485BPOS

As filed with the Securities and Exchange Commission on March 14, 2019

1933 Act File No. 333-197734

1940 Act File No. 811-22983

SECURITIES AND EXCHANGE COMMISSION
WASHINGTON, D.C. 20549
FORM N-1A
	REGISTRATION STATEMENT UNDER THE SECURITIES ACT of 1933	o
	POST-EFFECTIVE AMENDMENT NO. 18	x
	REGISTRATION STATEMENT UNDER THE INVESTMENT COMPANY ACT OF 1940	o
	AMENDMENT NO. 23	x
EATON VANCE NEXTSHARES TRUST II
(Exact Name of Registrant as Specified in Charter)
Two International Place, Boston, Massachusetts 02110
(Address of Principal Executive Offices)
(617) 482-8260
(Registrant’s Telephone Number)
MAUREEN A. GEMMA
Two International Place, Boston, Massachusetts 02110
(Name and Address of Agent for Service)

 

It is proposed that this filing will become effective pursuant to Rule 485 (check appropriate box):
x	immediately upon filing pursuant to paragraph (b)	o	on (date) pursuant to paragraph (a)(1)
o	on (date) pursuant to paragraph (b)	o	75 days after filing pursuant to paragraph (a)(2)
o	60 days after filing pursuant to paragraph (a)(1)	o	on (date) pursuant to paragraph (a)(2)
If appropriate, check the following box:
o	This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933, as amended, and the Investment Company Act of 1940, as amended, the Registrant certifies that it meets all of the requirements for effectiveness of this Post-Effective Amendment to the Registration Statement pursuant to Rule 485(b) under the Securities Act of 1933, as amended, and has duly caused this Post-Effective Amendment to its Registration Statement to be signed on its behalf by the undersigned, thereunto duly authorized in the City of Boston, and the Commonwealth of Massachusetts, on March 14, 2019.

EATON VANCE NEXTSHARES TRUST II

By: /s/ Payson F. Swaffield

Payson F. Swaffield, President

Pursuant to the requirements of the Securities Act of 1933, as amended, this Post-Effective Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on March 14, 2019.

Signature		Title
/s/ Payson F. Swaffield		President (Chief Executive Officer)
Payson F. Swaffield
/s/ James F. Kirchner		Treasurer (Principal Financial and Accounting Officer)
James F. Kirchner
Signature		Title	Signature	Title
Thomas E. Faust Jr.*		Trustee	Helen Frame Peters*	Trustee
Thomas E. Faust Jr.			Helen Frame Peters
Mark R. Fetting*		Trustee	Keith Quinton*	Trustee
Mark R. Fetting			Keith Quinton
Cynthia E. Frost*		Trustee	Marcus L. Smith*	Trustee
Cynthia E. Frost			Marcus L. Smith
George J. Gorman*		Trustee	Susan J. Sutherland*	Trustee
George J. Gorman			Susan J. Sutherland
Valerie A. Mosley*		Trustee	Scott E. Wennerholm*	Trustee
Valerie A. Mosley			Scott E. Wennerholm
William H. Park*		Trustee
William H. Park
*By:	/s/ Maureen A. Gemma
	Maureen A. Gemma (As attorney-in-fact)

* Pursuant to a Power of Attorney dated October 10, 2018 filed as Exhibit (q) to the Registrant’s Post-Effective Amendment No. 15 filed January 25, 2019 (Accession No. 0000940394-19-000082) and incorporated herein by reference.

EXHIBIT INDEX

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Calculation Linkbase
EX-101.DEF	XBRL Taxonomy Extension Definition Linkbase
EX-101.LAB	XBRL Taxonomy Extension Labels Linkbase
Ex-101.PRE	XBRL Taxonomy Extension Presentation Linkbase

XML

Document and Entity Information	Total
Risk/Return:
Document Type	485BPOS
Document Period End Date	Oct. 31, 2018
Registrant Name	Eaton Vance NextShares Trust II
Central Index Key	0001614522
Amendment Flag	false
Document Creation Date	Feb. 27, 2019
Document Effective Date	Mar. 01, 2019
Prospectus Date	Mar. 01, 2019
Entity Inv Company Type	N-1A
Eaton Vance Floating-Rate NextShares | Eaton Vance Floating-Rate NextShares
Risk/Return:
Trading Symbol	EVFTC

XML

Eaton Vance Floating-Rate NextShares

Investment Objective

The Fund's investment objective is to provide a high level of current income.

Fees and Expenses of the Fund

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees (fees paid directly from your investment): None

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)

^[1]

Annual Fund Operating Expenses	Eaton Vance Floating-Rate NextShares Eaton Vance Floating-Rate NextShares
Management Fees	0.63%
Distribution and Service (12b-1) Fees	none
Other Expenses	2.17%	[1]
Total Annual Fund Operating Expenses	2.80%
Expense Reimbursement	(2.04%)	[2]
Total Annual Fund Operating Expenses after Expense Reimbursement	0.76%

Expenses in the table above and the Example below reflect the expenses of the Fund and Eaton Vance Floating Rate Portfolio (the “Portfolio”), the Fund’s master Portfolio.

Example.

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 and then redeem all of your shares at the end of those periods. The Example also assumes that the Fund provides a return of 5% a year, that Fund operating expenses remain the same and that any expense reimbursement remains in place for the contractual period. Investors may pay brokerage commissions on their purchases and sales of Fund shares, which are not reflected in the example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Expense Example	1 Year	3 Years	5 Years	10 Years
Eaton Vance Floating-Rate NextShares | Eaton Vance Floating-Rate NextShares | USD ($)	78	674	1,297	2,979

Portfolio Turnover

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the 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 Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. From the period from the Fund’s inception on November 29, 2017 to October 31, 2018, the Portfolio’s portfolio turnover rate was 30% of the average value of its portfolio.

