 | Apple, Inc.  
Holdings [Line Items]  
Percent of Total Investments 13.60%
C000012059 | Microsoft Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.00%
C000012059 | Alphabet, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000012059 | Broadcom, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.80%
C000012059 | Alphabet, Inc.Class CNVS  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000012059 | Meta Platforms, Inc.Class A  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000012059 | Advanced Micro Devices, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000012059 | Intel Corp.  
Holdings [Line Items]  
Percent of Total Investments 2.60%
C000012059 | Micron Technology, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012059 | Other RowMedia  
Holdings [Line Items]  
Percent of Total Investments 0.20%
C000012059 | Semiconductors & Semiconductor Equipment  
Holdings [Line Items]  
Percent of Total Investments 41.60%
C000012059 | Interactive Media & Services  
Holdings [Line Items]  
Percent of Total Investments 17.30%
C000012059 | Software  
Holdings [Line Items]  
Percent of Total Investments 16.70%
C000012059 | Technology Hardware, Storage & Peripherals  
Holdings [Line Items]  
Percent of Total Investments 16.60%
C000012059 | IT Services  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012059 | Electronic Equipment, Instruments & Components  
Holdings [Line Items]  
Percent of Total Investments 2.90%
C000012059 | Electrical Equipment  
Holdings [Line Items]  
Percent of Total Investments 0.80%
C000012059 | Hotels, Restaurants & Leisure  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000012059 | Professional Services  
Holdings [Line Items]  
Percent of Total Investments 0.40%
C000012059 | Communications Equipment  
Holdings [Line Items]  
Percent of Total Investments 0.10%
C000012061 | Uber Technologies, Inc.  
Holdings [Line Items]  
Percent of Total Investments 15.90%
C000012061 | Union Pacific Corp.  
Holdings [Line Items]  
Percent of Total Investments 16.50%
C000012061 | FedEx Corp.  
Holdings [Line Items]  
Percent of Total Investments 9.00%
C000012061 | Delta Air Lines, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.80%
C000012061 | CSX Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000012061 | Old Dominion Freight Line, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.70%
C000012061 | United Parcel Service, Inc.Class B  
Holdings [Line Items]  
Percent of Total Investments 4.50%
C000012061 | Norfolk Southern Corp.  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000012061 | United Airlines Holdings, Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.10%
C000012061 | XPO, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000012061 | Ground Transportation  
Holdings [Line Items]  
Percent of Total Investments 62.00%
C000012061 | Air Freight & Logistics  
Holdings [Line Items]  
Percent of Total Investments 20.80%
C000012061 | Passenger Airlines  
Holdings [Line Items]  
Percent of Total Investments 15.10%
C000012061 | Marine Transportation  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000012062 | NextEra Energy, Inc.  
Holdings [Line Items]  
Percent of Total Investments 12.20%
C000012062 | Southern Co. (The)  
Holdings [Line Items]  
Percent of Total Investments 6.40%
C000012062 | Duke Energy Corp.  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000012062 | Constellation Energy Corp.  
Holdings [Line Items]  
Percent of Total Investments 5.90%
C000012062 | Waste Management, Inc.  
