| Form N-CSR Cover | 12 Months Ended |
| May 31, 2024 | |
| Shareholder Report [Line Items] | |
| Document Type | N-CSR |
| Amendment Flag | false |
| Registrant Name | ALTSHARES TRUST |
| Entity Central Index Key | 0001779306 |
| Entity Investment Company Type | N-1A |
| Document Period End Date | May 31, 2024 |
| Shareholder Report | 12 Months Ended | 49 Months Ended | 113 Months Ended |
| May 31, 2024 USD ($) Holding | May 31, 2024 USD ($) Holding | May 31, 2024 USD ($) Holding | |
| Shareholder Report [Line Items] | |||
| Document Type | N-CSR | ||
| Amendment Flag | false | ||
| Registrant Name | ALTSHARES TRUST | ||
| Entity Central Index Key | 0001779306 | ||
| Entity Investment Company Type | N-1A | ||
| Document Period End Date | May 31, 2024 | ||
| C000229260 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AltShares Event-Driven ETF | ||
| Trading Symbol | EVNT | ||
| Security Exchange Name | NYSEArca | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AltShares Event-Driven ETF for the period of June 1, 2023 to May 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the Fund at www.altsharesetfs.com/evnt | ||
| Additional Information Phone Number | 1-855-955-1607 | ||
| Additional Information Website | www.altsharesetfs.com/evnt</span>" id="sjs-B19"><span style="box-sizing: border-box; color: rgb(74, 82, 90); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">www.altsharesetfs.com/evnt</span> | ||
| Expenses [Text Block] | What were the Fund costs for the last year? Annual Fund Operating Expenses (based on a hypothetical $10,000 investment) Fund Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment AltShares Event-Driven ETF $135 1.30% | ||
| Expenses Paid, Amount | $ 135 | ||
| Expense Ratio, Percent | 1.30% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? The Funds performance for the fiscal year was driven by the outcomes of the idiosyncratic corporate catalysts in which the Fund invested. Returns were sourced predominantly from the Funds equity special situations investments, though the merger arbitrage and credit opportunities sleeves also contributed to performance. Most of the Funds performance was generated by investments in US-based catalysts. Information technology and energy were the top performing sectors, while health care and materials detracted the most from returns. Top contributors included the acquisition of VMware by Broadcom, Microsofts acquisition of Activision Blizzard, and the Funds investment in Kaleyra bonds. Top detractors included the Funds investments in Pacific Biosciences of California, the merger of Capri Holdings and Tapestry, and Bayer. | ||
| Line Graph [Table Text Block] | AltShares Event-Driven ETF $14,595 S&P 500 ® ICE BofA U.S. 3-Month Treasury Bill Index $11,570 Bloomberg U.S. Aggregate Bond Index $11,114 12/31/2014 $10,000 $10,000 $10,000 $10,000 12/31/2014 $10,000 $9,897 $10,000 $10,008 1/31/2015 $10,060 $9,600 $10,000 $10,218 2/28/2015 $10,160 $10,152 $10,000 $10,122 3/31/2015 $10,060 $9,991 $10,000 $10,169 4/30/2015 $10,230 $10,087 $10,000 $10,132 5/31/2015 $10,120 $10,217 $10,000 $10,108 6/30/2015 $9,920 $10,019 $10,001 $9,998 7/31/2015 $9,870 $10,229 $10,000 $10,067 8/31/2015 $9,590 $9,612 $10,002 $10,053 9/30/2015 $9,320 $9,374 $10,002 $10,121 10/31/2015 $9,460 $10,164 $10,001 $10,122 11/30/2015 $9,280 $10,195 $10,002 $10,096 12/31/2015 $9,258 $10,034 $10,005 $10,063 1/31/2016 $9,187 $9,536 $10,005 $10,201 2/29/2016 $9,167 $9,523 $10,008 $10,274 3/31/2016 $9,217 $10,169 $10,012 $10,368 4/30/2016 $9,379 $10,209 $10,015 $10,408 5/31/2016 $9,399 $10,392 $10,016 $10,411 6/30/2016 $9,359 $10,419 $10,020 $10,598 7/31/2016 $9,500 $10,803 $10,022 $10,665 8/31/2016 $9,652 $10,818 $10,024 $10,652 9/30/2016 $9,631 $10,820 $10,029 $10,646 10/31/2016 $9,520 $10,623 $10,032 $10,565 11/30/2016 $9,470 $11,016 $10,033 $10,315 12/31/2016 $9,682 $11,234 $10,038 $10,329 1/31/2017 $9,732 $11,447 $10,042 $10,350 2/28/2017 $9,793 $11,902 $10,046 $10,419 3/31/2017 $9,954 $11,915 $10,048 $10,414 4/30/2017 $10,005 $12,038 $10,055 $10,494 5/31/2017 $10,086 $12,207 $10,060 $10,575 6/30/2017 $10,086 $12,283 $10,068 $10,564 7/31/2017 $10,055 $12,536 $10,077 $10,610 8/31/2017 $10,076 $12,574 $10,086 $10,705 9/30/2017 $10,106 $12,834 $10,095 $10,654 10/31/2017 $10,136 $13,133 $10,104 $10,660 11/30/2017 $10,126 $13,536 $10,113 $10,646 12/31/2017 $10,247 $13,687 $10,123 $10,695 1/31/2018 $10,267 $14,470 $10,136 $10,572 2/28/2018 $10,187 $13,937 $10,145 $10,472 3/31/2018 $10,055 $13,583 $10,159 $10,539 4/30/2018 $10,096 $13,635 $10,173 $10,461 5/31/2018 $10,227 $13,963 $10,188 $10,535 6/30/2018 $10,298 $14,049 $10,205 $10,522 7/31/2018 $10,146 $14,572 $10,222 $10,525 8/31/2018 $10,136 $15,047 $10,240 $10,593 9/30/2018 $10,055 $15,132 $10,255 $10,524 10/31/2018 $9,803 $14,098 $10,273 $10,441 11/30/2018 $9,904 $14,385 $10,295 $10,504 12/31/2018 $9,765 $13,086 $10,313 $10,696 1/31/2019 $10,157 $14,135 $10,334 $10,810 2/28/2019 $10,188 $14,589 $10,352 $10,804 3/31/2019 $10,240 $14,872 $10,375 $11,011 4/30/2019 $10,405 $15,475 $10,395 $11,014 5/31/2019 $10,188 $14,491 $10,419 $11,210 6/30/2019 $10,250 $15,513 $10,441 $11,350 7/31/2019 $10,301 $15,736 $10,461 $11,375 8/31/2019 $10,178 $15,486 $10,482 $11,670 9/30/2019 $10,167 $15,776 $10,500 $11,608 10/31/2019 $10,147 $16,118 $10,521 $11,643 11/30/2019 $10,374 $16,703 $10,533 $11,637 12/31/2019 $10,440 $17,207 $10,549 $11,629 1/31/2020 $10,556 $17,200 $10,563 $11,853 2/29/2020 $10,419 $15,784 $10,578 $12,066 3/31/2020 $10,367 $13,835 $10,609 $11,995 4/30/2020 $10,829 $15,608 $10,610 $12,208 5/31/2020 $10,987 $16,352 $10,610 $12,265 6/30/2020 $11,418 $16,677 $10,612 $12,342 7/31/2020 $11,471 $17,617 $10,614 $12,527 8/31/2020 $11,870 $18,883 $10,615 $12,426 9/30/2020 $12,091 $18,166 $10,616 $12,419 10/31/2020 $11,986 $17,683 $10,617 $12,363 11/30/2020 $12,817 $19,618 $10,618 $12,485 12/31/2020 $14,977 $20,373 $10,619 $12,502 1/31/2021 $15,385 $20,167 $10,620 $12,412 2/28/2021 $15,479 $20,723 $10,621 $12,233 3/31/2021 $15,444 $21,631 $10,622 $12,080 4/30/2021 $15,432 $22,785 $10,622 $12,176 5/31/2021 $15,490 $22,944 $10,622 $12,215 6/30/2021 $15,292 $23,480 $10,622 $12,301 7/31/2021 $14,744 $24,038 $10,622 $12,439 8/31/2021 $14,849 $24,769 $10,623 $12,415 9/30/2021 $14,978 $23,617 $10,623 $12,308 10/31/2021 $15,078 $25,271 $10,623 $12,304 11/30/2021 $14,389 $25,096 $10,623 $12,341 12/31/2021 $14,561 $26,221 $10,624 $12,309 1/31/2022 $14,331 $24,864 $10,624 $12,044 2/28/2022 $14,346 $24,120 $10,625 $11,909 3/31/2022 $14,274 $25,015 $10,628 $11,579 4/30/2022 $13,944 $22,834 $10,630 $11,139 5/31/2022 $13,858 $22,876 $10,637 $11,211 6/30/2022 $13,297 $20,987 $10,640 $11,035 7/31/2022 $13,901 $22,922 $10,645 $11,305 8/31/2022 $14,015 $21,988 $10,662 $10,985 9/30/2022 $13,599 $19,963 $10,689 $10,511 10/31/2022 $13,671 $21,579 $10,706 $10,375 11/30/2022 $13,872 $22,785 $10,740 $10,756 12/31/2022 $13,316 $21,472 $10,779 $10,708 1/31/2023 $13,802 $22,821 $10,813 $11,037 2/28/2023 $13,757 $22,264 $10,848 $10,752 3/31/2023 $14,008 $23,082 $10,895 $11,025 4/30/2023 $13,978 $23,442 $10,929 $11,092 5/31/2023 $13,640 $23,544 $10,972 $10,971 6/30/2023 $14,170 $25,100 $11,022 $10,932 7/31/2023 $14,479 $25,906 $11,066 $10,924 8/31/2023 $14,465 $25,493 $11,116 $10,854 9/30/2023 $14,258 $24,278 $11,167 $10,578 10/31/2023 $14,023 $23,768 $11,217 $10,412 11/30/2023 $14,671 $25,938 $11,267 $10,883 12/31/2023 $15,084 $27,116 $11,319 $11,300 1/31/2024 $14,714 $27,572 $11,368 $11,269 2/29/2024 $14,684 $29,044 $11,414 $11,109 3/31/2024 $14,951 $29,979 $11,466 $11,212 4/30/2024 $14,388 $28,754 $11,515 $10,929 5/31/2024 $14,595 $30,180 $11,570 $11,114 | ||