Principal Investment Strategies

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in income producing floating rate loans and other floating rate debt securities. The Fund invests primarily in senior floating rate loans of domestic and foreign borrowers (“Senior Loans”). Senior Loans typically are secured with specific collateral and have a claim on the assets and/or stock of the borrower that is senior to subordinated debtholders and stockholders of the borrower. Loans usually are of below investment grade quality and have below investment grade credit ratings, which ratings are associated with securities having high risk, speculative characteristics (sometimes referred to as “junk”).

The Fund may also invest in secured and unsecured subordinated loans, second lien loans and subordinated bridge loans (“Junior Loans”), other floating rate debt securities, fixed-income debt obligations and money market instruments. Other floating rate debt securities, fixed-income debt securities and money market instruments may include: bonds, notes and debentures issued by corporations; debt securities issued or guaranteed by the U.S. Government or one of its agencies or instrumentalities; and commercial paper. Money market instruments with a remaining maturity of less than 60 days are deemed floating rate debt securities. Senior Loans and Junior Loans are referred to together herein as “loans.”

The Fund may invest up to 25% of its total assets in foreign Senior Loans. Foreign Senior Loans must be denominated in U.S. dollars, euros, British pounds, Swiss francs, Canadian dollars, or Australian dollars. The Fund may engage in derivative transactions (such as futures contracts and options thereon, foreign currency exchange contracts and other currency hedging strategies, and interest rate swaps) to seek to hedge against fluctuations in currency exchange rates and interest rates. There is no stated limit on the Fund’s use of derivatives.

The investment adviser seeks to maintain broad borrower and industry diversification among the Fund’s loans. When selecting loans, the investment adviser seeks to implement a systematic risk-weighted approach that utilizes fundamental analysis of risk/return characteristics. Loans may be sold, if in the opinion of the investment adviser, the risk-return profile deteriorates or to pursue more attractive investment opportunities. In managing the Fund, the investment adviser seeks to invest in a portfolio of loans that it believes will be less volatile over time than the general loan market. Preservation of capital is considered when consistent with the Fund’s investment objective.

The Fund currently invests its assets in the Portfolio, a separate registered investment company with substantially the same investment objective and policies as the Fund.

About NextShares^®

NextShares are a new type of actively managed exchange-traded product operating pursuant to an order issued by the SEC granting an exemption from certain provisions of the Investment Company Act of 1940, as amended (the “1940 Act”). NextShares funds began trading in February 2016 and have a limited operating history. There can be no guarantee that an active trading market for NextShares will develop or be maintained, or that their listing will continue unchanged.

Individual shares of a NextShares fund may be purchased and sold only on a national securities exchange or alternative trading system through a broker-dealer that offers NextShares (“Broker”), and may not be directly purchased or redeemed from the fund. As a new type of fund, NextShares initially may be offered by a limited number of Brokers. Trading prices of NextShares are directly linked to the fund’s next-computed net asset value per share (“NAV”), which is normally determined as of the close of regular market trading each business day. Buyers and sellers of NextShares will not know the value of their purchases and sales until NAV is determined at the end of the trading day.

Trading prices of NextShares will vary from NAV by a market-determined trading cost (i.e., a premium or discount to NAV), which may be zero. The premium or discount to NAV at which NextShares trades are executed is locked in at the time of trade execution, and will depend on market factors, including the balance of supply and demand for shares among investors, transaction fees and other costs associated with creating and redeeming Creation Units (as defined below) of shares, competition among market makers, the share inventory positions and inventory strategies of market makers, and the volume of share trading. Reflecting these and other market factors, prices of shares in the secondary market may be above, at or below NAV. See “Purchases and Sales of Fund Shares” below for important information about how to buy and sell shares.

How NextShares Compare to Mutual Funds. Mutual fund shares may be purchased and redeemed directly from the issuing fund for cash at the fund’s next determined NAV. Shares of NextShares funds, by contrast, are purchased and sold primarily in the secondary market. Because trading prices of NextShares may vary from NAV and commissions may apply, NextShares may be more expensive to buy and sell than mutual funds. Like mutual funds, NextShares may be bought or sold in specified share or dollar quantities, although not all Brokers may accept dollar-based orders.

Relative to investing in mutual funds, the NextShares structure offers certain potential advantages that may translate into improved performance and higher tax efficiency. These potential advantages include: (a) a single class of shares with no sales loads or distribution and service (12b-1) fees; (b) lower fund transfer agency expenses; (c) reduced fund trading costs and cash drag (the impact of uninvested cash on performance) in connection with investor inflows and outflows; and (d) lower fund capital gains distributions. Because NextShares do not pay sales loads or distribution and service (12b-1) fees, their appeal to financial intermediaries may be limited to distribution arrangements that do not rely upon such payments.

How NextShares Compare to ETFs. Similar to exchange-traded funds (“ETFs”), NextShares are issued and redeemed only in specified large aggregations (“Creation Units”) and trade throughout the day on an exchange. Unlike ETFs, trading prices of NextShares are directly linked to the fund’s next end-of-day NAV rather than determined at the time of trade execution. Different from ETFs, NextShares do not offer opportunities to transact intraday at currently (versus end-of-day) determined prices.

Unlike actively managed ETFs, NextShares are not required to disclose their full holdings on a daily basis, thereby protecting fund investors against the potentially dilutive effects of other market participants front-running the fund’s trades. Because the mechanism that underlies efficient trading of NextShares does not involve portfolio instruments not used in creations and redemptions, the need for full portfolio holdings disclosure to achieve tight markets in NextShares is eliminated. The NAV-based trading employed for NextShares provides investors with built-in trade execution cost transparency and the ability to control their trading costs using limit orders. This feature of NextShares distinguishes them from ETFs, for which the variance between market prices and underlying portfolio values is not always known by individual investors and cannot be controlled by them. For more information, see “Additional Information about NextShares” in this Prospectus.

