485BPOS

As filed with the Securities and Exchange Commission on June 14, 2018.

Registration Nos. 333-131683

811-21852

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, DC 20549

Form N-1A

REGISTRATION STATEMENT

UNDER

THE SECURITIES ACT OF 1933	☒
Pre-Effective Amendment No.	☐
Post-Effective Amendment No. 180	☒

and/or

REGISTRATION STATEMENT

UNDER

THE INVESTMENT COMPANY ACT OF 1940	☒
Amendment No. 194	☒

(Check Appropriate Box or Boxes)

COLUMBIA FUNDS SERIES TRUST II

(Exact Name of Registrant as Specified in Charter)

225 Franklin Street, Boston, Massachusetts 02110

(Address of Principal Executive Officers) (Zip Code)

Registrant’s Telephone Number, Including Area Code: (800) 345-6611

Christopher O. Petersen, Esq.

c/o Columbia Management Investment Advisers, LLC

225 Franklin Street

Boston, Massachusetts 02110

(Name and Address of Agent for Service)

Approximate Date of Proposed Public Offering:

It is proposed that this filing will become effective (check appropriate box)

☒ Immediately upon filing pursuant to paragraph (b)

☐ On (date) pursuant to paragraph (b)

☐ 60 days after filing pursuant to paragraph (a)(1)

☐ On (date) pursuant to paragraph (a)(1)

☐ 75 days after filing pursuant to paragraph (a)(2)

☐ On (date) pursuant to paragraph (a)(2) of rule 485.

If appropriate, check the following box:

☐ This post-effective amendment designates a new effective date for a previously filed post-effective amendment.

This Post-Effective Amendment relates solely to the Registrant’s Columbia Capital Allocation Aggressive Portfolio, Columbia Capital Allocation Conservative Portfolio, Columbia Capital Allocation Moderate Portfolio and Columbia Income Builder Fund series. Information contained in the Registrant’s Registration Statement relating to any other series of the Registrant is neither amended nor superseded hereby.

SIGNATURES

Pursuant to the requirements of the Securities Act of 1933 and the Investment Company Act of 1940, the Registrant,

COLUMBIA FUNDS SERIES TRUST II, certifies that it meets all of the requirements for effectiveness of this Amendment to its Registration Statement under Rule 485(b) under the Securities Act of 1933 and has duly caused this Amendment to its Registration Statement to be signed on its behalf by the undersigned, duly authorized, in the City of Minneapolis, and the State of Minnesota on the 14th day of June, 2018.

COLUMBIA FUNDS SERIES TRUST II
	By:	/s/ Christopher O. Petersen
		Christopher O. Petersen
		President

Pursuant to the requirements of the Securities Act of 1933, this Amendment to the Registration Statement has been signed below by the following persons in the capacities indicated on the 14th day of June, 2018.

Signature	Capacity	Signature	Capacity
/s/ Christopher O. Petersen      Christopher O. Petersen	President (Principal Executive Officer)	/s/ Brian J. Gallagher*      Brian J. Gallagher	Trustee
/s/ Michael G. Clarke*      Michael G. Clarke	Chief Financial Officer (Principal Financial Officer) Chief Accounting Officer (Principal Accounting Officer)	/s/ Catherine James Paglia*      Catherine James Paglia	Trustee
/s/ Edward J. Boudreau, Jr.*      Edward J. Boudreau, Jr.	Chair of the Board	/s/ Anthony M. Santomero*      Anthony M. Santomero	Trustee
/s/ George S. Batejan*      George S. Batejan	Trustee	/s/ Minor M. Shaw*      Minor M. Shaw	Trustee
/s/ Kathleen A. Blatz*      Kathleen A. Blatz	Trustee	/s/ William F. Truscott*      William F. Truscott	Trustee
/s/ Pamela G. Carlton*      Pamela G. Carlton	Trustee	/s/ Sandra Yeager*      Sandra Yeager	Trustee
/s/ William P. Carmichael*      William P. Carmichael	Trustee
/s/ Patricia M. Flynn*      Patricia M. Flynn	Trustee

