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Label Element Value
| KraneShares Bosera MSCI China A Share ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Risk/Return [Heading] rr_RiskReturnHeading KraneShares Bosera MSCI China A Share ETF
Objective [Heading] rr_ObjectiveHeading Investment Objective
Objective, Primary [Text Block] rr_ObjectivePrimaryTextBlock

The KraneShares Bosera MSCI China A Share ETF (the "Fund") seeks to provide investment results that, before fees and expenses, correspond to the price and yield performance of a specific foreign equity securities index. The Fund's current index is the MSCI China A Index (USD) (the "Underlying Index").

Expense [Heading] rr_ExpenseHeading Fees and Expenses of the Fund
Expense Narrative [Text Block] rr_ExpenseNarrativeTextBlock

The following table describes the fees and expenses you may pay if you buy and hold shares of the Fund. The table and Example below do not include the brokerage commissions or bid-ask spread that you may pay when purchasing or selling shares of the Fund.

Shareholder Fees Caption [Text] rr_ShareholderFeesCaption Shareholder Fees (fees paid directly from your investment) None
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination August 1, 2020
Portfolio Turnover [Heading] rr_PortfolioTurnoverHeading Portfolio Turnover
Portfolio Turnover [Text Block] rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or "turns over" its portfolio). A higher portfolio turnover rate may indicate higher transaction costs and may result in higher taxes when Fund shares are held in a taxable account. These costs, which are not reflected in the Annual Fund Operating Expenses or in the Example, affect the Fund's performance. During the most recent fiscal year, the Fund's portfolio turnover rate was 106% of the average value of its portfolio. This rate excludes the value of portfolio securities received or delivered as a result of in-kind creations or redemptions of the Fund's shares.
Portfolio Turnover, Rate rr_PortfolioTurnoverRate 106.00%
Expense Breakpoint, Minimum Investment Required [Amount] rr_ExpenseBreakpointMinimumInvestmentRequiredAmount $ 10,000
Expense Example [Heading] rr_ExpenseExampleHeading Example
Expense Example Narrative [Text Block] rr_ExpenseExampleNarrativeTextBlock

This Example is intended to help you compare the cost of investing in the Fund with the cost of investing in other funds. The Example assumes that you invest $10,000 in the Fund for the time periods indicated. The Example also assumes that your investment has a 5% return each year and that the Fund's operating expenses remain the same, except that it reflects the Fee Waiver for the period described above. Although your actual costs may be higher or lower, based on these assumptions, whether you do or do not sell your shares, your costs would be:

Strategy [Heading] rr_StrategyHeading Principal Investment Strategies
Strategy Narrative [Text Block] rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund will invest at least 80% of its total assets in securities of the Underlying Index and depositary receipts representing such securities. The Underlying Index reflects the large- and mid-cap Chinese renminbi ("RMB")-denominated equity securities listed on the Shenzhen or Shanghai Stock Exchanges ("A Shares") that are accessible through the Shanghai-Hong Kong Stock Connect or Shenzhen-Hong Kong Stock Connect Programs. The Underlying Index is calculated using China A Shares listings based on the offshore RMB exchange rate (commonly known as "CNH"). Underlying Index constituents are weighted by the security's free-float adjusted market capitalization calculated based on MSCI's Foreign Inclusion Factor ("FIF") and subject to Foreign Ownership Limits ("FOLs"). The FIF of a security is defined as the proportion of shares outstanding that is available for investment in the public equity markets by foreign investors. The FOL of a security is defined as the proportion of share capital of the security that is available for purchase by foreign investors.

 

A Shares are issued by companies incorporated in mainland China. Under current regulations in the People's Republic of China ("China" or the "PRC"), foreign investors can invest in A Shares only through certain institutional investors that have obtained a license and quota from the Chinese regulators or through the trading and clearing facilities of a participating exchange located outside of mainland China ("Stock Connect Programs"). Bosera Asset Management (International) Co., Ltd. ("Bosera"), the Fund's sub-adviser, has received a license as a Renminbi Qualified Foreign Institutional Investor ("RQFII") from the China Securities Regulatory Commission ("CSRC") and has received an A Shares quota by China's State Administration of Foreign Exchange ("SAFE") for use by the investment products it manages, including the Fund. Bosera, on behalf of the investment products it manages, may invest in A Shares and other permitted China securities up to the relevant A Shares quota(s). In addition, the Fund may invest in A Shares through the Stock Connect Programs and, in the future, Bosera may also obtain a license on behalf of the Fund as a Qualified Foreign Institutional Investor ("QFII"), another program under Chinese law that would allow it to invest in A Shares on behalf of the Fund.