Principal Risks

Market Trading Risk. Individual Fund shares may be purchased and sold only on a national securities exchange or alternative trading system through a Broker, and may not be directly purchased or redeemed from the Fund. There can be no guarantee that an active trading market for shares will develop or be maintained, or that their listing will continue unchanged. Buying and selling shares may require you to pay brokerage commissions and expose you to other trading costs. Due to brokerage commissions and other transaction costs that may apply, frequent trading may detract from realized investment returns. Trading prices of shares may be above, at or below the Fund’s NAV, will fluctuate in relation to NAV based on supply and demand in the market for shares and other factors, and may vary significantly from NAV during periods of market volatility. The return on your investment will be reduced if you sell shares at a greater discount or narrower premium to NAV than you acquired shares.

Contingent Pricing Risk. Trading prices of Fund shares are directly linked to the Funds next-computed NAV, which is normally determined as of the close of regular market trading each business day. Buyers and sellers of shares will not know the value of their purchases and sales until the Fund’s NAV is determined at the end of the trading day. Like mutual funds, the Fund does not offer opportunities to transact intraday at currently (versus end-of-day) determined prices. Trade prices are contingent upon the determination of NAV and may vary significantly from anticipated levels (including estimates based on intraday indicative values disseminated by the Fund) during periods of market volatility. Although limit orders can be used to control differences in trade prices versus NAV, they cannot be used to control or limit trade execution prices.

Market Risk. The value of investments held by the Fund may increase or decrease in response to economic, political and financial events (whether real, expected or perceived) in the U.S. and global markets. The frequency and magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, such as decreases or increases in short-term interest rates, could cause high volatility in markets. No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets. Fixed-income markets may experience periods of relatively high volatility in an environment where U.S. treasury yields are rising.

Credit Risk. Investments in loans or other income instruments are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates. In the event of bankruptcy of the issuer of a debt instrument, the Fund could experience delays or limitations with respect to its ability to realize the benefits of any collateral securing the instrument. In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value. Due to their lower place in the borrower’s capital structure, Junior Loans involve a higher degree of overall risk than Senior Loans of the same borrower.

Additional Risks of Loans. Loans are traded in a private, unregulated inter-dealer or inter-bank resale market and are generally subject to contractual restrictions that must be satisfied before a loan can be bought or sold. These restrictions may impede the Fund’s ability to buy or sell loans (thus affecting their liquidity) and may negatively impact the transaction price. See also “Market Risk” above. It also may take longer than seven days for transactions in loans to settle. Due to the possibility of an extended loan settlement process, the Fund may hold cash, sell investments or temporarily borrow from banks or other lenders to meet short-term liquidity needs, such as to satisfy redemption requests from Fund investors. The types of covenants included in loan agreements generally vary depending on market conditions, the creditworthiness of the issuer, the nature of the collateral securing the loan and possibly other factors. Loans with fewer covenants that restrict activities of the borrower may provide the borrower with more flexibility to take actions that may be detrimental to the loan holders and provide fewer investor protections in the event of such actions or if covenants are breached. The Fund may experience relatively greater realized or unrealized losses or delays and expense in enforcing its rights with respect to loans with fewer restrictive covenants. Loans to entities located outside of the U.S. may have substantially different lender protections and covenants as compared to loans to U.S. entities and may involve greater risks. The Fund may have difficulties and incur expense enforcing its rights with respect to non-U.S. loans and such loans could be subject to bankruptcy laws that are materially different than in the U.S. Loans may be structured such that they are not securities under securities law, and in the event of fraud or misrepresentation by a borrower, lenders may not have the protection of the anti-fraud provisions of the federal securities laws. Loans are also subject to risks associated with other types of income investments, including credit risk and risks of lower rated investments.

Lower Rated Investments Risk. Investments rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) have speculative characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise. Generally, securities with longer maturities are more sensitive to changes in interest rates than shorter maturity securities, causing them to be more volatile. Conversely, fixed income securities with shorter maturities will be less volatile but may provide lower returns than fixed income securities with longer maturities. The impact of interest rate changes is significantly less for floating-rate instruments that have relatively short periodic rate resets (e.g., ninety days or less). In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.

Foreign Investment Risk. Foreign investments can be adversely affected by political, economic and market developments abroad, including the imposition of economic and other sanctions by the United States or another country. Foreign markets may be smaller, less liquid and more volatile than the major markets in the United States, and as a result, Fund share values may be more volatile. Trading in foreign markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country.

Currency Risk. Exchange rates for currencies fluctuate daily. The value of foreign investments may be affected favorably or unfavorably by changes in currency exchange rates in relation to the U.S. dollar. Currency markets generally are not as regulated as securities markets and currency transactions are subject to settlement, custodial and other operational risks.

U.S. Government Securities Risk. Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality and market liquidity.

Money Market Instrument Risk. Money market instruments may be adversely affected by market and economic events, such as a sharp rise in prevailing short-term interest rates; adverse developments in the banking industry, which issues or guarantees many money market instruments; adverse economic, political or other developments affecting issuers of money market instruments; changes in the credit quality of issuers; and default by a counterparty.

Derivatives Risk. The Fund’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create leverage in the Fund, which represents a non-cash exposure to the underlying asset, index, rate or instrument. Leverage can increase both the risk and return potential of the Fund. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund. Use of derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. Changes in the value of a derivative (including one used for hedging) may not correlate perfectly with the underlying asset, rate, index or instrument. Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument. If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty. The loss on derivative transactions may substantially exceed the initial investment, particularly when there is no stated limit on the Fund’s use of derivatives. A derivative investment also involves the risks relating to the asset, index, rate or instrument underlying the investment.

Liquidity Risk. The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently, the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments to raise cash or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. These effects may be exacerbated during times of financial or political stress.

Risks Associated with Active Management. The success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills and investment judgment. Active management involves subjective decisions.