| Average Annual Return [Table Text Block] | 1 Year 5 Years Since Inception 12/31/14 AltShares Event-Driven ETF NAV Returns 7.01% 7.45% 4.10% AltShares Event-Driven ETF Market Price Returns 7.01% 7.45% 4.10% S&P 500 ® 28.19% 15.80% 12.45% ICE BofA U.S. 3-Month Treasury Bill Index 5.45% 2.12% 1.56% Bloomberg U.S. Aggregate Bond Index 1.31% - 1.13% | ||
| Performance Inception Date | Dec. 31, 2014 | ||
| AssetsNet | $ 4,524,869 | $ 4,524,869 | $ 4,524,869 |
| Holdings Count | Holding | 122 | 122 | 122 |
| Advisory Fees Paid, Amount | $ 43,495 | ||
| InvestmentCompanyPortfolioTurnover | 407% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $4,524,869 Number of Portfolio Holdings 122 Total Advisory Fees Paid $43,495 Portfolio Turnover Rate 407% | ||
| Holdings [Text Block] | Sector Weighting (%) Value Value Consumer, Non-cyclical 26.98% Consumer, Cyclical 20.64% Technology 16.70% Energy 12.88% Telecommunication Services 11.26% Industrials 4.61% Financials 4.18% Materials 1.88% Utilities 0.87% | ||
| Material Fund Change [Text Block] | Material Fund Changes There were no material changes to the Fund since May 31, 2023. | ||
| C000216184 | |||
| Shareholder Report [Line Items] | |||
| Fund Name | AltShares Merger Arbitrage ETF | ||
| Trading Symbol | ARB | ||
| Security Exchange Name | NYSEArca | ||
| Annual or Semi-Annual Statement [Text Block] | This annual shareholder report contains important information about AltShares Merger Arbitrage ETF for the period of June 1, 2023 to May 31, 2024. | ||
| Shareholder Report Annual or Semi-Annual | Annual Shareholder Report | ||
| Additional Information [Text Block] | You can find additional information about the Fund at www.altsharesetfs.com/arb | ||
| Additional Information Phone Number | 1-855-955-1607 | ||
| Additional Information Website | www.altsharesetfs.com/arb</span>" id="sjs-B43"><span style="box-sizing: border-box; color: rgb(74, 82, 90); display: inline; flex-wrap: nowrap; font-size: 13.3333px; font-weight: 400; grid-area: auto; line-height: 20px; margin: 0px; overflow: visible; text-align: left; height: auto; max-height: none; min-height: 0px;">www.altsharesetfs.com/arb</span> | ||
| Expenses [Text Block] | What were the Fund costs for the last year? Annual Fund Operating Expenses (based on a hypothetical $10,000 investment) Fund Name Cost of a $10,000 investment Costs paid as a percentage of a $10,000 investment AltShares Merger Arbitrage ETF $66 0.63% | ||
| Expenses Paid, Amount | $ 66 | ||
| Expense Ratio, Percent | 0.63% | ||
| Factors Affecting Performance [Text Block] | How did the Fund perform last year and what affected its performance? The Funds performance for the fiscal year was driven by the outcomes of the idiosyncratic mergers and acquisitions transactions in which the Fund invested, notably including deals that experienced favorable outcomes despite regulatory challenges and a competitive bidding scenario. Returns were sourced predominantly from US-target transactions, though UK-targeted deals also contributed to performance. Health care and industrials were the top performing sectors, while materials and consumer discretionary detracted the most from returns. Top contributors included the acquisition of Seagen by Pfizer, the acquisition of Horizon Therapeutics by Amgen, and the acquisition of Everbridge by Thoma Bravo. Top detractors included the merger of Capri Holdings and Tapestry, the acquisition of United States Steel by Nippon Steel, and the acquisition of ANSYS by Synopsys. | ||