Holdings [Line Items]  
Percent of Total Investments 5.20%
C000012062 | American Electric Power Co., Inc.  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000012062 | Sempra  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000012062 | Dominion Energy, Inc.  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000012062 | Vistra Corp.  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000012062 | Entergy Corp.  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000012062 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 58.40%
C000012062 | Multi-Utilities  
Holdings [Line Items]  
Percent of Total Investments 22.40%
C000012062 | Commercial Services & Supplies  
Holdings [Line Items]  
Percent of Total Investments 8.70%
C000012062 | Independent Power and Renewable Electricity Producers  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000012062 | Gas Utilities  
Holdings [Line Items]  
Percent of Total Investments 3.00%
C000012062 | Water Utilities  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000065074 | Other RowInformation Technology  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000065074 | Electric Utilities  
Holdings [Line Items]  
Percent of Total Investments 11.30%
C000065074 | Renewable Electricity  
Holdings [Line Items]  
Percent of Total Investments 24.60%
C000065074 | Heavy Electrical Equipment  
Holdings [Line Items]  
Percent of Total Investments 24.50%
C000065074 | Electrical Components & Equipment  
Holdings [Line Items]  
Percent of Total Investments 16.20%
C000065074 | Semiconductors  
Holdings [Line Items]  
Percent of Total Investments 14.40%
C000065074 | Semiconductor Materials & Equipment  
Holdings [Line Items]  
Percent of Total Investments 6.60%
C000065074 | Oil & Gas Refining & Marketing  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000065074 | Independent Power Producers & Energy Traders  
Holdings [Line Items]  
Percent of Total Investments 0.50%
C000065074 | Steel  
Holdings [Line Items]  
Percent of Total Investments 0.30%
C000065074 | Industrial Machinery & Supplies & Components  
Holdings [Line Items]  
Percent of Total Investments 0.10%
C000065074 | Germany  
Holdings [Line Items]  
Percent of Total Investments 1.50%
C000065074 | United States  
Holdings [Line Items]  
Percent of Total Investments 42.40%
C000065074 | China  
Holdings [Line Items]  
Percent of Total Investments 21.00%
C000065074 | Brazil  
Holdings [Line Items]  
Percent of Total Investments 6.30%
C000065074 | India  
Holdings [Line Items]  
Percent of Total Investments 6.00%
C000065074 | Denmark  
Holdings [Line Items]  
Percent of Total Investments 5.20%
C000065074 | Portugal  
Holdings [Line Items]  
Percent of Total Investments 3.30%
C000065074 | Israel  
Holdings [Line Items]  
Percent of Total Investments 2.50%
C000065074 | Japan  
Holdings [Line Items]  
Percent of Total Investments 2.30%
C000065074 | South Korea  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000237280 | Other RowHotel & Resort REITs  
Holdings [Line Items]  
Percent of Total Investments 9.60%
C000237280 | Other RowReal Estate  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000237280 | Retail REITs  
Holdings [Line Items]  
Percent of Total Investments 18.10%
C000237280 | Industrial REITs  
Holdings [Line Items]  
Percent of Total Investments 14.10%
C000237280 | Health Care REITs  
Holdings [Line Items]  
Percent of Total Investments 11.90%
C000237280 | Data Center REITs  
Holdings [Line Items]  
Percent of Total Investments 7.40%
C000237280 | Real Estate Operating Companies  
Holdings [Line Items]  
Percent of Total Investments 7.30%
C000237280 | Multi-Family Residential REITs  
Holdings [Line Items]  
Percent of Total Investments 7.10%
C000237280 | Diversified REITs  
Holdings [Line Items]  
Percent of Total Investments 7.00%
C000237280 | Diversified Real Estate Activities  
Holdings [Line Items]  
Percent of Total Investments 6.70%
C000237280 | Office REITs  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000237280 | Self-Storage REITs  
Holdings [Line Items]  
Percent of Total Investments 5.00%
C000237280 | United Kingdom  
Holdings [Line Items]  
Percent of Total Investments 3.40%
C000237280 | France  
Holdings [Line Items]  
Percent of Total Investments 2.00%
C000237280 | Hong Kong  
Holdings [Line Items]  
Percent of Total Investments 3.70%
C000237280 | Canada  
Holdings [Line Items]  
Percent of Total Investments 1.90%