General Fund Investing Risks. The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. Purchase and redemption activities by Fund investors may impact the management of the Fund and its ability to achieve its investment objective(s). In addition, the redemption by one or more large investors or groups of investors of their holdings in the Fund could have an adverse impact on the remaining investors in the Fund. The Fund relies on various service providers, including the investment adviser, in its operations and is susceptible to operational, information security and related events (such as cyber or hacking attacks) that may affect the service providers or the services that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Performance

The returns in the bar chart and table for the period from November 29, 2017 (commencement of operations) to December 31, 2018 are for the Fund and for periods before the date the Fund commenced operations are for a mutual fund that invests in the Portfolio (the “Portfolio Investor”). The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Portfolio Investor/Fund’s average annual returns at NAV over time compare with those of a broad-based securities market index. The performance prior to November 29, 2017 does not represent the performance of the Fund. The investment performance of the Portfolio Investor (rather than the Portfolio itself) is shown because it reflects the expenses typically borne by a retail fund investing in the Portfolio. The Portfolio Investor returns are not adjusted to reflect differences between the total net operating expenses of the Fund and the Portfolio Investor during the periods shown. If such adjustment was made, the performance presented prior to November 29, 2017 would be higher, because the Fund’s total net operating expenses are lower than those of the Portfolio Investor. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The Fund’s performance reflects the effects of expense reductions. Absent these reductions, performance would have been lower. Current Fund performance information can be obtained by visiting www.eatonvance.com.

For the ten years ended December 31, 2018, the highest quarterly total return for the Portfolio Investor or the Fund was 18.99% for the quarter ended June 30, 2009, and the lowest quarterly return was -3.30% for the quarter ended December 31, 2018.

Average Annual Total Return as of December 31, 2018

Average Annual Total Returns - Eaton Vance Floating-Rate NextShares	One Year	Five Years	Ten Years
Eaton Vance Floating-Rate NextShares	0.93%	2.99%	8.01%
Eaton Vance Floating-Rate NextShares | Return After Taxes on Distributions	(1.97%)	1.06%	6.15%
Eaton Vance Floating-Rate NextShares | Return After Taxes on Distributions and the Sale of Fund Shares	0.07%	1.32%	5.68%
S&P/LSTA Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)	0.44%	3.05%	8.56%

The net asset value used in the performance calculation may be rounded to the nearest cent prior to calculation. Investors cannot invest directly in an Index.

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a investor’s tax situation and the actual characterization of distributions, and may differ from those shown. After-tax returns are not relevant for investors who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities. Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

[1] Includes interest expense of 0.03%.

[2] The investment adviser and administrator has agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 0.73%. This expense reimbursement will continue through February 29, 2020. Any amendment to or termination of this reimbursement would require approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator during the same fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

[1] Expenses in the table above and the Example below reflect the expenses of the Fund and Eaton Vance Floating Rate Portfolio (the "Portfolio"), the Fund's master Portfolio.

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Central Index Key

dei_EntityCentralIndexKey

0001614522

Eaton Vance Floating-Rate NextShares

Risk/Return:

rr_RiskReturnAbstract

Investment Objective, Heading

rr_ObjectiveHeading

Investment Objective

Investment Objective, Primary

rr_ObjectivePrimaryTextBlock

The Fund's investment objective is to provide a high level of current income.

Expense, Heading

rr_ExpenseHeading

Fees and Expenses of the Fund

Expense, Narrative

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund.

Shareholder Fees, Caption

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment): None

Operating Expenses, Caption

rr_OperatingExpensesCaption

Annual Fund Operating Expenses (expenses you pay each year as a percentage of the value of your investment)

^[1]

Fee Waiver or Reimbursement over Assets, Date of Termination

rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination

February 29, 2020

Portfolio Turnover, Heading

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover

rr_PortfolioTurnoverTextBlock

The Fund pays transaction costs, such as commissions, when it buys and sells securities (or “turns over” the 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 Annual Fund Operating Expenses or in the Example, affect the Fund’s performance. From the period from the Fund’s inception on November 29, 2017 to October 31, 2018, the Portfolio’s portfolio turnover rate was 30% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

30.00%

Expense Footnotes [Text Block]

rr_ExpenseFootnotesTextBlock

Expenses in the table above and the Example below reflect the expenses of the Fund and Eaton Vance Floating Rate Portfolio (the “Portfolio”), the Fund’s master Portfolio.

Expense Example, Heading

rr_ExpenseExampleHeading

Example.

Expense Example, Narrative

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 and then redeem all of your shares at the end of those periods. The Example also assumes that the Fund provides a return of 5% a year, that Fund operating expenses remain the same and that any expense reimbursement remains in place for the contractual period. Investors may pay brokerage commissions on their purchases and sales of Fund shares, which are not reflected in the example. Although your actual costs may be higher or lower, based on these assumptions your costs would be:

Investment Strategy, Heading

rr_StrategyHeading

Principal Investment Strategies

Investment Strategy, Narrative

rr_StrategyNarrativeTextBlock

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in income producing floating rate loans and other floating rate debt securities. The Fund invests primarily in senior floating rate loans of domestic and foreign borrowers (“Senior Loans”). Senior Loans typically are secured with specific collateral and have a claim on the assets and/or stock of the borrower that is senior to subordinated debtholders and stockholders of the borrower. Loans usually are of below investment grade quality and have below investment grade credit ratings, which ratings are associated with securities having high risk, speculative characteristics (sometimes referred to as “junk”).

The Fund may also invest in secured and unsecured subordinated loans, second lien loans and subordinated bridge loans (“Junior Loans”), other floating rate debt securities, fixed-income debt obligations and money market instruments. Other floating rate debt securities, fixed-income debt securities and money market instruments may include: bonds, notes and debentures issued by corporations; debt securities issued or guaranteed by the U.S. Government or one of its agencies or instrumentalities; and commercial paper. Money market instruments with a remaining maturity of less than 60 days are deemed floating rate debt securities. Senior Loans and Junior Loans are referred to together herein as “loans.”