 

The Fund may invest up to 20% of its assets in instruments that are not included in the Underlying Index, but that Krane and/or Bosera believes will help the Fund track the Underlying Index. These investments may include equity securities and depositary receipts of issuers whose securities are not components of the Underlying Index, derivative instruments (including swaps, futures, forwards, structured notes and options), other investment companies (including exchange traded funds or "ETFs") and cash or cash equivalents (including money market funds). Certain other investment companies in which the Fund may invest may be advised, sponsored or otherwise serviced by Krane, Bosera and/or their affiliates. The Fund will not purchase shares of an investment company if it would cause the Fund to (i) own more than 3% of such investment company's voting shares; (ii) invest more than 5% of its total assets in such investment company; or (iii) invest more than 10% of its total assets in investment companies.

 

In addition to China A-Shares, which are described above, the following China-related securities may be included in this 20% basket:

 

●China B Shares, which are shares of companies listed on the Shanghai or Shenzhen Stock Exchange but quoted and traded in foreign currencies (such as Hong Kong Dollars or U.S. Dollars), which were primarily created for trading by foreign investors.

 

●China H Shares, which are shares of companies incorporated in mainland China and listed on the Hong Kong Stock Exchange ("H-Shares"), where they are traded in Hong Kong dollars and may be traded by foreign investors.

 

●China N Shares, which are shares of companies with business operations in mainland China and listed on an American stock exchange, such as NYSE or NASDAQ ("N-Shares").

 

●P-Chips, which are shares of private sector companies with a majority of their business operations in mainland China and controlling private Chinese shareholders, which are incorporated outside of mainland China and traded on the Hong Kong Stock Exchange in Hong Kong dollars.

 

●Red Chips, which are shares of companies with a majority of their business operations in mainland China and controlled by the central, provincial or municipal governments of the PRC, whose shares are traded on the Hong Kong Stock Exchange in Hong Kong dollars.

 

●S-Chips, which are shares of companies with business operations in mainland China and listed on the Singapore Exchange. S-Chip shares are issued by companies incorporated anywhere, but many are registered in Singapore, the British Virgin Islands, the Cayman Islands, or Bermuda.

 

Although the Fund reserves the right to replicate (or hold all components of) the Underlying Index, the Fund expects to use a representative sampling strategy to track the Underlying Index. "Representative sampling" is a strategy that involves investing in a representative sample of securities that collectively have an investment profile similar to that of the Underlying Index.

 

As of May 31, 2019, the Underlying Index included 436 securities of companies with a market capitalization range of approximately $491 million to $48.5 billion and an average market capitalization of approximately $2.35 billion. The Underlying Index is rebalanced quarterly.

 

To the extent the Underlying Index is concentrated in a particular industry, the Fund is expected to be concentrated in that industry. As of May 31, 2019, issuers in the Financials sector (28.5%) represented a significant portion of the Underlying Index.

 

The Fund may engage in securities lending.
Strategy Portfolio Concentration [Text] rr_StrategyPortfolioConcentration Under normal circumstances, the Fund will invest at least 80% of its total assets in securities of the Underlying Index and depositary receipts representing such securities.
Risk [Heading] rr_RiskHeading Principal Risks
Risk Narrative [Text Block] rr_RiskNarrativeTextBlock

As with all ETFs, a shareholder of the Fund is subject to the risk that his or her investment could lose money. The Fund may not achieve its investment objective and an investment in the Fund is not by itself a complete or balanced investment program. An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency. An investment in the Fund involves the risk of total loss. In addition to these risks, the Fund is subject to a number of additional principal risks that may affect the value of its shares, including:

 

China Risk. The Chinese economy is generally considered an emerging market and can be significantly affected by economic and political conditions in China and surrounding Asian countries. In addition, the Chinese economy is export-driven and highly reliant on trade. A downturn in the economies of China's primary trading partners could slow or eliminate the growth of the Chinese economy and adversely impact the Fund's investments. The Chinese government strictly regulates the payment of foreign currency denominated obligations and sets monetary policy. The Chinese government may introduce new laws and regulations that could have an adverse effect on the Fund. Although China has begun the process of privatizing certain sectors of its economy, privatized entities may lose money and/or be re-nationalized.

 

In the Chinese securities markets, a small number of issuers may represent a large portion of the entire market. The Chinese securities markets are subject to more frequent trading halts, low trading volume and price volatility. Further, the Chinese economy is heavily dependent upon trading with key partners. Recent developments in relations between the United States and China have heightened concerns of increased tariffs and restrictions on trade between the two countries. An increase in tariffs or trade restrictions, or even the threat of such developments, could lead to a significant reduction in international trade, which could have a negative impact on China's export industry and a commensurately negative impact on the Fund.

 

In recent years, Chinese entities have incurred significant levels of debt and Chinese financial institutions currently hold relatively large amounts of non-performing debt. Thus, there exists a possibility that widespread defaults could occur, which could trigger a financial crisis, freeze Chinese debt and finance markets and make Chinese securities illiquid.