| Line Graph [Table Text Block] | AltShares Merger Arbitrage ETF $11,533 S&P 500 ® Water Island Merger Arbitrage USD Hedged Index $12,177 ICE BofA U.S. 3-Month Treasury Bill Index $10,905 Bloomberg U.S. Aggregate Bond Index $9,153 5/7/2020 $10,000 $10,000 $10,000 $10,000 $10,000 5/31/2020 $9,824 $10,710 $9,795 $10,000 $10,101 6/30/2020 $9,784 $10,923 $9,772 $10,002 $10,165 7/31/2020 $10,188 $11,538 $10,205 $10,004 $10,317 8/31/2020 $10,200 $12,368 $10,251 $10,005 $10,234 9/30/2020 $10,180 $11,898 $10,242 $10,006 $10,228 10/31/2020 $10,280 $11,581 $10,363 $10,007 $10,182 11/30/2020 $10,384 $12,849 $10,473 $10,008 $10,282 12/31/2020 $10,420 $13,343 $10,518 $10,009 $10,296 1/31/2021 $10,391 $13,209 $10,487 $10,010 $10,223 2/28/2021 $10,308 $13,573 $10,438 $10,011 $10,075 3/31/2021 $10,403 $14,167 $10,490 $10,011 $9,949 4/30/2021 $10,535 $14,923 $10,676 $10,011 $10,028 5/31/2021 $10,638 $15,028 $10,790 $10,012 $10,061 6/30/2021 $10,588 $15,378 $10,771 $10,011 $10,131 7/31/2021 $10,551 $15,744 $10,720 $10,012 $10,245 8/31/2021 $10,588 $16,222 $10,767 $10,012 $10,225 9/30/2021 $10,592 $15,468 $10,800 $10,013 $10,136 10/31/2021 $10,695 $16,552 $10,826 $10,012 $10,134 11/30/2021 $10,695 $16,437 $10,859 $10,013 $10,164 12/31/2021 $10,749 $17,174 $10,948 $10,014 $10,138 1/31/2022 $10,773 $16,285 $10,919 $10,013 $9,919 2/28/2022 $10,835 $15,797 $10,960 $10,014 $9,809 3/31/2022 $10,909 $16,384 $11,015 $10,017 $9,536 4/30/2022 $10,839 $14,955 $10,984 $10,019 $9,174 5/31/2022 $10,765 $14,983 $10,930 $10,026 $9,233 6/30/2022 $10,749 $13,746 $10,914 $10,028 $9,089 7/31/2022 $10,922 $15,013 $11,082 $10,033 $9,311 8/31/2022 $11,041 $14,401 $11,158 $10,049 $9,048 9/30/2022 $10,963 $13,075 $11,095 $10,074 $8,657 10/31/2022 $11,218 $14,133 $11,332 $10,090 $8,544 11/30/2022 $11,004 $14,923 $11,172 $10,123 $8,859 12/31/2022 $11,040 $14,063 $11,210 $10,159 $8,819 1/31/2023 $10,972 $14,947 $11,178 $10,191 $9,090 2/28/2023 $10,976 $14,582 $11,150 $10,224 $8,855 3/31/2023 $10,869 $15,118 $11,189 $10,268 $9,080 4/30/2023 $10,980 $15,354 $11,272 $10,301 $9,135 5/31/2023 $10,650 $15,420 $11,148 $10,341 $9,036 6/30/2023 $10,903 $16,439 $11,372 $10,388 $9,003 7/31/2023 $10,980 $16,967 $11,470 $10,430 $8,997 8/31/2023 $11,165 $16,697 $11,673 $10,477 $8,940 9/30/2023 $11,237 $15,901 $11,762 $10,525 $8,712 10/31/2023 $11,250 $15,567 $11,779 $10,572 $8,575 11/30/2023 $11,336 $16,988 $11,879 $10,619 $8,963 12/31/2023 $11,478 $17,760 $12,043 $10,669 $9,306 1/31/2024 $11,413 $18,059 $12,000 $10,714 $9,281 2/29/2024 $11,533 $19,023 $12,105 $10,758 $9,150 3/31/2024 $11,640 $19,635 $12,215 $10,807 $9,234 4/30/2024 $11,439 $18,833 $12,064 $10,853 $9,001 5/31/2024 $11,533 $19,767 $12,177 $10,905 $9,153 | ||
| Average Annual Return [Table Text Block] | 1 Year Since Inception 5/7/20 AltShares Merger Arbitrage ETF NAV Returns 8.25% 3.57% AltShares Merger Arbitrage ETF Market Price Returns 8.29% 3.57% S&P 500 ® 28.19% 18.23% Water Island Merger Arbitrage USD Hedged Index 9.23% 4.96% ICE BofA U.S. 3-Month Treasury Bill Index 5.45% 2.15% Bloomberg U.S. Aggregate Bond Index 1.31% - | ||
| Performance Inception Date | May 07, 2020 | ||
| AssetsNet | $ 71,129,474 | $ 71,129,474 | $ 71,129,474 |
| Holdings Count | Holding | 127 | 127 | 127 |
| Advisory Fees Paid, Amount | $ 377,442 | ||
| InvestmentCompanyPortfolioTurnover | 550% | ||
| Additional Fund Statistics [Text Block] | Key Fund Statistics Total Net Assets $71,129,474 Number of Portfolio Holdings 127 Total Advisory Fees Paid $377,442 Portfolio Turnover Rate 550% | ||
| Holdings [Text Block] | Sector Weighting (%) Value Value Energy 22.71% Consumer, Non-cyclical 17.25% Technology 17.20% Financials 14.40% Consumer, Cyclical 9.39% Telecommunication Services 8.13% Industrials 5.70% Materials 3.16% Utilities 2.06% | ||
| Material Fund Change [Text Block] | Material Fund Changes There were no material changes to the Fund since May 31, 2023. |