*	By:	/s/ Joseph D’Alessandro
	Name:	Joseph D’Alessandro**
		Attorney-in-fact

** Executed by Joseph D’Alessandro on behalf of Michael G. Clarke pursuant to a Power of Attorney, dated May 23, 2016, and incorporated by reference to Post-Effective Amendment No. 143 to Registration Statement No. 333-131683 of the Registrant on Form N-1A (Exhibit (q)(2)), filed with the Commission on May 27, 2016, and on behalf of each of the Trustees pursuant to a Trustees’ Power of Attorney, dated January 1, 2018 and incorporated by reference to Post-Effective Amendment No. 175 to Registration Statement No. 333-131683 of the Registrant on Form N-1A (Exhibit (q)(1)), filed with the Commission on February 16, 2018.

Exhibit Index

Exhibit No.	Description
EX-101.INS	XBRL Instance Document
EX-101.SCH	XBRL Taxonomy Extension Schema Document
EX-101.CAL	XBRL Taxonomy Extension 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

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Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	485BPOS
Document Period End Date	dei_DocumentPeriodEndDate	Jan. 31, 2018
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Central Index Key	dei_EntityCentralIndexKey	0001352280
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	May 25, 2018
Document Effective Date	dei_DocumentEffectiveDate	Jun. 01, 2018
Prospectus Date	rr_ProspectusDate	Jun. 01, 2018

XML

Columbia Capital Allocation Conservative Portfolio

SUMMARY OF COLUMBIA CAPITAL ALLOCATION CONSERVATIVE PORTFOLIO

Investment Objective

Columbia Capital Allocation Conservative Portfolio (Conservative Portfolio or the Fund) is designed for investors seeking the highest level of total return that is consistent with a conservative level of risk.

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. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees - Columbia Capital Allocation Conservative Portfolio	Class A		Class C		Class Adv	Class Inst	Class Inst2	Class Inst3	Class R
Maximum sales charge (load) imposed on purchases (as a % of offering price)	4.75%		none		none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	1.00%	[1]	1.00%	[2]	none	none	none	none	none

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

Annual Fund Operating Expenses - Columbia Capital Allocation Conservative Portfolio		Class A	Class Adv	Class C	Class Inst	Class Inst2	Class Inst3	Class R
Management fees		0.10%	0.10%	0.10%	0.10%	0.10%	0.10%	0.10%
Distribution and/or service (12b-1) fees		0.25%	none	1.00%	none	none	none	0.50%
Other expenses	[1]	0.20%	0.20%	0.20%	0.20%	0.18%	0.13%	0.20%
Acquired fund fees and expenses		0.50%	0.50%	0.50%	0.50%	0.50%	0.50%	0.50%
Total annual Fund operating expenses	[2]	1.05%	0.80%	1.80%	0.80%	0.78%	0.73%	1.30%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example - Columbia Capital Allocation Conservative Portfolio - USD ($)	1 year	3 years	5 years	10 years
Class A	577	793	1,027	1,697
Class Adv	82	255	444	990
Class C	283	566	975	2,116
Class Inst	82	255	444	990
Class Inst2	80	249	433	966
Class Inst3	75	233	406	906
Class R	132	412	713	1,568

Expense Example, No Redemption - Columbia Capital Allocation Conservative Portfolio - USD ($)	1 year	3 years	5 years	10 years
Class A	577	793	1,027	1,697
Class Adv	82	255	444	990
Class C	183	566	975	2,116
Class Inst	82	255	444	990
Class Inst2	80	249	433	966
Class Inst3	75	233	406	906
Class R	132	412	713	1,568

Portfolio Turnover

The Fund and underlying funds (including exchange-traded funds (ETFs)) may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 12% of the average value of its portfolio.

