| Form N-CSR Cover | 6 Months Ended |
| Oct. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | iShares Trust |
| Entity Central Index Key | 0001100663 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| Shareholder Report | 6 Months Ended |
| Oct. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSRS |
| Amendment Flag | false |
| Registrant Name | iShares Trust |
| Entity Central Index Key | 0001100663 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Oct. 31, 2024 |
| C000012079 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Cohen & Steers REIT ETF |
| Trading Symbol | ICF |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Cohen & Steers REIT ETF (the “Fund”) for the period of May 1, 2024 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Cohen & Steers REIT ETF $18 0.32% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 18 |
| Expense Ratio, Percent | 0.32% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. |
| Average Annual Return [Table Text Block] | Average Annual Total Returns 6-Month Total Returns 1 Year 5 Years 10 Years Fund NAV ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.22 % 33.90 % 3.83 % 6.17 % S&P Total Market Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 13.84 37.99 14.51 12.37 Cohen & Steers Realty Majors Index ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 21.45 34.40 4.22 6.55 |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 2,172,864,480 |
| Holdings Count | Holding | 33 |
| InvestmentCompanyPortfolioTurnover | 12% |
| Additional Fund Statistics [Text Block] | Key Fund statistics Net Assets ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ $2,172,864,480 Number of Portfolio Holdings ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 33 Portfolio Turnover Rate ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 12% |
| Holdings [Text Block] | Industry allocation Ten largest holdings Industry Percent of TotaI Investments Footnote Reference Specialized REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 45.3 % Residential REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 19.0 Retail REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 14.3 Health Care REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 9.9 Industrial REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.3 Hotel & Resort REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Office REITs ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 1.6 Security Percent of Total Investments Footnote Reference Equinix, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 8.4 % Welltower, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.9 Prologis, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.1 American Tower Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 7.1 Realty Income Corp. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 5.1 Digital Realty Trust, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.9 Public Storage ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Simon Property Group, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Crown Castle, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.6 Iron Mountain, Inc. ........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................ 4.0 Footnote Description Footnote (a) Excludes money market funds. |
| C000012098 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Morningstar Growth ETF |
| Trading Symbol | ILCG |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Morningstar Growth ETF (the “Fund”) for the period of May 1, 2024 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Morningstar Growth ETF $2 0.04% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 2,331,511,311 |
| Holdings Count | Holding | 392 |
| InvestmentCompanyPortfolioTurnover | 13% |
| C000012101 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Morningstar Mid-Cap ETF |
| Trading Symbol | IMCB |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Morningstar Mid-Cap ETF (the “Fund”) for the period of May 1, 2024 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Morningstar Mid-Cap ETF $2 0.04% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 2 |
| Expense Ratio, Percent | 0.04% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 988,795,174 |
| Holdings Count | Holding | 453 |
| InvestmentCompanyPortfolioTurnover | 9% |
| C000012193 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Morningstar Mid-Cap Growth ETF |
| Trading Symbol | IMCG |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Morningstar Mid-Cap Growth ETF (the “Fund”) for the period of May 1, 2024 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Morningstar Mid-Cap Growth ETF $3 0.06% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.06% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 2,213,233,244 |
| Holdings Count | Holding | 305 |
| InvestmentCompanyPortfolioTurnover | 18% |
| C000012197 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Morningstar Small-Cap Growth ETF |
| Trading Symbol | ISCG |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Morningstar Small-Cap Growth ETF (the “Fund”) for the period of May 1, 2024 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Morningstar Small-Cap Growth ETF $3 0.06% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.06% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 610,306,786 |
| Holdings Count | Holding | 996 |
| InvestmentCompanyPortfolioTurnover | 20% |
| C000012198 | |
| Shareholder Report [Line Items] | |
| Fund Name | iShares Morningstar Small-Cap Value ETF |
| Trading Symbol | ISCV |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | This semi-annual shareholder report contains important information about iShares Morningstar Small-Cap Value ETF (the “Fund”) for the period of May 1, 2024 to October 31, 2024. |
| Shareholder Report Annual or Semi-Annual | Semi-Annual Shareholder Report |
| Additional Information [Text Block] | You can find additional information about the Fund at blackrock.com/fundreports |
| Additional Information Phone Number | 1-800-iShares (1-800-474-2737) |
| Additional Information Website | blackrock.com/fundreports |
| Expenses [Text Block] | What were the Fund costs for the last six months? (based on a hypothetical $10,000 investment) Fund name Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment iShares Morningstar Small-Cap Value ETF $3 0.06% Footnote Reference Footnote Description Footnote (a) Annualized. |
| Expenses Paid, Amount | $ 3 |
| Expense Ratio, Percent | 0.06% |
| Performance Past Does Not Indicate Future [Text] | Past performance is not an indication of future results. |
| No Deduction of Taxes [Text Block] | Performance results do not reflect the deduction of taxes that a shareholder would pay on fund distributions or on the redemption or sale of fund shares. |
| Updated Performance Information Location [Text Block] | Visit iShares.com |
| AssetsNet | $ 427,678,996 |
| Holdings Count | Holding | 1,122 |
| InvestmentCompanyPortfolioTurnover | 17% |
| Shareholder Report, Line Graph (Details) | 6 Months Ended |
| Oct. 31, 2024 | |
| FR Notes - Benchmark total return 6 months w/o sales charge | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | S&P Total Market Index |
| FR Notes - Benchmark total return 6 months w/o sales charge | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar US Market Index |
| FR Notes - Benchmark total return 6 months w/o sales charge | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar US Market Index |
| FR Notes - Benchmark total return 6 months w/o sales charge | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar US Market Index |
| FR Notes - Benchmark total return 6 months w/o sales charge | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar US Market Index |
| FR Notes - Benchmark total return 6 months w/o sales charge | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar US Market Index |
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Cohen & Steers Realty Majors Index |
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Large-Mid Cap Broad Growth Index℠ |