The Fund may invest up to 25% of its total assets in foreign Senior Loans. Foreign Senior Loans must be denominated in U.S. dollars, euros, British pounds, Swiss francs, Canadian dollars, or Australian dollars. The Fund may engage in derivative transactions (such as futures contracts and options thereon, foreign currency exchange contracts and other currency hedging strategies, and interest rate swaps) to seek to hedge against fluctuations in currency exchange rates and interest rates. There is no stated limit on the Fund’s use of derivatives.

The investment adviser seeks to maintain broad borrower and industry diversification among the Fund’s loans. When selecting loans, the investment adviser seeks to implement a systematic risk-weighted approach that utilizes fundamental analysis of risk/return characteristics. Loans may be sold, if in the opinion of the investment adviser, the risk-return profile deteriorates or to pursue more attractive investment opportunities. In managing the Fund, the investment adviser seeks to invest in a portfolio of loans that it believes will be less volatile over time than the general loan market. Preservation of capital is considered when consistent with the Fund’s investment objective.

The Fund currently invests its assets in the Portfolio, a separate registered investment company with substantially the same investment objective and policies as the Fund.

About NextShares^®

NextShares are a new type of actively managed exchange-traded product operating pursuant to an order issued by the SEC granting an exemption from certain provisions of the Investment Company Act of 1940, as amended (the “1940 Act”). NextShares funds began trading in February 2016 and have a limited operating history. There can be no guarantee that an active trading market for NextShares will develop or be maintained, or that their listing will continue unchanged.

Individual shares of a NextShares fund may be purchased and sold only on a national securities exchange or alternative trading system through a broker-dealer that offers NextShares (“Broker”), and may not be directly purchased or redeemed from the fund. As a new type of fund, NextShares initially may be offered by a limited number of Brokers. Trading prices of NextShares are directly linked to the fund’s next-computed net asset value per share (“NAV”), which is normally determined as of the close of regular market trading each business day. Buyers and sellers of NextShares will not know the value of their purchases and sales until NAV is determined at the end of the trading day.

Trading prices of NextShares will vary from NAV by a market-determined trading cost (i.e., a premium or discount to NAV), which may be zero. The premium or discount to NAV at which NextShares trades are executed is locked in at the time of trade execution, and will depend on market factors, including the balance of supply and demand for shares among investors, transaction fees and other costs associated with creating and redeeming Creation Units (as defined below) of shares, competition among market makers, the share inventory positions and inventory strategies of market makers, and the volume of share trading. Reflecting these and other market factors, prices of shares in the secondary market may be above, at or below NAV. See “Purchases and Sales of Fund Shares” below for important information about how to buy and sell shares.

How NextShares Compare to Mutual Funds. Mutual fund shares may be purchased and redeemed directly from the issuing fund for cash at the fund’s next determined NAV. Shares of NextShares funds, by contrast, are purchased and sold primarily in the secondary market. Because trading prices of NextShares may vary from NAV and commissions may apply, NextShares may be more expensive to buy and sell than mutual funds. Like mutual funds, NextShares may be bought or sold in specified share or dollar quantities, although not all Brokers may accept dollar-based orders.

Relative to investing in mutual funds, the NextShares structure offers certain potential advantages that may translate into improved performance and higher tax efficiency. These potential advantages include: (a) a single class of shares with no sales loads or distribution and service (12b-1) fees; (b) lower fund transfer agency expenses; (c) reduced fund trading costs and cash drag (the impact of uninvested cash on performance) in connection with investor inflows and outflows; and (d) lower fund capital gains distributions. Because NextShares do not pay sales loads or distribution and service (12b-1) fees, their appeal to financial intermediaries may be limited to distribution arrangements that do not rely upon such payments.

How NextShares Compare to ETFs. Similar to exchange-traded funds (“ETFs”), NextShares are issued and redeemed only in specified large aggregations (“Creation Units”) and trade throughout the day on an exchange. Unlike ETFs, trading prices of NextShares are directly linked to the fund’s next end-of-day NAV rather than determined at the time of trade execution. Different from ETFs, NextShares do not offer opportunities to transact intraday at currently (versus end-of-day) determined prices.

Unlike actively managed ETFs, NextShares are not required to disclose their full holdings on a daily basis, thereby protecting fund investors against the potentially dilutive effects of other market participants front-running the fund’s trades. Because the mechanism that underlies efficient trading of NextShares does not involve portfolio instruments not used in creations and redemptions, the need for full portfolio holdings disclosure to achieve tight markets in NextShares is eliminated. The NAV-based trading employed for NextShares provides investors with built-in trade execution cost transparency and the ability to control their trading costs using limit orders. This feature of NextShares distinguishes them from ETFs, for which the variance between market prices and underlying portfolio values is not always known by individual investors and cannot be controlled by them. For more information, see “Additional Information about NextShares” in this Prospectus.

Strategy Portfolio Concentration

rr_StrategyPortfolioConcentration

Under normal circumstances, the Fund invests at least 80% of its net assets (plus any borrowings for investment purposes) in income producing floating rate loans and other floating rate debt securities. The Fund invests primarily in senior floating rate loans of domestic and foreign borrowers (“Senior Loans”). Senior Loans typically are secured with specific collateral and have a claim on the assets and/or stock of the borrower that is senior to subordinated debtholders and stockholders of the borrower. Loans usually are of below investment grade quality and have below investment grade credit ratings, which ratings are associated with securities having high risk, speculative characteristics (sometimes referred to as “junk”).

Risk, Heading

rr_RiskHeading

Principal Risks

Risk, Narrative

rr_RiskNarrativeTextBlock

Market Trading Risk. Individual Fund shares may be purchased and sold only on a national securities exchange or alternative trading system through a Broker, and may not be directly purchased or redeemed from the Fund. There can be no guarantee that an active trading market for shares will develop or be maintained, or that their listing will continue unchanged. Buying and selling shares may require you to pay brokerage commissions and expose you to other trading costs. Due to brokerage commissions and other transaction costs that may apply, frequent trading may detract from realized investment returns. Trading prices of shares may be above, at or below the Fund’s NAV, will fluctuate in relation to NAV based on supply and demand in the market for shares and other factors, and may vary significantly from NAV during periods of market volatility. The return on your investment will be reduced if you sell shares at a greater discount or narrower premium to NAV than you acquired shares.