Principal Investment Strategies

The Fund is primarily managed as a fund that invests in other funds (i.e., a “fund-of-funds”) that seeks to achieve its investment objective by investing under normal circumstances in a combination of underlying funds for which Columbia Management Investment Advisers, LLC (the Investment Manager) or an affiliate serves as investment adviser or principal underwriter (the affiliated underlying funds). The Fund may also invest up to 20% of its net assets in other funds, including third party advised (unaffiliated) funds and exchange-traded funds (ETFs) (collectively with the affiliated underlying funds, the Underlying Funds), equity securities, fixed income securities (including treasury inflation protected securities (TIPS)) and derivative instruments (the 20% Sleeve). The Fund’s derivative investments may include forward contracts (including forward foreign currency contracts), futures (including currency, equity, index, interest rate, and other bond futures) and options. Derivative positions may be established to seek incremental earnings, hedge existing positions, increase market or credit exposure, increase investment flexibility (including using the derivative position as a substitute for the purchase or sale of the underlying security, currency or other instrument) and/or to change the effective duration of the Fund’s portfolio. Collectively, these investments (including through investments in derivatives) provide the Fund with exposure to equity, fixed income, and cash/cash equivalent asset classes. The Fund may also pursue alternative investment strategies (alternative strategies), including those that seek investment returns uncorrelated to the broad equity and fixed income markets, as well as those providing exposure to other markets, including but not limited to absolute (positive) return strategies. The Fund can invest up to 90% of its net assets in fixed income securities.

The Fund may invest in Underlying Funds categorized as “fixed income”, “equity”, “cash/cash equivalents”, and “alternative strategies”, which may represent indirect investments in various sectors, asset classes, strategies and markets. Under normal circumstances, the Fund emphasizes investments in Underlying Funds categorized as fixed income, which can include those that invest in TIPs, U.S. treasury bonds and notes, mortgage-backed and asset-backed securities, investment grade corporate bonds, high yield bonds (junk bonds), high yield loans and international bonds (including those of issuers in developed and emerging markets), which may have varying interest rates, terms, duration and credit exposure. The Fund may also invest in Underlying Funds categorized as equity, which can include those that invest in equity securities representing different investment styles (e.g., growth, value and core/blend), market capitalizations (large-, mid- and small-cap), geographic focus (domestic and international, including emerging markets) and sector focus (e.g., real estate, technology, infrastructure and natural resources).
The Underlying Funds categorized as alternative strategies include those that employ a variety of investment strategies, techniques and practices, generally intended to have a low correlation to the performance of the broad equity and fixed income markets over a complete market cycle including but not limited to absolute (positive) return strategies. Subject to the 20% Sleeve limitation described above, the Fund may also invest directly in equity securities, fixed income securities and derivative instruments, including forward foreign currency contracts and futures (including currency, equity, fixed income, index and interest rate futures). By investing in a combination of Underlying Funds and other securities described in the 20% Sleeve, the Fund seeks to minimize the risks typically associated with investing in a traditional mutual fund.

Under normal market circumstances, the Fund may invest, directly or indirectly, in each of equity, fixed income and cash/cash equivalent asset classes and alternative strategies (each, an asset class category and collectively, the asset class categories) within the following target asset allocation ranges (includes investments in Underlying Funds and the other securities described in the 20% Sleeve):

Asset Class Exposures
	Equity	Fixed Income	Cash/Cash Equivalents	Alternatives
Conservative  Portfolio	0–40%*	50–90%*	0–40%*	0–40%*

* As a percent of Fund net assets. Ranges include the net notional amounts of a Fund’s direct investments in derivative instruments. Market appreciation or depreciation may cause a Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only with the approval of a Fund’s Board of Trustees (the Board).

The Fund may be most appropriate for investors with a shorter-term investment horizon.