 

A-Shares Risk. A-Shares are issued by companies incorporated in mainland China and are traded on Chinese exchanges. Investments in A-Shares are made available to domestic Chinese investors and certain foreign investors, including those who have been approved as a QFII or a RQFII and through the Stock Connect Programs, which currently include the Shanghai-Hong Kong Stock Connect, Shenzhen-Hong Kong Stock Connect, Shanghai-London Stock Connect, and the China-Japan Stock Connect. Investments by other foreign investors in A-Shares are subject to various regulations and limits. Investments in A-Shares are subject to various restrictions. Investments in A-Shares are heavily regulated and the recoupment and repatriation of assets invested in A-Shares is subject to restrictions by the Chinese government. A-Shares may be subject to frequent and widespread trading halts and may become illiquid. This could cause volatility in the Fund's share price and subject the Fund to a greater risk of trading halts.

 

Custody Risks. In accordance with Chinese regulations, A-Shares acquired through a QFII or RQFII license will be held in the joint names of the Fund and Bosera. While Bosera may not use such an account for any purpose other than for maintaining the Fund's assets, the Fund's assets may not be as well protected as they would be if it were possible for them to be registered and held solely in the name of the Fund. There is a risk that creditors of Bosera may assert that the securities are owned by Bosera and that regulatory actions taken against Bosera may affect the Fund. The risk is particularly acute in the case of cash deposited with a People's Republic of China ( "PRC") sub-custodian ("PRC Custodian") because it may not be segregated, and it may be treated as a debt owing from the PRC Custodian to the Fund as a depositor. Thus, in the event of a PRC Custodian bankruptcy, liquidation, or similar event, the Fund may face difficulties and/or encounter delays in recovering its cash.

 

Tax Risk. Per a circular (Caishui [2014] 79), the Fund is temporarily exempt from the Chinese tax on capital gains on trading in A-Shares as a QFII or RQFII or the Shanghai Stock Exchange through the Shanghai-Hong Kong Stock Connect as of November 17, 2014, and the Shenzhen Stock Exchange through the Shenzhen-Hong Kong Stock Connect as of December 5, 2016. There is no indication as to how long the temporary exemption will remain in effect. Accordingly, the Fund may be subject to such taxes in the future. In addition, there is uncertainty as to the application and implementation of China's value added tax to the Fund's activities. The Fund reserves the right to establish a reserve for taxes which present uncertainty as to whether they will be assessed, although it currently does not do so. If the Fund establishes such a reserve but is not ultimately subject to these taxes, shareholders who redeemed or sold their shares while the reserve was in place will effectively bear the tax and may not benefit from the later release, if any, of the reserve. Conversely, if the Fund does not establish such a reserve but ultimately is subject to the tax, shareholders who redeemed or sold their shares prior to the tax being withheld, reserved or paid will have effectively avoided the tax. Investors should note that such provision, if any, may be excessive or inadequate to meet actual tax liabilities (which could include interest and penalties) on the Fund's investments. Any taxes imposed in connection with the Fund's activities will be borne by the Fund. As a result, investors may be advantaged or disadvantaged depending on the final rules of the relevant tax authorities.

 

Capital Controls Risk. Economic conditions, such as volatile currency exchange rates and interest rates, political events and other conditions may, without prior warning, lead to intervention by government actors and the imposition of "capital controls." Capital controls include the prohibition of, or restrictions on, the ability to transfer currency, securities or other assets. Levies may be placed on profits repatriated by foreign entities (such as the Fund). Although the RMB is not presently freely convertible, rather it is subject to the approval of the State Administration of Foreign Exchange ("SAFE") and other relevant authorities, repatriations by RQFIIs or through the Stock Connect Programs are currently permitted daily and Chinese authorities have indicated their plans to move to a fully freely convertible RMB. There is no assurance, however, that repatriation restrictions will not be (re-)imposed in the future.

 

Hong Kong Risk. The economy of Hong Kong has few natural resources and any fluctuation or shortage in the commodity markets could have a significant adverse effect on the Hong Kong economy. Hong Kong is also heavily dependent on international trade and finance. Additionally, the continuation and success of the current political, economic, legal and social policies of Hong Kong is dependent on and subject to the control of the Chinese government.

 

Stock Connect Program Risk. The Stock Connect Programs are subject to daily and aggregate quota limitations, and an investor cannot purchase and sell the same security on the same trading day, which may restrict the Fund's ability to invest in A-Shares through the Programs and to enter into or exit trades on a timely basis. The Shanghai and Shenzhen markets may be open at a time when the participating exchanges located outside of mainland China are not active, with the result that prices of A-Shares may fluctuate at times when the Fund is unable to add to or exit its positions. Only certain China A-Shares are eligible to be accessed through the Stock Connect Programs. Such securities may lose their eligibility at any time, in which case they could be sold but could no longer be purchased through the Stock Connect Programs. Because the Stock Connect Programs are still evolving, the actual effect on the market for trading A-Shares with the introduction of large numbers of foreign investors is still relatively unknown. Further, regulations or restrictions, such as limitations on redemptions or suspension of trading, may adversely impact the program. There is no guarantee that the participating exchanges will continue to support the Stock Connect Programs in the future.

