| Form N-CSR Cover | 12 Months Ended |
| Jul. 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Ark ETF Trust |
| Entity Central Index Key | 0001579982 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| Shareholder Report | 12 Months Ended |
| Jul. 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | Ark ETF Trust |
| Entity Central Index Key | 0001579982 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | Jul. 31, 2024 |
| C000133119 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Genomic Revolution ETF |
| Class Name | ARK Genomic Revolution ETF |
| Trading Symbol | ARKG |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B20"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Genomic Revolution ETF $64 0.75% |
| Expenses Paid, Amount | $ 64 |
| Expense Ratio, Percent | 0.75% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” For example, many companies in the genomics space are sacrificing short-term profitability for potential long-term gain. As many of these companies are at an early stage, they are “burning cash” as they invest in ways that we believe will enable them to dominate their spaces. Top contributors to relative performance • The top contributor to performance during the period was Twist Bioscience Corporation (TWST). Shares of TWST rose during the period. The company reported strong fiscal second-quarter 2024 financial results. Revenue increased 25% year-over-year, thanks to growth in the company’s synthetic biology product line, including Express Gene, which they commercialized in 4Q2024. • Additional contributors to performance included CareDx, Inc., Nurix Therapeutics, Inc., Ionis Pharmaceuticals, Inc., and Vertex Pharmaceuticals Incorporated. Biggest detractors from relative performance • The biggest detractor from performance during the period was Pacific Biosciences of California, Inc. (PACB). Shares of PACB traded down during the period after the company preannounced fourth-quarter 2023 results, including better-than-expected sales of sequencers but lower-than-expected pull-through of the more profitable consumables—a short-term mismatch, in our view. • Additional detractors from performance included Ginkgo Bioworks Holdings, Inc., Exact Sciences Corporation, Schrödinger, Inc. and Teladoc Health, Inc. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Genomic Revolution ETF - NAV Nasdaq Healthcare Index MSCI World Index (Net) S&P 500 Index 10/30/14 $10,000 $10,000 $10,000 $10,000 7/31/15 $11,340 $12,110 $10,602 $10,711 7/31/16 $9,370 $9,736 $10,553 $11,312 7/31/17 $11,119 $10,778 $12,254 $13,127 7/31/18 $14,877 $12,263 $13,710 $15,258 7/31/19 $17,833 $11,694 $14,207 $16,477 7/31/20 $28,605 $14,963 $15,234 $18,447 7/31/21 $45,335 $18,356 $20,577 $25,170 7/31/22 $19,825 $12,750 $18,691 $24,003 7/31/23 $20,511 $13,740 $21,211 $27,127 7/31/24 $14,569 $15,072 $25,100 $33,135 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 10/30/2014 ARK Genomic Revolution ETF - NAV - - 3.93% ARK Genomic Revolution ETF - Market - - 3.94% Nasdaq Healthcare Index 9.69% 5.21% 4.30% MSCI World Index (Net) 18.34% 12.06% 9.90% S&P 500 Index 22.15% 15.00% 13.07% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 1,463,401,954 |
| Holdings Count | Holding | 41 |
| Advisory Fees Paid, Amount | $ 12,638,417 |
| InvestmentCompanyPortfolioTurnover | 26% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $1,463,401,954 Total number of portfolio holdings 41 Total advisory fees paid $12,638,417 Period portfolio turnover rate 26% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Health Care 97.7% Information Technology 1.5% Materials 0.6% Financials (Money Market Fund) 0.2% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000133120 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Autonomous Technology & Robotics ETF |
| Class Name | ARK Autonomous Technology & Robotics ETF |
| Trading Symbol | ARKQ |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B47"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Autonomous Technology & Robotics ETF $74 0.75% |
| Expenses Paid, Amount | $ 74 |
| Expense Ratio, Percent | 0.75% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was Kratos Defense & Security Solutions, Inc. (KTOS). Shares of KTOS contributed to performance during the period in response to the acquisition of Sierra Technical Services, Inc., its autonomous fifth-generation fighter developer. Additionally, they highlighted several AI initiatives, such as the integration of Shield AI’s artificial intelligence pilot into its Valkyrie drone. • Additional contributors to performance included AeroVironment, Inc., NVIDIA Corporation, Teradyne, Inc., and Taiwan Semiconductor Manufacturing Company Limited. Biggest detractors from relative performance • The biggest detractor from performance during the period was Iridium Communications Inc. (IRDM). Shares of IRDM traded down as the company has seen increased competition from Starlink in its Maritime segment. • Additional detractors from performance included Markforged Holdings Corporation, Archer Aviation Inc., Unity Software Inc., and Velo3D, Inc. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Autonomous Technology & Robotics ETF - NAV MSCI World Index (Net) S&P 500 Index Nasdaq Industrials Index 9/29/14 $10,000 $10,000 $10,000 $10,000 7/31/15 $9,730 $10,530 $10,815 $11,599 7/31/16 $10,479 $10,481 $11,423 $11,936 7/31/17 $14,937 $12,171 $13,255 $14,200 7/31/18 $17,903 $13,616 $15,408 $16,948 7/31/19 $17,427 $14,109 $16,638 $18,020 7/31/20 $27,784 $15,130 $18,628 $22,962 7/31/21 $43,151 $20,436 $25,416 $29,699 7/31/22 $30,086 $18,564 $24,237 $25,160 7/31/23 $31,544 $21,066 $27,392 $26,077 7/31/24 $30,328 $24,929 $33,459 $27,895 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 9/29/2014 ARK Autonomous Technology & Robotics ETF - NAV - 11.72% 11.94% ARK Autonomous Technology & Robotics ETF - Market - 11.70% 11.94% MSCI World Index (Net) 18.34% 12.06% 9.73% S&P 500 Index 22.15% 15.00% 13.06% Nasdaq Industrials Index 6.97% 9.13% 10.99% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 791,819,829 |
| Holdings Count | Holding | 37 |
| Advisory Fees Paid, Amount | $ 6,997,809 |
| InvestmentCompanyPortfolioTurnover | 20% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $791,819,829 Total number of portfolio holdings 37 Total advisory fees paid $6,997,809 Period portfolio turnover rate 20% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Industrials 35.8% Information Technology 35.2% Consumer Discretionary 16.4% Communication Services 8.4% Health Care 1.6% Energy 1.3% Utilities 1.1% Financials (Money Market Fund) 0.2% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000133121 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Innovation ETF |
| Class Name | ARK Innovation ETF |
| Trading Symbol | ARKK |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B74"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Innovation ETF $71 0.75% |
| Expenses Paid, Amount | $ 71 |
| Expense Ratio, Percent | 0.75% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was Coinbase Global, Inc. (COIN or Coinbase). Shares of COIN rallied along with the broad crypto asset market. Coinbase also received positive news in its legal battle with the U.S. Securities and Exchange Commission (SEC) as the court dismissed the SEC’s charges against Coinbase Wallet, its self-custody solution – a significant win for Coinbase and for decentralized financial services in the US broadly. • Additional contributors to performance included Robinhood Markets, Inc., Twist Bioscience Corporation, Palantir Technologies Inc., and Roblox Corporation. Biggest detractors from relative performance • The biggest detractor from performance during the period was Unity Software Inc. (U). Shares of U traded down after the company reported mixed fourth-quarter 2024 results, guiding to 3% year-over-year revenue growth at midpoint for the full year 2024, well below Wall Street estimates of 9%. • Additional detractors from performance included Ginkgo Bioworks Holdings, Inc., Roku, Inc., Teladoc Health, Inc., and Pacific Biosciences of California, Inc. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Innovation ETF - NAV MSCI World Index (Net) S&P 500 Index 10/30/14 $10,000 $10,000 $10,000 7/31/15 $10,725 $10,602 $10,711 7/31/16 $10,540 $10,553 $11,312 7/31/17 $15,126 $12,254 $13,127 7/31/18 $23,047 $13,710 $15,258 7/31/19 $25,847 $14,207 $16,477 7/31/20 $43,118 $15,234 $18,447 7/31/21 $65,387 $20,577 $25,170 7/31/22 $24,819 $18,691 $24,003 7/31/23 $27,725 $21,211 $27,127 7/31/24 $25,021 $25,100 $33,135 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 10/30/2014 ARK Innovation ETF - NAV - - 9.86% ARK Innovation ETF - Market - - 9.88% MSCI World Index (Net) 18.34% 12.06% 9.90% S&P 500 Index 22.15% 15.00% 13.07% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 5,965,698,028 |
| Holdings Count | Holding | 34 |
| Advisory Fees Paid, Amount | $ 54,966,688 |
| InvestmentCompanyPortfolioTurnover | 39% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $5,965,698,028 Total number of portfolio holdings 34 Total advisory fees paid $54,966,688 Period portfolio turnover rate 39% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Health Care 24.1% Communication Services 20.1% Financials 19.1% Information Technology 18.9% Consumer Discretionary 16.4% Industrials 1.1% Financials (Money Market Fund) 0.3% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000133122 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Next Generation Internet ETF |
| Class Name | ARK Next Generation Internet ETF |
| Trading Symbol | ARKW |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B101"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Next Generation Internet ETF $81 0.75% |