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Mid Cap Index℠ |
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Mid Cap Broad Growth Index℠ |
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Small Cap Broad Growth Extended Index℠ |
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | |
| Account Value [Line Items] | |
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Small Cap Broad Value Extended Index℠ |
| Shareholder Report, Average Annual Return (Details) | 6 Months Ended | 12 Months Ended | 60 Months Ended | 120 Months Ended |
| Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | Oct. 31, 2024 | |
| Without Sales Load [Member] | C000012079 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 21.22% | 33.90% | 3.83% | 6.17% |
| Without Sales Load [Member] | C000012098 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 16.23% | 44% | 17.19% | 14.98% |
| Without Sales Load [Member] | C000012101 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 10.05% | 34.67% | 10.07% | 9.37% |
| Without Sales Load [Member] | C000012193 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 9.80% | 35.91% | 12.81% | 11.63% |
| Without Sales Load [Member] | C000012197 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.99% | 35.88% | 8.58% | 8.87% |
| Without Sales Load [Member] | C000012198 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.29% | 32.14% | 9.24% | 6.57% |
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | S&P Total Market Index | |||
| Average Annual Return, Percent | 13.84% | |||
| FR Notes - Benchmark total return 1 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 37.99% | |||
| FR Notes - Benchmark total return 5 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.51% | |||
| FR Notes - Benchmark total return inception w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.37% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar US Market Index | |||
| Average Annual Return, Percent | 13.83% | |||
| FR Notes - Benchmark total return 1 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 38.09% | |||
| FR Notes - Benchmark total return 5 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.70% | |||
| FR Notes - Benchmark total return inception w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.56% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar US Market Index | |||
| Average Annual Return, Percent | 13.83% | |||
| FR Notes - Benchmark total return 1 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 38.09% | |||
| FR Notes - Benchmark total return 5 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.70% | |||
| FR Notes - Benchmark total return inception w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.56% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar US Market Index | |||
| Average Annual Return, Percent | 13.83% | |||
| FR Notes - Benchmark total return 1 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 38.09% | |||
| FR Notes - Benchmark total return 5 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.70% | |||
| FR Notes - Benchmark total return inception w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.56% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar US Market Index | |||
| Average Annual Return, Percent | 13.83% | |||
| FR Notes - Benchmark total return 1 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 38.09% | |||
| FR Notes - Benchmark total return 5 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.70% | |||
| FR Notes - Benchmark total return inception w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.56% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar US Market Index | |||
| Average Annual Return, Percent | 13.83% | |||
| FR Notes - Benchmark total return 1 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 38.09% | |||
| FR Notes - Benchmark total return 5 year | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 14.70% | |||
| FR Notes - Benchmark total return inception w/o sales charge | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.56% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Cohen & Steers Realty Majors Index | |||
| Average Annual Return, Percent | 21.45% | |||
| FR Notes - Benchmark total return 1 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 34.40% | |||
| FR Notes - Benchmark total return 5 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 4.22% | |||
| FR Notes - Benchmark total return 10 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 6.55% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Large-Mid Cap Broad Growth Index℠ | |||
| Average Annual Return, Percent | 16.26% | |||
| FR Notes - Benchmark total return 1 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 44.03% | |||
| FR Notes - Benchmark total return 5 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 17.29% | |||
| FR Notes - Benchmark total return 10 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 15.25% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Mid Cap Index℠ | |||
| Average Annual Return, Percent | 10.06% | |||
| FR Notes - Benchmark total return 1 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 34.69% | |||
| FR Notes - Benchmark total return 5 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 10.16% | |||
| FR Notes - Benchmark total return 10 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 9.55% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Mid Cap Broad Growth Index℠ | |||
| Average Annual Return, Percent | 9.82% | |||
| FR Notes - Benchmark total return 1 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 35.97% | |||
| FR Notes - Benchmark total return 5 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 12.95% | |||
| FR Notes - Benchmark total return 10 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 11.82% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Small Cap Broad Growth Extended Index℠ | |||
| Average Annual Return, Percent | 11.96% | |||
| FR Notes - Benchmark total return 1 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 35.81% | |||
| FR Notes - Benchmark total return 5 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.56% | |||
| FR Notes - Benchmark total return 10 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.91% | |||
| FR Notes - Benchmark total return 6 months w/o sales charge - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Morningstar<sup>®</sup> US Small Cap Broad Value Extended Index℠ | |||
| Average Annual Return, Percent | 11.35% | |||
| FR Notes - Benchmark total return 1 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 32.26% | |||
| FR Notes - Benchmark total return 5 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 9.33% | |||
| FR Notes - Benchmark total return 10 year - 2 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 6.74% |
| Shareholder Report, Holdings (Details) | Oct. 31, 2024 |
| C000012079 | Equinix, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000012079 | Welltower, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.90% |
| C000012079 | Prologis, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000012079 | American Tower Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.10% |
| C000012079 | Realty Income Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.10% |
| C000012079 | Digital Realty Trust, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.90% |
| C000012079 | Public Storage, , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000012079 | Simon Property Group, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000012079 | Crown Castle, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.60% |
| C000012079 | Iron Mountain, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4% |
| C000012079 | Specialized REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 45.30% |
| C000012079 | Residential REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19% |
| C000012079 | Retail REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.30% |
| C000012079 | Health Care REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000012079 | Industrial REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.30% |