 

Investments in China A-Shares may not be covered by the securities investor protection programs of either exchange and, without the protection of such programs, will be subject to the risk of default by the broker. Because of the way in which China A-Shares are held in the Stock Connect Programs, the Fund may not be able to exercise the rights of a shareholder and may be limited in its ability to pursue claims against the issuer of a security, and may suffer losses in the event the depository of the Chinese exchange becomes insolvent.

 

B-Shares Risk. The China B-Share market is generally smaller, less liquid and has a smaller issuer base than the China A-Share market. The issuers that compose the B-Share market include a broad range of companies, including companies with large, medium and small capitalizations. Further, the B-Shares market may behave very differently from other portions of the Chinese equity markets, and there may be little to no correlation between the performance of the two.

 

H-Shares Risk. H-Shares are foreign securities which, in addition to the risks described herein, are subject to the risk that the Hong Kong stock market may behave very differently from the mainland Chinese stock market. There may be little to no correlation between the performance of the Hong Kong stock market and the mainland Chinese stock market.

 

N-Shares Risk. N-Shares are securities of companies with business operations in mainland China and listed on an American stock exchange, such as the NYSE or NASDAQ. Because companies issuing N-Shares have business operations in China, they are subject to certain political and economic risks in China. The American stock market may behave very differently from the mainland Chinese stock market, and there may be little to no correlation between the performance of the two.

 

P-Chip Companies Risk. P-Chip companies are often run by the private sector and have a majority of their business operations in mainland China. P-Chip shares are traded in Hong Kong dollars on the Hong Kong Stock Exchange, and may also be traded by foreigners. Because they are traded on the Hong Kong Stock Exchange, P-Chips are also subject to risks similar to those associated with investments in H Shares. They are also subject to risks affecting their jurisdiction of incorporation, including any legal or tax changes.

 

Red Chip Companies Risk. Red Chip companies are controlled, either directly or indirectly, by the central, provincial or municipal governments of the PRC. Red Chip shares are traded in Hong Kong dollars on the Hong Kong Stock Exchange and may also be traded by foreigners. Because Red Chip companies are controlled by various PRC governmental authorities, investing in Red Chips involves risks that political changes, social instability, regulatory uncertainty, adverse diplomatic developments, asset expropriation or nationalization, or confiscatory taxation could adversely affect the performance of Red Chip companies. Red Chip companies may be less efficiently run and less profitable than other companies.

 

S-Chip Companies Risk. The Fund may invest in shares of companies with business operations in mainland China and listed on the Singapore Exchange ("S-Chips"). S-Chip shares are issued by companies incorporated anywhere, but many are registered in Singapore, the British Virgin Islands, the Cayman Islands, or Bermuda. They are subject to risks affecting their jurisdiction of incorporation, including any legal or tax changes. S-Chip companies may or may not be owned at least in part by a Chinese central, provincial or municipal government and be subject to the types of risks that come with such ownership described herein. There may be little or no correlation between the performance of the Singapore stock market and the mainland Chinese stock market.

 

Equity Securities Risk. The values of equity securities are subject to factors such as market fluctuations, changes in interest rates and perceived trends in stock prices. Equity securities may be more volatile than other asset classes and are generally subordinate in rank to debt and other securities of the same issuer.

 

Emerging Markets Risk. The Fund's investments in emerging markets are subject to greater risk of loss than investments in developed markets. This is due to, among other things, greater market volatility, greater risk of asset seizures and capital controls, lower trading volume, political and economic instability, greater risk of market shutdown, and more governmental limitations on foreign investments than typically found in developed markets. The economies of emerging markets, and China in particular, may be heavily reliant upon international trade and may suffer disproportionately if international trading declines or is disrupted.

 

Foreign Securities Risk. Investments in securities of non-U.S. issuers may be less liquid than investments in U.S. issuers, may have less governmental regulation and oversight, and are typically subject to different investor protection standards than U.S. issuers. Investments in non-U.S. securities entail the risk of loss due to foreign currency fluctuations and political or economic instability. Foreign market trading hours, clearance and settlement procedures, and holiday schedules may limit the Fund's ability to buy and sell securities. These factors could result in a loss to the Fund.

 

Geographic Focus Risk. The Fund's investments are expected to be focused in a particular country, countries, or region to the same extent as the Underlying Index and therefore the Fund may be susceptible to adverse market, political, regulatory, and geographic events affecting that country, countries or region. Such geographic focus also may subject the Fund to a higher degree of volatility than a more geographically diversified fund.

 

Currency Risk. The Fund's net asset value ("NAV") is determined on the basis of the U.S. dollar, therefore, the Fund may lose value if the local currency of a foreign market depreciates against the U.S. dollar, even if the local currency value of the Fund's holdings goes up. Currency exchange rates can be very volatile and can change quickly and unpredictably, which may adversely affect the Fund. The Fund may also be subject to delays in converting or transferring U.S. dollars to foreign currencies for the purpose of purchasing portfolio investments. This may hinder the Fund's performance, including because any delay could result in the Fund missing an investment opportunity and purchasing securities at a higher price than originally intended, or incurring cash drag.