| Expenses Paid, Amount | $ 81 |
| Expense Ratio, Percent | 0.75% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was Coinbase Global, Inc. (COIN or Coinbase). Shares of COIN rallied along with the broad crypto asset market. Coinbase also received positive news in its legal battle with the U.S. Securities and Exchange Commission (SEC) as the court dismissed the SEC’s charges against Coinbase Wallet, its self-custody solution – a significant win for Coinbase and for decentralized financial services in the US broadly. • Additional contributors to performance included Grayscale Bitcoin Trust, ARK 21Shares Bitcoin ETF, Robinhood Markets, Inc., and Spotify Technologies SA. Biggest detractors from relative performance • The biggest detractor from performance during the period was Unity Software Inc. (U). Shares of U traded down after the company reported mixed fourth-quarter 2024 results, guiding to 3% year-over-year revenue growth at midpoint for the full year 2024, well below Wall Street estimates of 9%. • Additional detractors from performance included Roku, Inc., Teladoc Health, Inc., Block, Inc., and Zoom Video Communications, Inc. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Next Generation Internet ETF - NAV S&P 500 Index MSCI World Index (Net) 9/29/14 $10,000 $10,000 $10,000 7/31/15 $11,845 $10,815 $10,530 7/31/16 $12,371 $11,423 $10,481 7/31/17 $18,829 $13,255 $12,171 7/31/18 $28,754 $15,408 $13,616 7/31/19 $30,907 $16,638 $14,109 7/31/20 $58,763 $18,628 $15,130 7/31/21 $88,184 $25,416 $20,436 7/31/22 $33,560 $24,237 $18,564 7/31/23 $41,361 $27,392 $21,066 7/31/24 $48,193 $33,459 $24,929 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 9/29/2014 ARK Next Generation Internet ETF - NAV 16.52% 9.29% 17.34% ARK Next Generation Internet ETF - Market 15.57% 9.07% 17.26% S&P 500 Index 22.15% 15.00% 13.06% MSCI World Index (Net) 18.34% 12.06% 9.73% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 1,394,382,172 |
| Holdings Count | Holding | 42 |
| Advisory Fees Paid, Amount | $ 11,264,165 |
| InvestmentCompanyPortfolioTurnover | 54% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $1,394,382,172 Total number of portfolio holdings 42 Total advisory fees paid $11,264,165 Period portfolio turnover rate 54% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Financials 32.3% Communication Services 25.6% Information Technology 24.6% Consumer Discretionary 17.1% Health Care 0.4% Financials (Money Market Fund) 0.0% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000209702 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Fintech Innovation ETF |
| Class Name | ARK Fintech Innovation ETF |
| Trading Symbol | ARKF |
| Security Exchange Name | NYSEArca |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B128"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Fintech Innovation ETF $80 0.75% |
| Expenses Paid, Amount | $ 80 |
| Expense Ratio, Percent | 0.75% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was Coinbase Global, Inc. (COIN or Coinbase). Shares of COIN rallied along with the broad crypto asset market. Coinbase also received positive news in its legal battle with the U.S. Securities and Exchange Commission (SEC) as the court dismissed the SEC’s charges against Coinbase Wallet, its self-custody solution – a significant win for Coinbase and for decentralized financial services in the US broadly. • Additional contributors to performance included Robinhood Markets, Inc., DraftKings Inc., NVIDIA Corporation, and Mercado Libre, Inc. Biggest detractors from relative performance • The biggest detractor from performance during the period was Bill Holdings, Inc. (Bill Holdings). While total revenue for Bill Holdings surpassed consensus expectations during the third quarter of 2023, management guidance missed expectations. Management cited continued macroeconomic pressure as customers cut back on spending and opted for lower-cost payment methods at the expense of payment speed. • Additional detractors from performance included Block, Inc., Teladoc Health, Inc., Global-E Online Ltd., and Roku, Inc. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Fintech Innovation ETF - NAV MSCI World Index (Net) S&P 500 Index 2/1/19 $10,000 $10,000 $10,000 7/31/19 $11,421 $10,901 $11,121 7/31/20 $18,314 $11,689 $12,450 7/31/21 $25,746 $15,789 $16,988 7/31/22 $9,098 $14,342 $16,200 7/31/23 $12,275 $16,276 $18,308 7/31/24 $13,843 $19,260 $22,363 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 2/1/2019 ARK Fintech Innovation ETF - NAV 12.78% 3.92% 6.10% ARK Fintech Innovation ETF - Market 12.48% 3.89% 6.08% MSCI World Index (Net) 18.34% 12.06% 12.67% S&P 500 Index 22.15% 15.00% 15.78% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 828,213,651 |
| Holdings Count | Holding | 33 |
| Advisory Fees Paid, Amount | $ 7,305,551 |