Principal Risks

An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a transaction in a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations. As a result, the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that the value of loans or other debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including certain Rule 144A eligible securities. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. The Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Forward Contracts Risk. A forward contract is an over-the-counter derivative transaction between two parties to buy or sell a specified amount of an underlying reference at a specified price (or rate) on a specified date in the future. Forward contracts are negotiated on an individual basis and are not standardized or traded on exchanges. The market for forward contracts is substantially unregulated and can experience lengthy periods of illiquidity, unusually high trading volume and other negative impacts, such as political intervention, which may result in volatility or disruptions in such markets. A relatively small price movement in a forward contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. Forward contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, it is possible that the Fund may employ a high degree of leverage in the portfolio. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Futures contracts executed (if any) on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Options Risk. Options are derivatives that give the purchaser the option to buy (call) or sell (put) an underlying reference from or to a counterparty at a specified price (the strike price) on or before an expiration date. By investing in options, the Fund is exposed to the risk that it may be required to buy or sell the underlying reference at a disadvantageous price on or before the expiration date. Options may involve economic leverage, which could result in greater volatility in price movement. The Fund's losses could be significant, and are potentially unlimited for certain types of options. Options may be traded on a securities exchange or in the over-the-counter market. At or prior to maturity of an options contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in options prices. Options can increase the Fund’s risk exposure to underlying references and their attendant risks such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Performance Information

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Year by Year Total Return (%)
as of December 31 Each Year

Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          3rd Quarter 2009                                                         7.55%

Worst                                                       4th Quarter 2008                                                          -5.93%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Average Annual Total Returns - Columbia Capital Allocation Conservative Portfolio	Share Class Inception Date	1 Year	5 Years	10 Years
Class A	Mar. 04, 2004	2.79%	2.99%	3.67%
Class A | returns after taxes on distributions	Mar. 04, 2004	1.90%	1.59%	2.43%
Class A | returns after taxes on distributions and sale of Fund shares	Mar. 04, 2004	1.68%	1.89%	2.48%
Class Adv	Jun. 13, 2013	8.15%	4.21%	4.28%
Class C	Mar. 04, 2004	6.08%	3.20%	3.39%
Class Inst	Sep. 27, 2010	8.11%	4.26%	4.36%
Class Inst2	Jun. 13, 2013	8.20%	4.28%	4.32%
Class Inst3	Jun. 13, 2013	8.16%	4.31%	4.33%
Class R	Sep. 27, 2010	7.58%	3.73%	3.93%
Blended Benchmark (consisting of 66% Bloomberg Barclays U.S. Aggregate Bond Index, 15% Russell 3000 Index, 10% FTSE Three-Month U.S. Treasury Bill Index, 5% MSCI EAFE Index (Net) and 4% Bloomberg Barclays U.S. Corporate High-Yield Index) (reflects reinvested dividends net of withholding taxes on the MSCI EAFE Index portion of the Blended Benchmark, and for all indexes reflects no deductions for fees, expenses or other taxes)		6.93%	4.37%	4.61%
Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)		3.54%	2.10%	4.01%
Russell 3000 Index (reflects no deductions for fees, expenses or taxes)		21.13%	15.58%	8.60%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[2] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[1] Year to Date return as of March 31, 2018: -1.13%

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Label

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Value

Risk/Return:

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Registrant Name

dei_EntityRegistrantName

Columbia Funds Series Trust II

Prospectus Date

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Jun. 01, 2018

Columbia Capital Allocation Conservative Portfolio

Risk/Return:

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Risk/Return [Heading]

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SUMMARY OF COLUMBIA CAPITAL ALLOCATION CONSERVATIVE PORTFOLIO

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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Columbia Capital Allocation Conservative Portfolio (Conservative Portfolio or the Fund) is designed for investors seeking the highest level of total return that is consistent with a conservative level of risk.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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The Fund and underlying funds (including exchange-traded funds (ETFs)) may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 12% of the average value of its portfolio.