 

Concentration Risk. The Fund's assets are expected to be concentrated in an industry or group of industries to the extent that the Underlying Index concentrates in a particular industry or group of industries. The securities of companies in an industry or group of industries could react similarly to market developments. Thus, the Fund is subject to loss due to adverse occurrences that affect one industry or group of industries or sector While the Fund's sector and industry exposure is expected to vary over time based on the composition of the Underlying Index, the Fund is currently subject to the principal risks described below. 

 

Financials Sector Risk. The performance of companies in the financials sector may be adversely impacted by many factors, including, among others, government regulations, economic conditions, credit rating downgrades, changes in interest rates, and decreased liquidity in credit markets. This sector has experienced significant losses in the recent past, and the impact of more stringent capital requirements and of recent or future regulation on any individual financial company or on the sector as a whole cannot be predicted.

 

ETF Risk. As an ETF, the Fund is subject to the following risks:

 

Authorized Participants Concentration Risk. The Fund has a limited number of financial institutions that may act as Authorized Participants. To the extent they cannot or are otherwise unwilling to engage in creation and redemption transactions with the Fund and no other Authorized Participant steps in, shares of the Fund may trade like closed-end fund shares at a significant discount to NAV and may face delisting from the Exchange.

 

Cash Transactions Risk. Like other ETFs, the Fund sells and redeems its shares only in large blocks called Creation Units and only to "Authorized Participants." Unlike many other ETFs, however, the Fund expects to effect all of its creations and redemptions for cash, rather than in-kind securities. Thus, an investment in the Fund may be less tax-efficient than an investment in other ETFs as the Fund may recognize a capital gain that it could avoid by making redemptions in-kind. As a result, the Fund may pay out higher annual capital gains distributions than ETFs that redeem in-kind. Further, paying redemption proceeds in cash rather than through in-kind delivery of portfolio securities may require the Fund to dispose of or sell portfolio investments to obtain the cash needed to distribute redemption proceeds at an inopportune time.

 

International Closed Market Trading Risk. Because substantially all of the Fund's investments trade in markets that are closed when the Fund and Exchange are open, there are likely to be deviations between current pricing of an underlying security and stale pricing, resulting in the Fund trading at a discount or premium to NAV greater than those incurred by other ETFs.

 

Premium/Discount Risk. There may be times when the market price of the Fund's shares is more than the NAV intra-day (at a premium) or less than the NAV intra-day (at a discount). As a result, shareholders of the Fund may pay more than NAV when purchasing shares and receive less than NAV when selling Fund shares. This risk is heightened in times of market volatility or periods of steep market declines. In such market conditions, market or stop loss orders to sell Fund shares may be executed at prices well below NAV.

 

Secondary Market Trading Risk. Investors buying or selling shares in the secondary market will normally pay brokerage commissions, which are often a fixed amount and may be a significant proportional cost for investors buying or selling relatively small amounts of shares. Secondary market trading is subject to bid-ask spreads and trading in Fund shares may be halted by the Exchange because of market conditions or other reasons. If a trading halt occurs, a shareholder may temporarily be unable to purchase or sell shares of the Fund. In addition, although the Fund's shares are listed on the Exchange, there can be no assurance that an active trading market for shares will develop or be maintained or that the Fund's shares will continue to be listed.

 

Liquidity Risk. The Fund's investments are subject to liquidity risk, which exists when an investment is or becomes difficult to purchase or sell at a reasonable time and price. If a transaction is particularly large or if the relevant market is or becomes illiquid, it may not be possible to initiate a transaction or liquidate a position, which may cause the Fund to suffer significant losses and difficulties in meeting redemptions. If a number of securities held by the Fund stop trading, it may have a cascading effect and cause the Fund to halt trading. Volatility in market prices will increase the risk of the Fund being subject to a trading halt. The Chinese markets may be subject to extended settlement delays and/or foreign holidays, during which the Fund will unlikely be able to convert holdings to cash.

 

Mid-Capitalization Company Risk. Investing in the securities of medium capitalization companies involves greater risk and the possibility of greater price volatility than investing in larger capitalization companies and more established companies. Since medium-sized companies may have limited operating histories, product lines and financial resources, the securities of these companies may lack sufficient market liquidity and can be sensitive to expected changes in interest rates and earnings. 

 

Large Capitalization Company Risk. Large capitalization companies may be unable to respond quickly to new competitive challenges and attain the high growth rate of successful smaller companies, especially during extended periods of economic expansion. As such, returns on investments in stocks of large capitalization companies could trail the returns on investments in stocks of small and mid capitalization companies.

 

Passive Investment Risk. There is no guarantee that the Underlying Index will create the desired exposure and the Fund is not actively managed. It does not seek to "beat" the Underlying Index or take temporary defensive positions when markets decline. Therefore, the Fund may purchase or hold securities with current or projected underperformance.