| InvestmentCompanyPortfolioTurnover | 37% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $828,213,651 Total number of portfolio holdings 33 Total advisory fees paid $7,305,551 Period portfolio turnover rate 37% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Financials 49.2% Information Technology 20.7% Communication Services 18.3% Consumer Discretionary 10.9% Real Estate 0.9% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000226276 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Space Exploration & Innovation ETF |
| Class Name | ARK Space Exploration & Innovation ETF |
| Trading Symbol | ARKX |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B155"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Space Exploration & Innovation ETF $72 0.72% |
| Expenses Paid, Amount | $ 72 |
| Expense Ratio, Percent | 0.72% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was AeroVironment, Inc. (AVAV or AeroVironment). Shares of AVAV traded up as part of a broad market rally for defense companies. The U.S. Department of Defense’s Replicator Initiative selected AeroVironment’s Switchblade 600 loitering munitions system (LMS). • Additional contributors to performance included Kratos Defense & Security Solutions, Inc., Garmin Ltd, Amazon.com, Inc., and L3Harris Technologies, Inc. Biggest detractors from relative performance • The biggest detractor from performance during the period was Iridium Communications Inc. (IRDM). Shares of IRDM traded down as the company has seen increased competition from Starlink in its Maritime segment. • Additional detractors from performance included Markforged Holdings Corporation, Archer Aviation, Inc., Velo3D, Inc., and Unity Software Inc. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Space Exploration & Innovation ETF - NAV MSCI World Index (Net) S&P 500 Index 3/30/21 $10,000 $10,000 $10,000 7/31/21 $10,177 $10,994 $11,154 7/31/22 $7,466 $9,986 $10,636 7/31/23 $7,785 $11,333 $12,021 7/31/24 $7,643 $13,411 $14,683 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year Since Inception 3/30/2021 ARK Space Exploration & Innovation ETF - NAV - - ARK Space Exploration & Innovation ETF - Market - - MSCI World Index (Net) 18.34% 9.19% S&P 500 Index 22.15% 12.20% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 226,236,023 |
| Holdings Count | Holding | 35 |
| Advisory Fees Paid, Amount | $ 1,892,246 |
| InvestmentCompanyPortfolioTurnover | 18% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $226,236,023 Total number of portfolio holdings 35 Total advisory fees paid $1,892,246 Period portfolio turnover rate 18% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Industrials 55.0% Information Technology 24.4% Communication Services 11.0% Consumer Discretionary 6.5% Equity Fund 2.8% Financials (Money Market Fund) 0.3% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000164426 | |
| Shareholder Report [Line Items] | |
| Fund Name | The 3D Printing ETF |
| Class Name | The 3D Printing ETF |
| Trading Symbol | PRNT |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B182"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK The 3D Printing ETF $61 0.66% |
| Expenses Paid, Amount | $ 61 |
| Expense Ratio, Percent | 0.66% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was General Electric Company (General Electric). After facing supply chain issues in 2022, General Electric saw improvements in 2023. Additionally, the spinoff of GE Vernova was well received by the market. • Additional contributors to performance included Moog Inc., BICO Group AB, HP Inc., and Altair Engineering Inc. Biggest detractors from relative performance • The biggest detractor from performance during the period was Markforged Holding Corporation (MKFG or Markforged). Shares of MKFG declined after a federal jury determined that the company must pay $17.34 million to Continuous Composites for patent infringement. Markforged is looking to overturn the verdict. • Additional detractors from performance included Velo3D, Inc., Desktop Metal, Inc., 3D Systems Corporation, and Stratasys Ltd. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | The 3D Printing ETF - NAV The Total 3-D Printing Index MSCI World Index (Net) S&P 500 Index 7/18/16 $10,000 $10,000 $10,000 $10,000 7/31/16 $10,015 $10,022 $10,107 $10,034 7/31/17 $12,760 $12,976 $11,736 $11,644 7/31/18 $12,371 $12,653 $13,131 $13,535 7/31/19 $11,351 $11,717 $13,606 $14,616 7/31/20 $11,482 $11,963 $14,590 $16,364 7/31/21 $19,607 $20,433 $19,707 $22,328 7/31/22 $11,934 $12,554 $17,901 $21,292 7/31/23 $12,603 $13,154 $20,315 $24,063 7/31/24 $10,647 $11,189 $24,040 $29,392 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 7/18/2016 The 3D Printing ETF - NAV - - 0.78% The 3D Printing ETF - Market - - 0.76% The Total 3-D Printing Index - - 1.41% MSCI World Index (Net) 18.34% 12.06% 11.53% S&P 500 Index 22.15% 15.00% 14.36% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 105,353,682 |