| Shareholder Report, Line Graph (Details) - USD ($) | 12 Months Ended | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| May 31, 2024 | Apr. 30, 2024 | Mar. 31, 2024 | Feb. 29, 2024 | Jan. 31, 2024 | Dec. 31, 2023 | Nov. 30, 2023 | Oct. 31, 2023 | Sep. 30, 2023 | Aug. 31, 2023 | Jul. 31, 2023 | Jun. 30, 2023 | May 31, 2023 | Apr. 30, 2023 | Mar. 31, 2023 | Feb. 28, 2023 | Jan. 31, 2023 | Dec. 31, 2022 | Nov. 30, 2022 | Oct. 31, 2022 | Sep. 30, 2022 | Aug. 31, 2022 | Jul. 31, 2022 | Jun. 30, 2022 | May 31, 2022 | Apr. 30, 2022 | Mar. 31, 2022 | Feb. 28, 2022 | Jan. 31, 2022 | Dec. 31, 2021 | Nov. 30, 2021 | Oct. 31, 2021 | Sep. 30, 2021 | Aug. 31, 2021 | Jul. 31, 2021 | Jun. 30, 2021 | May 31, 2021 | Apr. 30, 2021 | Mar. 31, 2021 | Feb. 28, 2021 | Jan. 31, 2021 | Dec. 31, 2020 | Nov. 30, 2020 | Oct. 31, 2020 | Sep. 30, 2020 | Aug. 31, 2020 | Jul. 31, 2020 | Jun. 30, 2020 | May 31, 2020 | May 06, 2020 | Apr. 30, 2020 | Mar. 31, 2020 | Feb. 29, 2020 | Jan. 31, 2020 | Dec. 31, 2019 | Nov. 30, 2019 | Oct. 31, 2019 | Sep. 30, 2019 | Aug. 31, 2019 | Jul. 31, 2019 | Jun. 30, 2019 | May 31, 2019 | Apr. 30, 2019 | Mar. 31, 2019 | Feb. 28, 2019 | Jan. 31, 2019 | Dec. 31, 2018 | Nov. 30, 2018 | Oct. 31, 2018 | Sep. 30, 2018 | Aug. 31, 2018 | Jul. 31, 2018 | Jun. 30, 2018 | May 31, 2018 | Apr. 30, 2018 | Mar. 31, 2018 | Feb. 28, 2018 | Jan. 31, 2018 | Dec. 31, 2017 | Nov. 30, 2017 | Oct. 31, 2017 | Sep. 30, 2017 | Aug. 31, 2017 | Jul. 31, 2017 | Jun. 30, 2017 | May 31, 2017 | Apr. 30, 2017 | Mar. 31, 2017 | Feb. 28, 2017 | Jan. 31, 2017 | Dec. 31, 2016 | Nov. 30, 2016 | Oct. 31, 2016 | Sep. 30, 2016 | Aug. 31, 2016 | Jul. 31, 2016 | Jun. 30, 2016 | May 31, 2016 | Apr. 30, 2016 | Mar. 31, 2016 | Feb. 29, 2016 | Jan. 31, 2016 | Dec. 31, 2015 | Nov. 30, 2015 | Oct. 31, 2015 | Sep. 30, 2015 | Aug. 31, 2015 | Jul. 31, 2015 | Jun. 30, 2015 | May 31, 2015 | Apr. 30, 2015 | Mar. 31, 2015 | Feb. 28, 2015 | Jan. 31, 2015 | Dec. 31, 2014 | Dec. 30, 2014 | |
| C000229260 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | AltShares Event-Driven ETF | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 14,595 | $ 14,388 | $ 14,951 | $ 14,684 | $ 14,714 | $ 15,084 | $ 14,671 | $ 14,023 | $ 14,258 | $ 14,465 | $ 14,479 | $ 14,170 | $ 13,640 | $ 13,978 | $ 14,008 | $ 13,757 | $ 13,802 | $ 13,316 | $ 13,872 | $ 13,671 | $ 13,599 | $ 14,015 | $ 13,901 | $ 13,297 | $ 13,858 | $ 13,944 | $ 14,274 | $ 14,346 | $ 14,331 | $ 14,561 | $ 14,389 | $ 15,078 | $ 14,978 | $ 14,849 | $ 14,744 | $ 15,292 | $ 15,490 | $ 15,432 | $ 15,444 | $ 15,479 | $ 15,385 | $ 14,977 | $ 12,817 | $ 11,986 | $ 12,091 | $ 11,870 | $ 11,471 | $ 11,418 | $ 10,987 | $ 10,829 | $ 10,367 | $ 10,419 | $ 10,556 | $ 10,440 | $ 10,374 | $ 10,147 | $ 10,167 | $ 10,178 | $ 10,301 | $ 10,250 | $ 10,188 | $ 10,405 | $ 10,240 | $ 10,188 | $ 10,157 | $ 9,765 | $ 9,904 | $ 9,803 | $ 10,055 | $ 10,136 | $ 10,146 | $ 10,298 | $ 10,227 | $ 10,096 | $ 10,055 | $ 10,187 | $ 10,267 | $ 10,247 | $ 10,126 | $ 10,136 | $ 10,106 | $ 10,076 | $ 10,055 | $ 10,086 | $ 10,086 | $ 10,005 | $ 9,954 | $ 9,793 | $ 9,732 | $ 9,682 | $ 9,470 | $ 9,520 | $ 9,631 | $ 9,652 | $ 9,500 | $ 9,359 | $ 9,399 | $ 9,379 | $ 9,217 | $ 9,167 | $ 9,187 | $ 9,258 | $ 9,280 | $ 9,460 | $ 9,320 | $ 9,590 | $ 9,870 | $ 9,920 | $ 10,120 | $ 10,230 | $ 10,060 | $ 10,160 | $ 10,060 | $ 10,000 | $ 10,000 | |
| C000216184 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | AltShares Merger Arbitrage ETF | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,533 | 11,439 | 11,640 | 11,533 | 11,413 | 11,478 | 11,336 | 11,250 | 11,237 | 11,165 | 10,980 | 10,903 | 10,650 | 10,980 | 10,869 | 10,976 | 10,972 | 11,040 | 11,004 | 11,218 | 10,963 | 11,041 | 10,922 | 10,749 | 10,765 | 10,839 | 10,909 | 10,835 | 10,773 | 10,749 | 10,695 | 10,695 | 10,592 | 10,588 | 10,551 | 10,588 | 10,638 | 10,535 | 10,403 | 10,308 | 10,391 | 10,420 | 10,384 | 10,280 | 10,180 | 10,200 | 10,188 | 9,784 | 9,824 | $ 10,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| WATER ISLAND INDEX: S&P 500® | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ®</sup> Index $30,180" id="sjs-B13">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; height: auto; max-height: none; min-height: 0px;">®</sup> Index $30,180 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 30,180 | 28,754 | 29,979 | 29,044 | 27,572 | 27,116 | 25,938 | 23,768 | 24,278 | 25,493 | 25,906 | 25,100 | 23,544 | 23,442 | 23,082 | 22,264 | 22,821 | 21,472 | 22,785 | 21,579 | 19,963 | 21,988 | 22,922 | 20,987 | 22,876 | 22,834 | 25,015 | 24,120 | 24,864 | 26,221 | 25,096 | 25,271 | 23,617 | 24,769 | 24,038 | 23,480 | 22,944 | 22,785 | 21,631 | 20,723 | 20,167 | 20,373 | 19,618 | 17,683 | 18,166 | 18,883 | 17,617 | 16,677 | 16,352 | 15,608 | 13,835 | 15,784 | 17,200 | 17,207 | 16,703 | 16,118 | 15,776 | 15,486 | 15,736 | 15,513 | 14,491 | 15,475 | 14,872 | 14,589 | 14,135 | 13,086 | 14,385 | 14,098 | 15,132 | 15,047 | 14,572 | 14,049 | 13,963 | 13,635 | 13,583 | 13,937 | 14,470 | 13,687 | 13,536 | 13,133 | 12,834 | 12,574 | 12,536 | 12,283 | 12,207 | 12,038 | 11,915 | 11,902 | 11,447 | 11,234 | 11,016 | 10,623 | 10,820 | 10,818 | 10,803 | 10,419 | 10,392 | 10,209 | 10,169 | 9,523 | 9,536 | 10,034 | 10,195 | 10,164 | 9,374 | 9,612 | 10,229 | 10,019 | 10,217 | 10,087 | 9,991 | 10,152 | 9,600 | 9,897 | 10,000 | |
| WATER ISLAND INDEX: S&P 500® | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ®</sup> Index $19,767" id="sjs-B17">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; height: auto; max-height: none; min-height: 0px;">®</sup> Index $19,767 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 19,767 | 18,833 | 19,635 | 19,023 | 18,059 | 17,760 | 16,988 | 15,567 | 15,901 | 16,697 | 16,967 | 16,439 | 15,420 | 15,354 | 15,118 | 14,582 | 14,947 | 14,063 | 14,923 | 14,133 | 13,075 | 14,401 | 15,013 | 13,746 | 14,983 | 14,955 | 16,384 | 15,797 | 16,285 | 17,174 | 16,437 | 16,552 | 15,468 | 16,222 | 15,744 | 15,378 | 15,028 | 14,923 | 14,167 | 13,573 | 13,209 | 13,343 | 12,849 | 11,581 | 11,898 | 12,368 | 11,538 | 10,923 | 10,710 | 10,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| WATER ISLAND INDEX: ICE BOFAML 3-MONTH TREASURY BILL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. 3-Month Treasury Bill Index $11,570 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,570 | 11,515 | 11,466 | 11,414 | 11,368 | 11,319 | 11,267 | 11,217 | 11,167 | 11,116 | 11,066 | 11,022 | 10,972 | 10,929 | 10,895 | 10,848 | 10,813 | 10,779 | 10,740 | 10,706 | 10,689 | 10,662 | 10,645 | 10,640 | 10,637 | 10,630 | 10,628 | 10,625 | 10,624 | 10,624 | 10,623 | 10,623 | 10,623 | 10,623 | 10,622 | 10,622 | 10,622 | 10,622 | 10,622 | 10,621 | 10,620 | 10,619 | 10,618 | 10,617 | 10,616 | 10,615 | 10,614 | 10,612 | 10,610 | 10,610 | 10,609 | 10,578 | 10,563 | 10,549 | 10,533 | 10,521 | 10,500 | 10,482 | 10,461 | 10,441 | 10,419 | 10,395 | 10,375 | 10,352 | 10,334 | 10,313 | 10,295 | 10,273 | 10,255 | 10,240 | 10,222 | 10,205 | 10,188 | 10,173 | 10,159 | 10,145 | 10,136 | 10,123 | 10,113 | 10,104 | 10,095 | 10,086 | 10,077 | 10,068 | 10,060 | 10,055 | 10,048 | 10,046 | 10,042 | 10,038 | 10,033 | 10,032 | 10,029 | 10,024 | 10,022 | 10,020 | 10,016 | 10,015 | 10,012 | 10,008 | 10,005 | 10,005 | 10,002 | 10,001 | 10,002 | 10,002 | 10,000 | 10,001 | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 | 10,000 | |
| WATER ISLAND INDEX: BLOOMBERG US AGGREGATE BOND INDEX | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,114 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 11,114 | 10,929 | 11,212 | 11,109 | 11,269 | 11,300 | 10,883 | 10,412 | 10,578 | 10,854 | 10,924 | 10,932 | 10,971 | 11,092 | 11,025 | 10,752 | 11,037 | 10,708 | 10,756 | 10,375 | 10,511 | 10,985 | 11,305 | 11,035 | 11,211 | 11,139 | 11,579 | 11,909 | 12,044 | 12,309 | 12,341 | 12,304 | 12,308 | 12,415 | 12,439 | 12,301 | 12,215 | 12,176 | 12,080 | 12,233 | 12,412 | 12,502 | 12,485 | 12,363 | 12,419 | 12,426 | 12,527 | 12,342 | 12,265 | $ 