 

Management Risk. The Fund may not fully replicate the Underlying Index and may hold less than the total number of securities in the Underlying Index. Therefore, the Fund is subject to the risk that Bosera's security selection process may not produce the intended results.

 

Tracking Error Risk. The Fund's return may not match or achieve a high degree of correlation with the return of the Underlying Index. This may be due to, among other factors, the Fund holding cash under certain circumstances in lieu of Underlying Index securities, such as when the Fund is subject to delays converting U.S. dollars into a foreign currency to purchase foreign securities and unable to invest in certain components of the Underlying Index due to regulatory constraints, trading suspensions, and legal restrictions imposed by foreign governments. To the extent that the Fund employs a representative sampling strategy or calculates its NAV based on fair value prices and the value of the Underlying Index is based on securities' closing prices on local foreign markets, the Fund's ability to track the Underlying Index may be adversely affected.

 

Market Risk. The values of the Fund's holdings could decline generally or could underperform other investments. In addition, there is a risk that policy changes by the U.S. Government, Federal Reserve, and/or other government actors, such as raising interest rates, could cause volatility in global financial markets and negative sentiment, which could result in losses. Market developments may also cause the Fund's investments to become less liquid and cause the Fund to encounter difficulties in timely honoring redemptions.

 

High Portfolio Turnover Risk. The Fund may incur high turnover rates, which may increase the Fund's brokerage commission costs and negatively impact the Fund's performance. Such portfolio turnover also may generate net short-term capital gains.

 

Valuation Risk. Independent market quotations for certain investments held by the Fund may not be readily available, and such investments may be fair valued or valued by a pricing service at an evaluated price. These valuations involve subjectivity and different market participants may assign different prices to the same investment. As a result, there is a risk that the Fund may not be able to sell an investment at the price assigned to the investment by the Fund. In addition, the securities in which the Fund invests may trade on days that the Fund does not price its shares; as a result, the value of Fund shares may change on days when investors cannot purchase or sell their Fund holdings.

 

Tax Risk. In order to qualify for the favorable tax treatment available to regulated investment companies, the Fund must satisfy certain income, asset diversification and distribution requirements each year. The Fund's investments in issuers whose control persons are not certain creates a risk that tax authorities may retrospectively deem the Fund to have failed the asset diversification requirements. If the Fund were to fail the favorable tax treatment requirements, it would be taxed in the same manner as an ordinary corporation, which would adversely affect its performance.

 

Depositary Receipts Risk. The Fund may hold the securities of foreign companies in the form of depositary receipts, including American Depositary Receipts and Global Depositary Receipts. Investing in depositary receipts entails the risks associated with foreign investments, such as fluctuations in foreign currency exchange rates and political and economic risks distinct from those associated with investing in the securities of U.S. issuers. In addition, the value of the securities underlying the depositary receipts may change materially when the U.S. markets are not open for trading, which will affect the value of the depositary receipts.

 

Derivatives Risk. The use of derivatives (including swaps, futures, forwards, structured notes and options) involve risks, such as possible default by a counterparty, potential losses if markets do not move as expected, and the potential for greater losses than if these techniques had not been used. Investments in derivatives may expose the Fund to leverage, which may cause the Fund to be more volatile than if it had not been leveraged. By investing in derivatives, the Fund could lose more than the amount it invests; some derivatives can have the potential for unlimited loss. Derivatives may also be subject to valuation risk, which is the risk that valuation sources for the derivative will not be readily available in the market which is especially possible in times of market distress, during which market participants may be reluctant to purchase complex instruments or provide price quotes for them. In addition, derivatives can be difficult or impossible to sell at the time of and at the price desired by the seller.

 

Investments in Investment Companies Risk. The Fund may invest in other investment companies, including those that are advised, sponsored or otherwise serviced by Krane, Bosera and/or their affiliates. The Fund will indirectly be exposed to the risks of investments by such funds and will incur its pro rata share of the underlying fund's expenses. Additionally, investments in ETFs are subject to ETF Risk. Krane and Bosera are subject to conflicts of interest in allocating Fund assets to investment companies that are advised, sponsored or otherwise serviced by Krane, Bosera and/or their affiliates. To the extent that the Fund invests in investment companies or other pooled investment vehicles that are not registered pursuant to the 1940 Act, including foreign investment companies, it will not enjoy the protections of the U.S. law.

 

Securities Lending Risk. To the extent the Fund lends its securities, it may be subject to the following risks: (1) the securities in which the collateral is invested may not perform sufficiently to cover the return collateral payments owed to borrowers; (2) delays may occur in the recovery of securities from borrowers, which could interfere with the Fund's ability to vote proxies or to settle transactions; and (3) although borrowers of the Fund's securities typically provide collateral in the form of cash that is reinvested in securities, there is the risk of possible loss of rights in the collateral should the borrower fail financially.