| Holdings Count | Holding | 53 |
| Advisory Fees Paid, Amount | $ 882,346 |
| InvestmentCompanyPortfolioTurnover | 39% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $105,353,682 Total number of portfolio holdings 53 Total advisory fees paid $882,346 Period portfolio turnover rate 39% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Information Technology 41.6% Industrials 36.9% Health Care 13.2% Consumer Discretionary 5.9% Materials 2.4% Consumer Staples 0.1% Total 100.0% |
| Material Fund Change [Text Block] | |
| C000164427 | |
| Shareholder Report [Line Items] | |
| Fund Name | ARK Israel Innovative Technology ETF |
| Class Name | ARK Israel Innovative Technology ETF |
| Trading Symbol | IZRL |
| Security Exchange Name | CboeBZX |
| Annual or Semi-Annual Statement [Text Block] | ANNUAL SHAREHOLDER REPORT |
| Shareholder Report Annual or Semi-Annual | annual shareholder report |
| Additional Information [Text Block] | You can find additional information about the Fund at https://www.arkfunds.com/download-fund-materials/ |
| Additional Information Phone Number | (727) 810-8160 |
| Additional Information Website | https://www.arkfunds.com/download-fund-materials/</span>" id="sjs-B209"><span style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 400; grid-area: auto; line-height: 18px; margin: 0px; overflow: visible; text-align: left;">https://www.arkfunds.com/download-fund-materials/</span> |
| Expenses [Text Block] | What were the Fund’s cost for the period? (based on a hypothetical $10,000 investment) Fund Costs of a $10,000 investment Costs paid as a percentage of a $10,000 investment ARK Israel Innovative Technology ETF $49 0.49% |
| Expenses Paid, Amount | $ 49 |
| Expense Ratio, Percent | 0.49% |
| Factors Affecting Performance [Text Block] | Management’s Discussion of Fund Performance SUMMARY OF RESULTS The Fund underperformed both the S&P 500 Index and the MSCI World Index for the 12-month period ending July 31, 2024. As 2024 began, markets anticipated lower interest rates that would favor long-duration assets. However, the Federal Reserve shifted its stance to “higher for longer.” As a result, equity markets became increasingly concentrated, with investors gravitating towards the cash-rich "Magnificent Six" stocks—Apple, Microsoft, Amazon, Alphabet, Meta Platforms, and NVIDIA—where the fund holds minimal exposure. In our view, having already paid dues with tight money and higher interest rates in this cycle, the next few years could prove fertile for a broad swath of the equity market beyond the “Magnificent Six.” Our research indicates that many names underrepresented in the broad-based benchmarks will likely drive value creation over our investment horizon. Top contributors to relative performance • The top contributor to performance during the period was Camtek Ltd (CAMT or Camtek). Shares of CAMT appreciated after announcing its acquisition of FormFactor’s FRT Metrology unit. Camtek is a developer and manufacturer of high-end inspection and metrology equipment for the semiconductor industry. • Additional contributors to performance included Teva Pharmaceuticals Industries Limited, WalkMe Ltd., Cellebrite DI Ltd., and WIX.com Ltd. Biggest detractors from relative performance • The biggest detractor from performance during the period was Gamida Cell Ltd (Gamida Cell). Gamida Cell underwent a major restructuring, which involved delisting from the NASDAQ and moving to the OTC market, which often reduced investor confidence. • Additional detractors from performance included Perion Network Ltd., UroGen Pharma Ltd., Inmode Ltd., and Stratasys Ltd. |
| Performance Past Does Not Indicate Future [Text] | Past performance does not guarantee future results. |
| Line Graph [Table Text Block] | ARK Israel Innovative Technology ETF - NAV ARK Israeli Innovation Index MSCI World Index (Net) S&P 500 Index 12/4/17 $10,000 $10,000 $10,000 $10,000 7/31/18 $10,427 $10,420 $10,534 $10,798 7/31/19 $10,591 $10,600 $10,915 $11,660 7/31/20 $13,165 $13,515 $11,705 $13,054 7/31/21 $15,937 $16,663 $15,810 $17,812 7/31/22 $10,233 $10,805 $14,361 $16,986 7/31/23 $10,614 $11,227 $16,297 $19,196 7/31/24 $10,591 $11,264 $19,285 $23,448 |
| Average Annual Return [Table Text Block] | AVERAGE ANNUAL TOTAL RETURNS 1 Year 5 years Since Inception 12/4/2017 ARK Israel Innovative Technology ETF - NAV - 0.00 0.87% ARK Israel Innovative Technology ETF - Market - - 0.82% ARK Israeli Innovation Index 0.33% 1.22% 1.80% MSCI World Index (Net) 18.34% 12.06% 10.37% S&P 500 Index 22.15% 15.00% 13.66% |
| No Deduction of Taxes [Text Block] | The returns for the Fund do not reflect the deduction of taxes that a shareholder would pay on Fund distributions or upon sale of Fund shares. |