Portfolio Turnover, Rate

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12.00%

Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Expense Breakpoint, Minimum Investment Required [Amount]

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$ 50,000

Expenses Restated to Reflect Current [Text]

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Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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“Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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The Fund is primarily managed as a fund that invests in other funds (i.e., a “fund-of-funds”) that seeks to achieve its investment objective by investing under normal circumstances in a combination of underlying funds for which Columbia Management Investment Advisers, LLC (the Investment Manager) or an affiliate serves as investment adviser or principal underwriter (the affiliated underlying funds). The Fund may also invest up to 20% of its net assets in other funds, including third party advised (unaffiliated) funds and exchange-traded funds (ETFs) (collectively with the affiliated underlying funds, the Underlying Funds), equity securities, fixed income securities (including treasury inflation protected securities (TIPS)) and derivative instruments (the 20% Sleeve). The Fund’s derivative investments may include forward contracts (including forward foreign currency contracts), futures (including currency, equity, index, interest rate, and other bond futures) and options. Derivative positions may be established to seek incremental earnings, hedge existing positions, increase market or credit exposure, increase investment flexibility (including using the derivative position as a substitute for the purchase or sale of the underlying security, currency or other instrument) and/or to change the effective duration of the Fund’s portfolio. Collectively, these investments (including through investments in derivatives) provide the Fund with exposure to equity, fixed income, and cash/cash equivalent asset classes. The Fund may also pursue alternative investment strategies (alternative strategies), including those that seek investment returns uncorrelated to the broad equity and fixed income markets, as well as those providing exposure to other markets, including but not limited to absolute (positive) return strategies. The Fund can invest up to 90% of its net assets in fixed income securities.

The Fund may invest in Underlying Funds categorized as “fixed income”, “equity”, “cash/cash equivalents”, and “alternative strategies”, which may represent indirect investments in various sectors, asset classes, strategies and markets. Under normal circumstances, the Fund emphasizes investments in Underlying Funds categorized as fixed income, which can include those that invest in TIPs, U.S. treasury bonds and notes, mortgage-backed and asset-backed securities, investment grade corporate bonds, high yield bonds (junk bonds), high yield loans and international bonds (including those of issuers in developed and emerging markets), which may have varying interest rates, terms, duration and credit exposure. The Fund may also invest in Underlying Funds categorized as equity, which can include those that invest in equity securities representing different investment styles (e.g., growth, value and core/blend), market capitalizations (large-, mid- and small-cap), geographic focus (domestic and international, including emerging markets) and sector focus (e.g., real estate, technology, infrastructure and natural resources).
The Underlying Funds categorized as alternative strategies include those that employ a variety of investment strategies, techniques and practices, generally intended to have a low correlation to the performance of the broad equity and fixed income markets over a complete market cycle including but not limited to absolute (positive) return strategies. Subject to the 20% Sleeve limitation described above, the Fund may also invest directly in equity securities, fixed income securities and derivative instruments, including forward foreign currency contracts and futures (including currency, equity, fixed income, index and interest rate futures). By investing in a combination of Underlying Funds and other securities described in the 20% Sleeve, the Fund seeks to minimize the risks typically associated with investing in a traditional mutual fund.

Under normal market circumstances, the Fund may invest, directly or indirectly, in each of equity, fixed income and cash/cash equivalent asset classes and alternative strategies (each, an asset class category and collectively, the asset class categories) within the following target asset allocation ranges (includes investments in Underlying Funds and the other securities described in the 20% Sleeve):

Asset Class Exposures
	Equity	Fixed Income	Cash/Cash Equivalents	Alternatives
Conservative  Portfolio	0–40%*	50–90%*	0–40%*	0–40%*

* As a percent of Fund net assets. Ranges include the net notional amounts of a Fund’s direct investments in derivative instruments. Market appreciation or depreciation may cause a Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only with the approval of a Fund’s Board of Trustees (the Board).