Contingent Pricing Risk. Trading prices of Fund shares are directly linked to the Funds next-computed NAV, which is normally determined as of the close of regular market trading each business day. Buyers and sellers of shares will not know the value of their purchases and sales until the Fund’s NAV is determined at the end of the trading day. Like mutual funds, the Fund does not offer opportunities to transact intraday at currently (versus end-of-day) determined prices. Trade prices are contingent upon the determination of NAV and may vary significantly from anticipated levels (including estimates based on intraday indicative values disseminated by the Fund) during periods of market volatility. Although limit orders can be used to control differences in trade prices versus NAV, they cannot be used to control or limit trade execution prices.

Market Risk. The value of investments held by the Fund may increase or decrease in response to economic, political and financial events (whether real, expected or perceived) in the U.S. and global markets. The frequency and magnitude of such changes in value cannot be predicted. Certain securities and other investments held by the Fund may experience increased volatility, illiquidity, or other potentially adverse effects in reaction to changing market conditions. Actions taken by the U.S. Federal Reserve or foreign central banks to stimulate or stabilize economic growth, such as decreases or increases in short-term interest rates, could cause high volatility in markets. No active trading market may exist for certain investments, which may impair the ability of the Fund to sell or to realize the current valuation of such investments in the event of the need to liquidate such assets. Fixed-income markets may experience periods of relatively high volatility in an environment where U.S. treasury yields are rising.

Credit Risk. Investments in loans or other income instruments are subject to the risk of non-payment of scheduled principal and interest. Changes in economic conditions or other circumstances may reduce the capacity of the party obligated to make principal and interest payments on such instruments and may lead to defaults. Such non-payments and defaults may reduce the value of Fund shares and income distributions. The value of debt instruments also may decline because of concerns about the issuer’s ability to make principal and interest payments. In addition, the credit ratings of debt instruments may be lowered if the financial condition of the party obligated to make payments with respect to such instruments deteriorates. In the event of bankruptcy of the issuer of a debt instrument, the Fund could experience delays or limitations with respect to its ability to realize the benefits of any collateral securing the instrument. In order to enforce its rights in the event of a default, bankruptcy or similar situation, the Fund may be required to retain legal or similar counsel, which may increase the Fund’s operating expenses and adversely affect net asset value. Due to their lower place in the borrower’s capital structure, Junior Loans involve a higher degree of overall risk than Senior Loans of the same borrower.

Additional Risks of Loans. Loans are traded in a private, unregulated inter-dealer or inter-bank resale market and are generally subject to contractual restrictions that must be satisfied before a loan can be bought or sold. These restrictions may impede the Fund’s ability to buy or sell loans (thus affecting their liquidity) and may negatively impact the transaction price. See also “Market Risk” above. It also may take longer than seven days for transactions in loans to settle. Due to the possibility of an extended loan settlement process, the Fund may hold cash, sell investments or temporarily borrow from banks or other lenders to meet short-term liquidity needs, such as to satisfy redemption requests from Fund investors. The types of covenants included in loan agreements generally vary depending on market conditions, the creditworthiness of the issuer, the nature of the collateral securing the loan and possibly other factors. Loans with fewer covenants that restrict activities of the borrower may provide the borrower with more flexibility to take actions that may be detrimental to the loan holders and provide fewer investor protections in the event of such actions or if covenants are breached. The Fund may experience relatively greater realized or unrealized losses or delays and expense in enforcing its rights with respect to loans with fewer restrictive covenants. Loans to entities located outside of the U.S. may have substantially different lender protections and covenants as compared to loans to U.S. entities and may involve greater risks. The Fund may have difficulties and incur expense enforcing its rights with respect to non-U.S. loans and such loans could be subject to bankruptcy laws that are materially different than in the U.S. Loans may be structured such that they are not securities under securities law, and in the event of fraud or misrepresentation by a borrower, lenders may not have the protection of the anti-fraud provisions of the federal securities laws. Loans are also subject to risks associated with other types of income investments, including credit risk and risks of lower rated investments.

Lower Rated Investments Risk. Investments rated below investment grade and comparable unrated investments (sometimes referred to as “junk”) have speculative characteristics because of the credit risk associated with their issuers. Changes in economic conditions or other circumstances typically have a greater effect on the ability of issuers of lower rated investments to make principal and interest payments than they do on issuers of higher rated investments. An economic downturn generally leads to a higher non-payment rate, and a lower rated investment may lose significant value before a default occurs. Lower rated investments typically are subject to greater price volatility and illiquidity than higher rated investments.

Interest Rate Risk. In general, the value of income securities will fluctuate based on changes in interest rates. The value of these securities is likely to increase when interest rates fall and decline when interest rates rise. Generally, securities with longer maturities are more sensitive to changes in interest rates than shorter maturity securities, causing them to be more volatile. Conversely, fixed income securities with shorter maturities will be less volatile but may provide lower returns than fixed income securities with longer maturities. The impact of interest rate changes is significantly less for floating-rate instruments that have relatively short periodic rate resets (e.g., ninety days or less). In a rising interest rate environment, the duration of income securities that have the ability to be prepaid or called by the issuer may be extended. In a declining interest rate environment, the proceeds from prepaid or maturing instruments may have to be reinvested at a lower interest rate.

Foreign Investment Risk. Foreign investments can be adversely affected by political, economic and market developments abroad, including the imposition of economic and other sanctions by the United States or another country. Foreign markets may be smaller, less liquid and more volatile than the major markets in the United States, and as a result, Fund share values may be more volatile. Trading in foreign markets typically involves higher expense than trading in the United States. The Fund may have difficulties enforcing its legal or contractual rights in a foreign country.