| Updated Performance Information Location [Text Block] | To obtain performance information current to the most recent month end, please visit www.arkfunds.com. |
| AssetsNet | $ 99,212,894 |
| Holdings Count | Holding | 50 |
| Advisory Fees Paid, Amount | $ 472,715 |
| InvestmentCompanyPortfolioTurnover | 43% |
| Additional Fund Statistics [Text Block] | Fund Statistics The following table outlines key Fund statistics that you should pay attention to: Fund net assets $99,212,894 Total number of portfolio holdings 50 Total advisory fees paid $472,715 Period portfolio turnover rate 43% |
| Holdings [Text Block] | The table below shows the investment makeup of the Fund. The allocations may not be representative of the Fund's future investments. Sector Diversification % of Total Investments Information Technology 57.6% Health Care 12.6% Industrials 12.2% Communication Services 12.0% Consumer Discretionary 5.5% Financials (Money Market Fund) 0.1% Total 100.0% |
| Material Fund Change [Text Block] |
| Shareholder Report, Line Graph (Details) - USD ($) | Mar. 30, 2021 | Feb. 01, 2019 | Dec. 04, 2017 | Jul. 18, 2016 | Oct. 30, 2014 | Sep. 29, 2014 | Jul. 31, 2024 | Jul. 31, 2023 | Jul. 31, 2022 | Jul. 31, 2021 | Jul. 31, 2020 | Jul. 31, 2019 | Jul. 31, 2018 | Jul. 31, 2017 | Jul. 31, 2016 | Jul. 31, 2015 |
| C000133119 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Genomic Revolution ETF | |||||||||||||||
| C000133120 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Autonomous Technology & Robotics ETF | |||||||||||||||
| C000133121 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Innovation ETF | |||||||||||||||
| C000133122 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Next Generation Internet ETF | |||||||||||||||
| C000209702 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Fintech Innovation ETF | |||||||||||||||
| C000226276 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Space Exploration & Innovation ETF | |||||||||||||||
| C000164426 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | The 3D Printing ETF | |||||||||||||||
| C000164427 | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Israel Innovative Technology ETF | |||||||||||||||
| Nasdaq Healthcare Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Healthcare Index | |||||||||||||||
| Account Value | $ 10,000 | $ 15,072 | $ 13,740 | $ 12,750 | $ 18,356 | $ 14,963 | $ 11,694 | $ 12,263 | $ 10,778 | $ 9,736 | $ 12,110 | |||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 24,929 | 21,066 | 18,564 | 20,436 | 15,130 | 14,109 | 13,616 | 12,171 | 10,481 | 10,530 | |||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 25,100 | 21,211 | 18,691 | 20,577 | 15,234 | 14,207 | 13,710 | 12,254 | 10,553 | 10,602 | |||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 33,459 | 27,392 | 24,237 | 25,416 | 18,628 | 16,638 | 15,408 | 13,255 | 11,423 | 10,815 | |||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 19,260 | 16,276 | 14,342 | 15,789 | 11,689 | 10,901 | |||||||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 13,411 | 11,333 | 9,986 | 10,994 | |||||||||||
| The Total 3-D Printing Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | The Total 3-D Printing Index | |||||||||||||||
| Account Value | $ 10,000 | 11,189 | 13,154 | 12,554 | 20,433 | 11,963 | 11,717 | 12,653 | 12,976 | 10,022 | ||||||
| ARK Israeli Innovation Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | ARK Israeli Innovation Index | |||||||||||||||
| Account Value | $ 10,000 | 11,264 | 11,227 | 10,805 | 16,663 | 13,515 | 10,600 | 10,420 | ||||||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 25,100 | 21,211 | 18,691 | 20,577 | 15,234 | 14,207 | 13,710 | 12,254 | 10,553 | 10,602 | |||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 33,135 | 27,127 | 24,003 | 25,170 | 18,447 | 16,477 | 15,258 | 13,127 | 11,312 | 10,711 | |||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 33,459 | 27,392 | 24,237 | 25,416 | 18,628 | 16,638 | 15,408 | 13,255 | 11,423 | 10,815 | |||||
| Nasdaq Industrials Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Industrials Index | |||||||||||||||
| Account Value | $ 10,000 | 27,895 | 26,077 | 25,160 | 29,699 | 22,962 | 18,020 | 16,948 | 14,200 | 11,936 | 11,599 | |||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 33,135 | 27,127 | 24,003 | 25,170 | 18,447 | 16,477 | 15,258 | 13,127 | 11,312 | 10,711 | |||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 24,929 | 21,066 | 18,564 | 20,436 | 15,130 | 14,109 | 13,616 | 12,171 | 10,481 | $ 10,530 | |||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 22,363 | 18,308 | 16,200 | 16,988 | 12,450 | 11,121 | |||||||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 14,683 | 12,021 | 10,636 | 11,154 | |||||||||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 24,040 | 20,315 | 17,901 | 19,707 | 14,590 | 13,606 | 13,131 | 11,736 | 10,107 | ||||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | 29,392 | 24,063 | 21,292 | 22,328 | 16,364 | 14,616 | 13,535 | $ 11,644 | $ 10,034 | ||||||