12,208 | $ 11,995 | $ 12,066 | $ 11,853 | $ 11,629 | $ 11,637 | $ 11,643 | $ 11,608 | $ 11,670 | $ 11,375 | $ 11,350 | $ 11,210 | $ 11,014 | $ 11,011 | $ 10,804 | $ 10,810 | $ 10,696 | $ 10,504 | $ 10,441 | $ 10,524 | $ 10,593 | $ 10,525 | $ 10,522 | $ 10,535 | $ 10,461 | $ 10,539 | $ 10,472 | $ 10,572 | $ 10,695 | $ 10,646 | $ 10,660 | $ 10,654 | $ 10,705 | $ 10,610 | $ 10,564 | $ 10,575 | $ 10,494 | $ 10,414 | $ 10,419 | $ 10,350 | $ 10,329 | $ 10,315 | $ 10,565 | $ 10,646 | $ 10,652 | $ 10,665 | $ 10,598 | $ 10,411 | $ 10,408 | $ 10,368 | $ 10,274 | $ 10,201 | $ 10,063 | $ 10,096 | $ 10,122 | $ 10,121 | $ 10,053 | $ 10,067 | $ 9,998 | $ 10,108 | $ 10,132 | $ 10,169 | $ 10,122 | $ 10,218 | $ 10,008 | $ 10,000 | |
| WATER ISLAND INDEX: Water Island Merger Arbitrage USD Hedged Ind | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Water Island Merger Arbitrage USD Hedged Index $12,177 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 12,177 | 12,064 | 12,215 | 12,105 | 12,000 | 12,043 | 11,879 | 11,779 | 11,762 | 11,673 | 11,470 | 11,372 | 11,148 | 11,272 | 11,189 | 11,150 | 11,178 | 11,210 | 11,172 | 11,332 | 11,095 | 11,158 | 11,082 | 10,914 | 10,930 | 10,984 | 11,015 | 10,960 | 10,919 | 10,948 | 10,859 | 10,826 | 10,800 | 10,767 | 10,720 | 10,771 | 10,790 | 10,676 | 10,490 | 10,438 | 10,487 | 10,518 | 10,473 | 10,363 | 10,242 | 10,251 | 10,205 | 9,772 | 9,795 | 10,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| WATER ISLAND INDEX: ICE BOFAML 3-MONTH TREASURY BILL | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | ICE BofA U.S. 3-Month Treasury Bill Index $10,905 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 10,905 | 10,853 | 10,807 | 10,758 | 10,714 | 10,669 | 10,619 | 10,572 | 10,525 | 10,477 | 10,430 | 10,388 | 10,341 | 10,301 | 10,268 | 10,224 | 10,191 | 10,159 | 10,123 | 10,090 | 10,074 | 10,049 | 10,033 | 10,028 | 10,026 | 10,019 | 10,017 | 10,014 | 10,013 | 10,014 | 10,013 | 10,012 | 10,013 | 10,012 | 10,012 | 10,011 | 10,012 | 10,011 | 10,011 | 10,011 | 10,010 | 10,009 | 10,008 | 10,007 | 10,006 | 10,005 | 10,004 | 10,002 | 10,000 | 10,000 | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| WATER ISLAND INDEX: BLOOMBERG US AGGREGATE BOND INDEX | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value [Line Items] | ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $9,153 | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| Account Value | $ 9,153 | $ 9,001 | $ 9,234 | $ 9,150 | $ 9,281 | $ 9,306 | $ 8,963 | $ 8,575 | $ 8,712 | $ 8,940 | $ 8,997 | $ 9,003 | $ 9,036 | $ 9,135 | $ 9,080 | $ 8,855 | $ 9,090 | $ 8,819 | $ 8,859 | $ 8,544 | $ 8,657 | $ 9,048 | $ 9,311 | $ 9,089 | $ 9,233 | $ 9,174 | $ 9,536 | $ 9,809 | $ 9,919 | $ 10,138 | $ 10,164 | $ 10,134 | $ 10,136 | $ 10,225 | $ 10,245 | $ 10,131 | $ 10,061 | $ 10,028 | $ 9,949 | $ 10,075 | $ 10,223 | $ 10,296 | $ 10,282 | $ 10,182 | $ 10,228 | $ 10,234 | $ 10,317 | $ 10,165 | $ 10,101 | $ 10,000 |
| Shareholder Report, Average Annual Return (Details) | 12 Months Ended | 49 Months Ended | 60 Months Ended | 113 Months Ended |
| May 31, 2024 | May 31, 2024 | May 31, 2024 | May 31, 2024 | |
| C000229260 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | AltShares Event-Driven ETF | |||
| Average Annual Return, Percent | 7.01% | 7.45% | 4.10% | |
| C000216184 | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | AltShares Merger Arbitrage ETF | |||
| Average Annual Return, Percent | 8.29% | 3.57% | ||
| Without Sales Load [Member] | C000229260 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 7.01% | 7.45% | 4.10% | |
| Without Sales Load [Member] | C000216184 | ||||
| Average Annual Return [Line Items] | ||||
| Average Annual Return, Percent | 8.25% | 3.57% | ||