| C000012079 | Hotel & Resort REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000012079 | Office REITs | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000012098 | NVIDIA Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.90% |
| C000012098 | Microsoft Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.40% |
| C000012098 | Amazon.com, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000012098 | Apple, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.60% |
| C000012098 | Meta Platforms, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000012098 | Eli Lilly & Co., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.90% |
| C000012098 | Tesla, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000012098 | Alphabet, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.10% |
| C000012098 | Visa, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000012098 | Alphabet, Inc., C, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000012098 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 46.20% |
| C000012098 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000012098 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.30% |
| C000012098 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000012098 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.80% |
| C000012098 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.70% |
| C000012098 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2% |
| C000012098 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000012098 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000012098 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012098 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000012101 | Digital Realty Trust, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012101 | Palantir Technologies, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000012101 | GE Vernova, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.80% |
| C000012101 | Williams Cos., Inc. (The), , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012101 | Capital One Financial Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012101 | Carrier Global Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012101 | Autodesk, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012101 | Hilton Worldwide Holdings, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012101 | Truist Financial Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012101 | General Motors Co., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012101 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14% |
| C000012101 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.80% |
| C000012101 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3% |
| C000012101 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000012101 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.20% |
| C000012101 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.20% |
| C000012101 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.20% |
| C000012101 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.30% |
| C000012101 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000012101 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000012101 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 7.20% |
| C000012193 | Palantir Technologies, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000012193 | Autodesk, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000012193 | Hilton Worldwide Holdings, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000012193 | Trade Desk, Inc. (The), A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1% |
| C000012193 | AutoZone, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012193 | Fortinet, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012193 | Workday, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012193 | WW Grainger, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012193 | Fair Isaac Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012193 | DoorDash, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012193 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20% |
| C000012193 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000012193 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000012193 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.20% |
| C000012193 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.20% |
| C000012193 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.90% |
| C000012193 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.50% |
| C000012193 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.10% |
| C000012193 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.90% |
| C000012193 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.60% |
| C000012193 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.80% |
| C000012197 | Guidewire Software, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000012197 | Coherent Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012197 | Carvana Co., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012197 | FTAI Aviation Ltd., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012197 | Curtiss-Wright Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012197 | Texas Roadhouse, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012197 | Toast, Inc., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012197 | SoFi Technologies, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012197 | Vaxcyte, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012197 | ITT, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012197 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.40% |
| C000012197 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.70% |
| C000012197 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
| C000012197 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22% |
| C000012197 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.20% |
| C000012197 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.70% |
| C000012197 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.30% |
| C000012197 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.60% |
| C000012197 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.70% |
| C000012197 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.90% |
| C000012197 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000012198 | Carvana Co., A, , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.70% |
| C000012198 | East West Bancorp, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000012198 | CH Robinson Worldwide, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012198 | Tapestry, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012198 | Fortune Brands Innovations, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012198 | Omega Healthcare Investors, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012198 | Stifel Financial Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.50% |
| C000012198 | Assurant, Inc., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000012198 | Pinnacle West Capital Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000012198 | Alcoa Corp., , , 0 | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000012198 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5% |
| C000012198 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 15.60% |
| C000012198 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.40% |
| C000012198 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.80% |
| C000012198 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000012198 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 28.60% |
| C000012198 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.30% |
| C000012198 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000012198 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000012198 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.30% |
| C000012198 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.60% |