| MSCI World Index (Net) | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||||
| Account Value | $ 10,000 | 19,285 | 16,297 | 14,361 | 15,810 | 11,705 | 10,915 | 10,534 | ||||||||
| S&P 500 Index | ||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||||
| Account Value | $ 10,000 | $ 23,448 | $ 19,196 | $ 16,986 | $ 17,812 | $ 13,054 | $ 11,660 | $ 10,798 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 40 Months Ended | 60 Months Ended | 66 Months Ended | 80 Months Ended | 96 Months Ended | 117 Months Ended | 118 Months Ended | ||||||
| Mar. 30, 2021 | Feb. 01, 2019 | Dec. 04, 2017 | Jul. 18, 2016 | Oct. 30, 2014 | Sep. 29, 2014 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | Jul. 31, 2024 | |
| C000133119 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Genomic Revolution ETF | |||||||||||||
| C000133120 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Autonomous Technology & Robotics ETF | |||||||||||||
| C000133121 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Innovation ETF | |||||||||||||
| C000133122 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Next Generation Internet ETF | |||||||||||||
| C000209702 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Fintech Innovation ETF | |||||||||||||
| C000226276 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Space Exploration & Innovation ETF | |||||||||||||
| C000164426 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | The 3D Printing ETF | |||||||||||||
| C000164427 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Israel Innovative Technology ETF | |||||||||||||
| Without Sales Load [Member] | C000133119 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (28.97%) | (3.96%) | 3.93% | |||||||||||
| Without Sales Load [Member] | C000133120 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (3.86%) | 11.72% | 11.94% | |||||||||||
| Without Sales Load [Member] | C000133121 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (9.75%) | (0.65%) | 9.86% | |||||||||||
| Without Sales Load [Member] | C000133122 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 16.52% | 9.29% | 17.34% | |||||||||||
| Without Sales Load [Member] | C000209702 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 12.78% | 3.92% | 6.10% | |||||||||||
| Without Sales Load [Member] | C000226276 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (1.82%) | (7.74%) | ||||||||||||
| Without Sales Load [Member] | C000164426 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (15.53%) | (1.27%) | 0.78% | |||||||||||
| Without Sales Load [Member] | C000164427 | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (0.22%) | 0% | 0.87% | |||||||||||
| Nasdaq Healthcare Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Healthcare Index | |||||||||||||
| Average Annual Return, Percent | 9.69% | 5.21% | 4.30% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 9.73% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 9.90% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 13.06% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 12.67% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 9.19% | ||||||||||||
| The Total 3-D Printing Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | The Total 3-D Printing Index | |||||||||||||
| Average Annual Return, Percent | (14.94%) | (0.92%) | 1.41% | |||||||||||
| ARK Israeli Innovation Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | ARK Israeli Innovation Index | |||||||||||||
| Average Annual Return, Percent | 0.33% | 1.22% | 1.80% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 9.90% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 13.07% | |||||||||||
| ARK Genomic Revolution ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (29.08%) | (4.01%) | 3.94% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 13.06% | |||||||||||
| Nasdaq Industrials Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | Nasdaq Industrials Index | |||||||||||||
| Average Annual Return, Percent | 6.97% | 9.13% | 10.99% | |||||||||||
| ARK Autonomous Technology & Robotics ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (3.96%) | 11.70% | 11.94% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 13.07% | |||||||||||
| ARK Innovation ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (9.75%) | (0.68%) | 9.88% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 9.73% | |||||||||||
| ARK Next Generation Internet ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 15.57% | 9.07% | 17.26% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 15.78% | |||||||||||
| ARK Fintech Innovation ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | 12.48% | 3.89% | 6.08% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 12.20% | ||||||||||||