The Fund may be most appropriate for investors with a shorter-term investment horizon.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a transaction in a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations. As a result, the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that the value of loans or other debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including certain Rule 144A eligible securities. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. The Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Forward Contracts Risk. A forward contract is an over-the-counter derivative transaction between two parties to buy or sell a specified amount of an underlying reference at a specified price (or rate) on a specified date in the future. Forward contracts are negotiated on an individual basis and are not standardized or traded on exchanges. The market for forward contracts is substantially unregulated and can experience lengthy periods of illiquidity, unusually high trading volume and other negative impacts, such as political intervention, which may result in volatility or disruptions in such markets. A relatively small price movement in a forward contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. Forward contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, it is possible that the Fund may employ a high degree of leverage in the portfolio. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Futures contracts executed (if any) on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Options Risk. Options are derivatives that give the purchaser the option to buy (call) or sell (put) an underlying reference from or to a counterparty at a specified price (the strike price) on or before an expiration date. By investing in options, the Fund is exposed to the risk that it may be required to buy or sell the underlying reference at a disadvantageous price on or before the expiration date. Options may involve economic leverage, which could result in greater volatility in price movement. The Fund's losses could be significant, and are potentially unlimited for certain types of options. Options may be traded on a securities exchange or in the over-the-counter market. At or prior to maturity of an options contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in options prices. Options can increase the Fund’s risk exposure to underlying references and their attendant risks such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is no assurance that the Fund will achieve its investment objective and you may lose money.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a bank deposit 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 show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

columbiathreadneedleus.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Year by Year Total Return (%)
as of December 31 Each Year

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          3rd Quarter 2009                                                         7.55%

Worst                                                       4th Quarter 2008                                                          -5.93%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Class A shares and will vary for other share classes.

Columbia Capital Allocation Conservative Portfolio | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.20%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.05%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 577

3 years

rr_ExpenseExampleYear03

793

5 years

rr_ExpenseExampleYear05

1,027

10 years

rr_ExpenseExampleYear10

1,697

1 year

rr_ExpenseExampleNoRedemptionYear01

577

3 years

rr_ExpenseExampleNoRedemptionYear03

793

5 years

rr_ExpenseExampleNoRedemptionYear05

1,027

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,697

2008

rr_AnnualReturn2008

(11.91%)

^[4]

2009

rr_AnnualReturn2009

15.86%

^[4]

2010

rr_AnnualReturn2010

8.62%

^[4]

2011

rr_AnnualReturn2011

2.57%

^[4]

2012

rr_AnnualReturn2012

8.81%

^[4]

2013

rr_AnnualReturn2013

4.26%

^[4]

2014

rr_AnnualReturn2014

4.61%

^[4]

2015

rr_AnnualReturn2015

(1.08%)

^[4]

2016

rr_AnnualReturn2016

4.48%

^[4]

2017

rr_AnnualReturn2017

7.95%

^[4]

Year to Date Return, Label

rr_YearToDateReturnLabel

Year to Date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(1.13%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

7.55%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(5.93%)

1 Year

rr_AverageAnnualReturnYear01

2.79%

5 Years

rr_AverageAnnualReturnYear05

2.99%

10 Years

rr_AverageAnnualReturnYear10

3.67%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Conservative Portfolio | Class Adv

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.20%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.80%

^[3]

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

990

1 year

rr_ExpenseExampleNoRedemptionYear01

82

3 years

rr_ExpenseExampleNoRedemptionYear03

255

5 years

rr_ExpenseExampleNoRedemptionYear05

444

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 990

1 Year

rr_AverageAnnualReturnYear01

8.15%

5 Years

rr_AverageAnnualReturnYear05

4.21%

10 Years

rr_AverageAnnualReturnYear10

4.28%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Conservative Portfolio | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[5]

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.20%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.80%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 283

3 years

rr_ExpenseExampleYear03

566

5 years

rr_ExpenseExampleYear05

975

10 years

rr_ExpenseExampleYear10

2,116

1 year

rr_ExpenseExampleNoRedemptionYear01

183

3 years

rr_ExpenseExampleNoRedemptionYear03

566

5 years

rr_ExpenseExampleNoRedemptionYear05

975

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 2,116

1 Year

rr_AverageAnnualReturnYear01

6.08%

5 Years

rr_AverageAnnualReturnYear05

3.20%

10 Years

rr_AverageAnnualReturnYear10

3.39%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Conservative Portfolio | Class Inst