Currency Risk. Exchange rates for currencies fluctuate daily. The value of foreign investments may be affected favorably or unfavorably by changes in currency exchange rates in relation to the U.S. dollar. Currency markets generally are not as regulated as securities markets and currency transactions are subject to settlement, custodial and other operational risks.

U.S. Government Securities Risk. Although certain U.S. Government-sponsored agencies (such as the Federal Home Loan Mortgage Corporation and the Federal National Mortgage Association) may be chartered or sponsored by acts of Congress, their securities are neither issued nor guaranteed by the U.S. Treasury. U.S. Treasury securities generally have a lower return than other obligations because of their higher credit quality and market liquidity.

Money Market Instrument Risk. Money market instruments may be adversely affected by market and economic events, such as a sharp rise in prevailing short-term interest rates; adverse developments in the banking industry, which issues or guarantees many money market instruments; adverse economic, political or other developments affecting issuers of money market instruments; changes in the credit quality of issuers; and default by a counterparty.

Derivatives Risk. The Fund’s exposure to derivatives involves risks different from, or possibly greater than, the risks associated with investing directly in securities and other investments. The use of derivatives can lead to losses because of adverse movements in the price or value of the asset, index, rate or instrument underlying a derivative, due to failure of a counterparty or due to tax or regulatory constraints. Derivatives may create leverage in the Fund, which represents a non-cash exposure to the underlying asset, index, rate or instrument. Leverage can increase both the risk and return potential of the Fund. Derivatives risk may be more significant when derivatives are used to enhance return or as a substitute for a cash investment position, rather than solely to hedge the risk of a position held by the Fund. Use of derivatives involves the exercise of specialized skill and judgment, and a transaction may be unsuccessful in whole or in part because of market behavior or unexpected events. Changes in the value of a derivative (including one used for hedging) may not correlate perfectly with the underlying asset, rate, index or instrument. Derivative instruments traded in over-the-counter markets may be difficult to value, may be illiquid, and may be subject to wide swings in valuation caused by changes in the value of the underlying instrument. If a derivative’s counterparty is unable to honor its commitments, the value of Fund shares may decline and the Fund could experience delays in the return of collateral or other assets held by the counterparty. The loss on derivative transactions may substantially exceed the initial investment, particularly when there is no stated limit on the Fund’s use of derivatives. A derivative investment also involves the risks relating to the asset, index, rate or instrument underlying the investment.

Liquidity Risk. The Fund is exposed to liquidity risk when trading volume, lack of a market maker or trading partner, large position size, market conditions, or legal restrictions impair its ability to sell particular investments or to sell them at advantageous market prices. Consequently, the Fund may have to accept a lower price to sell an investment or continue to hold it or keep the position open, sell other investments to raise cash or give up an investment opportunity, any of which could have a negative effect on the Fund’s performance. These effects may be exacerbated during times of financial or political stress.

Risks Associated with Active Management. The success of the Fund’s investment strategy depends on portfolio management’s successful application of analytical skills and investment judgment. Active management involves subjective decisions.

General Fund Investing Risks. The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund. The Fund is designed to be a long-term investment vehicle and is not suited for short-term trading. Investors in the Fund should have a long-term investment perspective and be able to tolerate potentially sharp declines in value. Purchase and redemption activities by Fund investors may impact the management of the Fund and its ability to achieve its investment objective(s). In addition, the redemption by one or more large investors or groups of investors of their holdings in the Fund could have an adverse impact on the remaining investors in the Fund. The Fund relies on various service providers, including the investment adviser, in its operations and is susceptible to operational, information security and related events (such as cyber or hacking attacks) that may affect the service providers or the services that they provide to the Fund. An investment in the Fund is not a deposit in a bank and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Risk, Lose Money

rr_RiskLoseMoney

The Fund is not a complete investment program and there is no guarantee that the Fund will achieve its investment objective. It is possible to lose money by investing in the Fund.

Risk, Not Insured Depository Institution

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a deposit in 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

Performance, Narrative

rr_PerformanceNarrativeTextBlock

The returns in the bar chart and table for the period from November 29, 2017 (commencement of operations) to December 31, 2018 are for the Fund and for periods before the date the Fund commenced operations are for a mutual fund that invests in the Portfolio (the “Portfolio Investor”). The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Portfolio Investor/Fund’s average annual returns at NAV over time compare with those of a broad-based securities market index. The performance prior to November 29, 2017 does not represent the performance of the Fund. The investment performance of the Portfolio Investor (rather than the Portfolio itself) is shown because it reflects the expenses typically borne by a retail fund investing in the Portfolio. The Portfolio Investor returns are not adjusted to reflect differences between the total net operating expenses of the Fund and the Portfolio Investor during the periods shown. If such adjustment was made, the performance presented prior to November 29, 2017 would be higher, because the Fund’s total net operating expenses are lower than those of the Portfolio Investor. Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future. The Fund’s performance reflects the effects of expense reductions. Absent these reductions, performance would have been lower. Current Fund performance information can be obtained by visiting www.eatonvance.com.

Performance, Information Illustrates Variability of Returns

rr_PerformanceInformationIllustratesVariabilityOfReturns

The returns in the bar chart and table for the period from November 29, 2017 (commencement of operations) to December 31, 2018 are for the Fund and for periods before the date the Fund commenced operations are for a mutual fund that invests in the Portfolio (the “Portfolio Investor”). The bar chart and table provide some indication of the risks of investing in the Fund by showing changes in the Fund’s performance from year to year and how the Portfolio Investor/Fund’s average annual returns at NAV over time compare with those of a broad-based securities market index.

Performance Availability Website Address

rr_PerformanceAvailabilityWebSiteAddress

www.eatonvance.com

Performance Past Does Not Indicate Future

rr_PerformancePastDoesNotIndicateFuture

Past performance (both before and after taxes) is not necessarily an indication of how the Fund will perform in the future.

Bar Chart Does Not Reflect Sales Loads

rr_BarChartDoesNotReflectSalesLoads

The Portfolio Investor returns are not adjusted to reflect differences between the total net operating expenses of the Fund and the Portfolio Investor during the periods shown.