| ARK Space Exploration & Innovation ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (2.18%) | (7.80%) | ||||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 11.53% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 14.36% | |||||||||||
| The 3D Printing ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (15.60%) | (1.50%) | 0.76% | |||||||||||
| MSCI World Index (Net) | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | MSCI World Index (Net) | |||||||||||||
| Average Annual Return, Percent | 18.34% | 12.06% | 10.37% | |||||||||||
| S&P 500 Index | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Line Graph and Table Measure Name | S&P 500 Index | |||||||||||||
| Average Annual Return, Percent | 22.15% | 15% | 13.66% | |||||||||||
| ARK Israel Innovative Technology ETF - Market | ||||||||||||||
| Average Annual Return [Line Items] | ||||||||||||||
| Average Annual Return, Percent | (0.45%) | (0.16%) | 0.82% |
| Shareholder Report, Holdings (Details) | Jul. 31, 2024 |
| C000133119 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 97.70% |
| C000133119 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.50% |
| C000133119 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.60% |
| C000133119 | Financials (Money Market Fund) | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000133120 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.60% |
| C000133120 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.20% |
| C000133120 | Financials (Money Market Fund) | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.20% |
| C000133120 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 35.80% |
| C000133120 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000133120 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.40% |
| C000133120 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.30% |
| C000133120 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000133121 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.10% |
| C000133121 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.90% |
| C000133121 | Financials (Money Market Fund) | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000133121 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.10% |
| C000133121 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.40% |
| C000133121 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.10% |
| C000133121 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 19.10% |
| C000133122 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.40% |
| C000133122 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.60% |
| C000133122 | Financials (Money Market Fund) | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0% |
| C000133122 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.10% |
| C000133122 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 25.60% |
| C000133122 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 32.30% |
| C000209702 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.70% |
| C000209702 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.90% |
| C000209702 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 18.30% |
| C000209702 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 49.20% |
| C000209702 | Real Estate | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.90% |
| C000226276 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 24.40% |
| C000226276 | Financials (Money Market Fund) | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.30% |
| C000226276 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 55% |
| C000226276 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 6.50% |
| C000226276 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11% |
| C000226276 | Equity Fund | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.80% |
| C000164426 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 13.20% |
| C000164426 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 41.60% |
| C000164426 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.40% |
| C000164426 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 36.90% |
| C000164426 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.90% |
| C000164426 | Consumer Staples | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000164427 | Health Care | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.60% |
| C000164427 | Information Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 57.60% |
| C000164427 | Financials (Money Market Fund) | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.10% |
| C000164427 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.20% |
| C000164427 | Consumer Discretionary | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.50% |
| C000164427 | Communication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12% |