C000237280 | Sweden  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000237280 | United States  
Holdings [Line Items]  
Percent of Total Investments 61.90%
C000237280 | Japan  
Holdings [Line Items]  
Percent of Total Investments 11.10%
C000237280 | Australia  
Holdings [Line Items]  
Percent of Total Investments 5.40%
C000237280 | Singapore  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000237280 | Switzerland  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000141932 | Other RowHotel & Resort REITs  
Holdings [Line Items]  
Percent of Total Investments 2.40%
C000141932 | Other RowReal Estate  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000141932 | Retail REITs  
Holdings [Line Items]  
Percent of Total Investments 19.10%
C000141932 | Industrial REITs  
Holdings [Line Items]  
Percent of Total Investments 17.70%
C000141932 | Health Care REITs  
Holdings [Line Items]  
Percent of Total Investments 15.60%
C000141932 | Data Center REITs  
Holdings [Line Items]  
Percent of Total Investments 10.10%
C000141932 | Multi-Family Residential REITs  
Holdings [Line Items]  
Percent of Total Investments 7.80%
C000141932 | Diversified REITs  
Holdings [Line Items]  
Percent of Total Investments 8.30%
C000141932 | Office REITs  
Holdings [Line Items]  
Percent of Total Investments 5.20%
C000141932 | Self-Storage REITs  
Holdings [Line Items]  
Percent of Total Investments 5.50%
C000141932 | Other Specialized REITs  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000141932 | Single-Family Residential REITs  
Holdings [Line Items]  
Percent of Total Investments 3.20%
C000141932 | United Kingdom  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000141932 | France  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000141932 | Hong Kong  
Holdings [Line Items]  
Percent of Total Investments 0.80%
C000141932 | Canada  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000141932 | United States  
Holdings [Line Items]  
Percent of Total Investments 72.60%
C000141932 | Japan  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000141932 | Australia  
Holdings [Line Items]  
Percent of Total Investments 6.20%
C000141932 | Singapore  
Holdings [Line Items]  
Percent of Total Investments 2.80%
C000141932 | Belgium  
Holdings [Line Items]  
Percent of Total Investments 1.10%
C000141932 | Mexico  
Holdings [Line Items]  
Percent of Total Investments 0.80%
C000050169 | Other RowReal Estate  
Holdings [Line Items]  
Percent of Total Investments 7.50%
C000050169 | Other RowSelf-Storage REITs  
Holdings [Line Items]  
Percent of Total Investments 3.50%
C000050169 | Retail REITs  
Holdings [Line Items]  
Percent of Total Investments 14.70%
C000050169 | Industrial REITs  
Holdings [Line Items]  
Percent of Total Investments 16.40%
C000050169 | Health Care REITs  
Holdings [Line Items]  
Percent of Total Investments 2.10%
C000050169 | Real Estate Operating Companies  
Holdings [Line Items]  
Percent of Total Investments 18.70%
C000050169 | Multi-Family Residential REITs  
Holdings [Line Items]  
Percent of Total Investments 3.60%
C000050169 | Diversified REITs  
Holdings [Line Items]  
Percent of Total Investments 14.30%
C000050169 | Diversified Real Estate Activities  
Holdings [Line Items]  
Percent of Total Investments 17.10%
C000050169 | Office REITs  
Holdings [Line Items]  
Percent of Total Investments 6.60%
C000050169 | Real Estate Development  
Holdings [Line Items]  
Percent of Total Investments 1.70%
C000050169 | Hotel & Resort REITs  
Holdings [Line Items]  
Percent of Total Investments 1.30%
C000050169 | United Kingdom  
Holdings [Line Items]  
Percent of Total Investments 8.70%
C000050169 | France  
Holdings [Line Items]  
Percent of Total Investments 5.10%
C000050169 | Germany  
Holdings [Line Items]  
Percent of Total Investments 4.40%
C000050169 | Hong Kong  
Holdings [Line Items]  
Percent of Total Investments 9.50%
C000050169 | Canada  
Holdings [Line Items]  
Percent of Total Investments 5.80%
C000050169 | Sweden  
Holdings [Line Items]  
Percent of Total Investments 4.50%
C000050169 | Japan  
Holdings [Line Items]  
Percent of Total Investments 25.20%
C000050169 | Australia  
Holdings [Line Items]  
Percent of Total Investments 16.40%
C000050169 | Singapore  
Holdings [Line Items]  
Percent of Total Investments 8.40%
C000050169 | Switzerland  
Holdings [Line Items]  
Percent of Total Investments 4.50%
[1] Rounds to less than 0.1%.
[2] Rounds to less than 0.1%.