Bar Chart, Closing

rr_BarChartClosingTextBlock

For the ten years ended December 31, 2018, the highest quarterly total return for the Portfolio Investor or the Fund was 18.99% for the quarter ended June 30, 2009, and the lowest quarterly return was -3.30% for the quarter ended December 31, 2018.

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

For the ten years ended December 31, 2018, the highest quarterly total return for the Portfolio Investor or the Fund was

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

18.99%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

and the lowest quarterly return was

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2018

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(3.30%)

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Return as of December 31, 2018

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a investor’s tax situation and the actual characterization of distributions, and may differ from those shown.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

After-tax returns are not relevant for investors who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities.

Performance Table Explanation after Tax Higher

rr_PerformanceTableExplanationAfterTaxHigher

Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Performance Table, Closing

rr_PerformanceTableClosingTextBlock

The net asset value used in the performance calculation may be rounded to the nearest cent prior to calculation. Investors cannot invest directly in an Index.

After-tax returns are calculated using the highest historical individual federal income tax rate and do not reflect the impact of state and local taxes. Actual after-tax returns depend on a investor’s tax situation and the actual characterization of distributions, and may differ from those shown. After-tax returns are not relevant for investors who hold Fund shares in tax-deferred accounts or to shares held by non-taxable entities. Return After Taxes on Distributions for a period may be the same as Return Before Taxes for that period because no taxable distributions were made during that period. Also, Return After Taxes on Distributions and Sale of Fund Shares for a period may be greater than or equal to Return After Taxes on Distributions for the same period because of losses realized on the sale of Fund shares.

Eaton Vance Floating-Rate NextShares | S&P/LSTA Leveraged Loan Index (reflects no deduction for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

Index No Deduction for Fees, Expenses, Taxes

rr_IndexNoDeductionForFeesExpensesTaxes

(reflects no deduction for fees, expenses or taxes)

One Year

rr_AverageAnnualReturnYear01

0.44%

Five Years

rr_AverageAnnualReturnYear05

3.05%

Ten Years

rr_AverageAnnualReturnYear10

8.56%

Eaton Vance Floating-Rate NextShares | Eaton Vance Floating-Rate NextShares

Risk/Return:

rr_RiskReturnAbstract

Management Fees

rr_ManagementFeesOverAssets

0.63%

Distribution and Service (12b-1) Fees

rr_DistributionAndService12b1FeesOverAssets

none

Other Expenses

rr_OtherExpensesOverAssets

2.17%

^[2]

Total Annual Fund Operating Expenses

rr_ExpensesOverAssets

2.80%

Expense Reimbursement

rr_FeeWaiverOrReimbursementOverAssets

(2.04%)

^[3]

Total Annual Fund Operating Expenses after Expense Reimbursement

rr_NetExpensesOverAssets

0.76%

1 Year

rr_ExpenseExampleYear01

$ 78

3 Years

rr_ExpenseExampleYear03

674

5 Years

rr_ExpenseExampleYear05

1,297

10 Years

rr_ExpenseExampleYear10

$ 2,979

Annual Return 2009

rr_AnnualReturn2009

46.51%

Annual Return 2010

rr_AnnualReturn2010

9.55%

Annual Return 2011

rr_AnnualReturn2011

2.44%

Annual Return 2012

rr_AnnualReturn2012

8.27%

Annual Return 2013

rr_AnnualReturn2013

4.82%

Annual Return 2014

rr_AnnualReturn2014

0.63%

Annual Return 2015

rr_AnnualReturn2015

(1.63%)

Annual Return 2016

rr_AnnualReturn2016

11.07%

Annual Return 2017

rr_AnnualReturn2017

4.42%

Annual Return 2018

rr_AnnualReturn2018

0.93%

One Year

rr_AverageAnnualReturnYear01

0.93%

Five Years

rr_AverageAnnualReturnYear05

2.99%

Ten Years

rr_AverageAnnualReturnYear10

8.01%

Eaton Vance Floating-Rate NextShares | Eaton Vance Floating-Rate NextShares | Return After Taxes on Distributions

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

(1.97%)

Five Years

rr_AverageAnnualReturnYear05

1.06%

Ten Years

rr_AverageAnnualReturnYear10

6.15%

Eaton Vance Floating-Rate NextShares | Eaton Vance Floating-Rate NextShares | Return After Taxes on Distributions and the Sale of Fund Shares

Risk/Return:

rr_RiskReturnAbstract

One Year

rr_AverageAnnualReturnYear01

0.07%

Five Years

rr_AverageAnnualReturnYear05

1.32%

Ten Years

rr_AverageAnnualReturnYear10

5.68%

[1] Expenses in the table above and the Example below reflect the expenses of the Fund and Eaton Vance Floating Rate Portfolio (the "Portfolio"), the Fund's master Portfolio.

[2] Includes interest expense of 0.03%.

[3] The investment adviser and administrator has agreed to reimburse the Fund's expenses to the extent that Total Annual Fund Operating Expenses exceed 0.73%. This expense reimbursement will continue through February 29, 2020. Any amendment to or termination of this reimbursement would require approval of the Board of Trustees. The expense reimbursement relates to ordinary operating expenses only and does not include expenses such as: brokerage commissions, acquired fund fees and expenses of unaffiliated funds, interest expense, taxes or litigation expenses. Amounts reimbursed may be recouped by the investment adviser and administrator during the same fiscal year to the extent actual expenses are less than the contractual expense cap during such year.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Oct. 31, 2018
Registrant Name	dei_EntityRegistrantName	Eaton Vance NextShares Trust II
Central Index Key	dei_EntityCentralIndexKey	0001614522
Entity Inv Company Type	dei_EntityInvCompanyType	N-1A
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Feb. 27, 2019
Document Effective Date	dei_DocumentEffectiveDate	Mar. 01, 2019
Prospectus Date	rr_ProspectusDate	Mar. 01, 2019