  

Cash and Cash Equivalents Risk. The Fund may hold cash or cash equivalents. Generally, such positions offer less potential for gain than other investments. This is particularly true when the market for other investments in which the Fund may invest is rapidly rising. If the Fund holds cash uninvested it will be subject to the credit risk of the depositing institution holding the cash.
Risk Lose Money [Text] rr_RiskLoseMoney As with all ETFs, a shareholder of the Fund is subject to the risk that his or her investment could lose money.
Risk Not Insured Depository Institution [Text] rr_RiskNotInsuredDepositoryInstitution An investment in the Fund is not a deposit with a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.
Bar Chart and Performance Table [Heading] rr_BarChartAndPerformanceTableHeading Performance Information
Performance Narrative [Text Block] rr_PerformanceNarrativeTextBlock

The following bar chart and table illustrate the variability of the Fund's returns and indicate the risks of investing in the Fund by showing how the Fund's average annual total returns compare with those of a broad measure of market performance. All returns include the reinvestment of dividends and distributions. As always, please note that the Fund's past performance (before and after taxes) is not necessarily an indication of how it will perform in the future. In addition: (a) as of May 29, 2019, the Fund no longer seeks to provide results that, before fees and expenses, correspond generally to the price and yield performance of the MSCI China A Inclusion Index and, instead, seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the MSCI China A Index (USD); and (b) the Fund previously changed the indexes whose performance it sought to track, before fees and expenses, as detailed in the footnote to the Average Annual Total Returns table. Updated performance information is available at no cost by visiting www.kraneshares.com.

Performance Information Illustrates Variability of Returns [Text] rr_PerformanceInformationIllustratesVariabilityOfReturns The following bar chart and table illustrate the variability of the Fund’s returns and indicate the risks of investing in the Fund by showing how the Fund’s average annual total returns compare with those of a broad measure of market performance.
Performance Additional Market Index [Text] rr_PerformanceAdditionalMarketIndex In addition: (a) as of May 29, 2019, the Fund no longer seeks to provide results that, before fees and expenses, correspond generally to the price and yield performance of the MSCI China A Inclusion Index and, instead, seeks to provide investment results that, before fees and expenses, correspond generally to the price and yield performance of the MSCI China A Index (USD); and (b) the Fund previously changed the indexes whose performance it sought to track, before fees and expenses, as detailed in the footnote to the Average Annual Total Returns table.
Performance Availability Website Address [Text] rr_PerformanceAvailabilityWebSiteAddress www.kraneshares.com.
Performance Past Does Not Indicate Future [Text] rr_PerformancePastDoesNotIndicateFuture As always, please note that the Fund’s past performance (before and after taxes) is not necessarily an indication of how it will perform in the future.
Bar Chart [Heading] rr_BarChartHeading Total Annual Returns For Calendar Years Ended December 31
Bar Chart Closing [Text Block] rr_BarChartClosingTextBlock

As of June 30, 2019, the Fund's calendar year-to-date total return was 25.71%.

 

Best and Worst Quarter Returns (for the period reflected in the bar chart above) 

  Return Quarter Ended/Year
Highest Return 14.57% 03/31/2015
Lowest Return -29.82% 9/30/2015
Performance Table Heading rr_PerformanceTableHeading Average Annual Total Returns for the periods ended December 31, 2018
Performance Table Uses Highest Federal Rate rr_PerformanceTableUsesHighestFederalRate Average annual total returns are shown on a before- and after-tax basis for the Fund.
Performance Table Not Relevant to Tax Deferred rr_PerformanceTableNotRelevantToTaxDeferred After-tax returns for the Fund are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes.
Performance Table One Class of after Tax Shown [Text] rr_PerformanceTableOneClassOfAfterTaxShown Actual after-tax returns depend on an investor’s tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.
Performance Table Closing [Text Block] rr_PerformanceTableClosingTextBlock