| WATER ISLAND INDEX: S&P 500® | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup> Index $30,180" id="sjs-B19">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; height: auto; max-height: none; min-height: 0px;">®</sup> Index $30,180 | |||
| Average Annual Return, Percent | 28.19% | 15.80% | 12.45% | |
| WATER ISLAND INDEX: S&P 500® | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ®</sup> Index $19,767" id="sjs-B23">S&P 500<sup style="box-sizing: border-box; color: rgb(0, 0, 0); display: inline; flex-wrap: nowrap; font-size: 12px; font-weight: 700; grid-area: auto; line-height: 0px; margin: 0px; overflow: visible; position: relative; text-align: center; height: auto; max-height: none; min-height: 0px;">®</sup> Index $19,767 | |||
| Average Annual Return, Percent | 28.19% | 18.23% | ||
| WATER ISLAND INDEX: ICE BOFAML 3-MONTH TREASURY BILL | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. 3-Month Treasury Bill Index $11,570 | |||
| Average Annual Return, Percent | 5.45% | 2.12% | 1.56% | |
| WATER ISLAND INDEX: BLOOMBERG US AGGREGATE BOND INDEX | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $11,114 | |||
| Average Annual Return, Percent | 1.31% | (0.17%) | 1.13% | |
| WATER ISLAND INDEX: Water Island Merger Arbitrage USD Hedged Ind | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Water Island Merger Arbitrage USD Hedged Index $12,177 | |||
| Average Annual Return, Percent | 9.23% | 4.96% | ||
| WATER ISLAND INDEX: ICE BOFAML 3-MONTH TREASURY BILL | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | ICE BofA U.S. 3-Month Treasury Bill Index $10,905 | |||
| Average Annual Return, Percent | 5.45% | 2.15% | ||
| WATER ISLAND INDEX: BLOOMBERG US AGGREGATE BOND INDEX | ||||
| Average Annual Return [Line Items] | ||||
| Line Graph and Table Measure Name | Bloomberg U.S. Aggregate Bond Index $9,153 | |||
| Average Annual Return, Percent | 1.31% | (2.15%) |
| Shareholder Report, Holdings (Details) | May 31, 2024 |
| C000229260 | Americas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 88.17% |
| C000229260 | EMEA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.83% |
| C000229260 | Consumer, Non-cyclical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 26.98% |
| C000229260 | Consumer, Cyclical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 20.64% |
| C000229260 | Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 16.70% |
| C000229260 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 12.88% |
| C000229260 | Telecommunication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 11.26% |
| C000229260 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.61% |
| C000229260 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 4.18% |
| C000229260 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 1.88% |
| C000229260 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 0.87% |
| C000216184 | Americas | |
| Holdings [Line Items] | |
| Percent of Total Investments | 89.42% |
| C000216184 | EMEA | |
| Holdings [Line Items] | |
| Percent of Total Investments | 10.58% |
| C000216184 | Consumer, Non-cyclical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.25% |
| C000216184 | Consumer, Cyclical | |
| Holdings [Line Items] | |
| Percent of Total Investments | 9.39% |
| C000216184 | Technology | |
| Holdings [Line Items] | |
| Percent of Total Investments | 17.20% |
| C000216184 | Energy | |
| Holdings [Line Items] | |
| Percent of Total Investments | 22.71% |
| C000216184 | Telecommunication Services | |
| Holdings [Line Items] | |
| Percent of Total Investments | 8.13% |
| C000216184 | Industrials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 5.70% |
| C000216184 | Financials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 14.40% |
| C000216184 | Materials | |
| Holdings [Line Items] | |
| Percent of Total Investments | 3.16% |
| C000216184 | Utilities | |
| Holdings [Line Items] | |
| Percent of Total Investments | 2.06% |