Average annual total returns are shown on a before- and after-tax basis for the Fund. After-tax returns for the Fund are calculated using the historical highest individual federal marginal income tax rates and do not reflect the impact of state and local taxes. Actual after-tax returns depend on an investor's tax situation and may differ from those shown. After-tax returns shown are not relevant to investors who hold shares through tax-deferred arrangements, such as 401(k) plans or individual retirement plans.
| KraneShares Bosera MSCI China A Share ETF | KraneShares Bosera MSCI China A Share ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Management Fees rr_ManagementFeesOverAssets 0.78%
Distribution and/or Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none [1]
Other Expenses rr_OtherExpensesOverAssets 0.02%
Total Annual Fund Operating Expenses rr_ExpensesOverAssets 0.80%
Fee Waivers rr_FeeWaiverOrReimbursementOverAssets (0.20%) [2]
Total Annual Fund Operating Expenses After Fee Waivers rr_NetExpensesOverAssets 0.60%
1 Year rr_ExpenseExampleYear01 $ 61
3 Years rr_ExpenseExampleYear03 235
5 Years rr_ExpenseExampleYear05 425
10 Years rr_ExpenseExampleYear10 $ 971
Annual Return 2015 rr_AnnualReturn2015 (3.00%)
Annual Return 2016 rr_AnnualReturn2016 (19.37%)
Annual Return 2017 rr_AnnualReturn2017 28.64%
Annual Return 2018 rr_AnnualReturn2018 (26.25%)
Year to Date Return, Label rr_YearToDateReturnLabel year-to-date total return
Bar Chart, Year to Date Return, Date rr_BarChartYearToDateReturnDate Jun. 30, 2019
Bar Chart, Year to Date Return rr_BarChartYearToDateReturn 25.71%
Highest Quarterly Return, Label rr_HighestQuarterlyReturnLabel Highest Return
Highest Quarterly Return, Date rr_BarChartHighestQuarterlyReturnDate Mar. 31, 2015
Highest Quarterly Return rr_BarChartHighestQuarterlyReturn 14.57%
Lowest Quarterly Return, Label rr_LowestQuarterlyReturnLabel Lowest Return
Lowest Quarterly Return, Date rr_BarChartLowestQuarterlyReturnDate Sep. 30, 2015
Lowest Quarterly Return rr_BarChartLowestQuarterlyReturn (29.82%)
Label rr_AverageAnnualReturnLabel Return Before Taxes
1 Year rr_AverageAnnualReturnYear01 (26.25%)
Since Inception rr_AverageAnnualReturnSinceInception 3.08%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 04, 2014
| KraneShares Bosera MSCI China A Share ETF | S&P 500 Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes Reflects no deduction for fees, expenses or taxes
Label rr_AverageAnnualReturnLabel S&P 500 Index (Reflects no deduction for fees, expenses or taxes)
1 Year rr_AverageAnnualReturnYear01 (4.38%)
Since Inception rr_AverageAnnualReturnSinceInception 8.42%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 04, 2014
| KraneShares Bosera MSCI China A Share ETF | Hybrid KBA Index  
Prospectus [Line Items] rr_ProspectusLineItems  
Index No Deduction for Fees, Expenses, Taxes [Text] rr_IndexNoDeductionForFeesExpensesTaxes Reflects reinvested dividends net of withholding taxes, but reflects no deduction for fees, expenses or other taxes
Label rr_AverageAnnualReturnLabel Hybrid KBA Index (Net) (Reflects reinvested dividends net of withholding taxes, but reflects no deduction for fees, expenses or other taxes) [3]
1 Year rr_AverageAnnualReturnYear01 (28.26%) [3]
Since Inception rr_AverageAnnualReturnSinceInception 4.22% [3]
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 04, 2014 [3]
| KraneShares Bosera MSCI China A Share ETF | Return After Taxes on Distributions | KraneShares Bosera MSCI China A Share ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions
1 Year rr_AverageAnnualReturnYear01 (26.98%)
Since Inception rr_AverageAnnualReturnSinceInception 0.98%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 04, 2014
| KraneShares Bosera MSCI China A Share ETF | Return After Taxes on Distributions and Sale of Fund Shares | KraneShares Bosera MSCI China A Share ETF  
Prospectus [Line Items] rr_ProspectusLineItems  
Label rr_AverageAnnualReturnLabel Return After Taxes on Distributions and Sale of Fund Shares
1 Year rr_AverageAnnualReturnYear01 (16.28%)
Since Inception rr_AverageAnnualReturnSinceInception 1.99%
Inception Date rr_AverageAnnualReturnInceptionDate Mar. 04, 2014
[1] Pursuant to a Distribution Plan, the Fund may bear a Rule 12b-1 fee not to exceed 0.25% per year of the Fund's average daily net assets. However, no such fee is currently paid by the Fund, and the Board of Trustees has not currently approved the commencement of any payments under the Distribution Plan.
[2] The Fund's investment adviser, Krane Funds Advisors, LLC ("Krane" or "Adviser"), has contractually agreed to waive its management fee by 0.20% of the Fund's average daily net assets. This contractual fee waiver will continue until August 1, 2020, and may only be terminated prior thereto by the Board.
[3] The Hybrid KBA Index (net) consists of the MSCI China A Onshore Index (net) from the inception of the Fund through October 23, 2014, the MSCI China A International Index (net) from October 23, 2014 through December 26, 2017 and the MSCI China A Inclusion Index (net) from December 26, 2017 until December 31, 2018, the last date covered by the performance table above. From December 26, 2017 through December 31, 2018, the Fund sought investment results that, before fees and expenses, corresponded to the price and yield performance of the MSCI China A Inclusion Index. From October 23, 2014 through December 26, 2017, the Fund sought investment results that, before fees and expenses, corresponded to the price and yield performance of the MSCI China A International Index. Prior to October 23, 2014, the Fund sought investment results that, before fees and expenses, corresponded to the price and yield performance of the MSCI China A Onshore Index. The Hybrid KBA Index reflects the reinvestment of any cash distributions after deduction of any withholding tax, using the maximum rate applicable to non-resident institutional investors who do not benefit from double taxation treaties.