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.20%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.80%

^[3]

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

990

1 year

rr_ExpenseExampleNoRedemptionYear01

82

3 years

rr_ExpenseExampleNoRedemptionYear03

255

5 years

rr_ExpenseExampleNoRedemptionYear05

444

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 990

1 Year

rr_AverageAnnualReturnYear01

8.11%

5 Years

rr_AverageAnnualReturnYear05

4.26%

10 Years

rr_AverageAnnualReturnYear10

4.36%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Capital Allocation Conservative Portfolio | Class Inst2

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.18%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.78%

^[3]

1 year

rr_ExpenseExampleYear01

$ 80

3 years

rr_ExpenseExampleYear03

249

5 years

rr_ExpenseExampleYear05

433

10 years

rr_ExpenseExampleYear10

966

1 year

rr_ExpenseExampleNoRedemptionYear01

80

3 years

rr_ExpenseExampleNoRedemptionYear03

249

5 years

rr_ExpenseExampleNoRedemptionYear05

433

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 966

1 Year

rr_AverageAnnualReturnYear01

8.20%

5 Years

rr_AverageAnnualReturnYear05

4.28%

10 Years

rr_AverageAnnualReturnYear10

4.32%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Conservative Portfolio | Class Inst3

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.13%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.73%

^[3]

1 year

rr_ExpenseExampleYear01

$ 75

3 years

rr_ExpenseExampleYear03

233

5 years

rr_ExpenseExampleYear05

406

10 years

rr_ExpenseExampleYear10

906

1 year

rr_ExpenseExampleNoRedemptionYear01

75

3 years

rr_ExpenseExampleNoRedemptionYear03

233

5 years

rr_ExpenseExampleNoRedemptionYear05

406

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 906

1 Year

rr_AverageAnnualReturnYear01

8.16%

5 Years

rr_AverageAnnualReturnYear05

4.31%

10 Years

rr_AverageAnnualReturnYear10

4.33%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Conservative Portfolio | Class R

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.10%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.20%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.50%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.30%

^[3]

1 year

rr_ExpenseExampleYear01

$ 132

3 years

rr_ExpenseExampleYear03

412

5 years

rr_ExpenseExampleYear05

713

10 years

rr_ExpenseExampleYear10

1,568

1 year

rr_ExpenseExampleNoRedemptionYear01

132

3 years

rr_ExpenseExampleNoRedemptionYear03

412

5 years

rr_ExpenseExampleNoRedemptionYear05

713

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,568

1 Year

rr_AverageAnnualReturnYear01

7.58%

5 Years

rr_AverageAnnualReturnYear05

3.73%

10 Years

rr_AverageAnnualReturnYear10

3.93%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Capital Allocation Conservative Portfolio | returns after taxes on distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.90%

5 Years

rr_AverageAnnualReturnYear05

1.59%

10 Years

rr_AverageAnnualReturnYear10

2.43%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Conservative Portfolio | returns after taxes on distributions and sale of Fund shares | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.68%

5 Years

rr_AverageAnnualReturnYear05

1.89%

10 Years

rr_AverageAnnualReturnYear10

2.48%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Conservative Portfolio | Blended Benchmark (consisting of 66% Bloomberg Barclays U.S. Aggregate Bond Index, 15% Russell 3000 Index, 10% FTSE Three-Month U.S. Treasury Bill Index, 5% MSCI EAFE Index (Net) and 4% Bloomberg Barclays U.S. Corporate High-Yield Index) (reflects reinvested dividends net of withholding taxes on the MSCI EAFE Index portion of the Blended Benchmark, and for all indexes reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.93%

5 Years

rr_AverageAnnualReturnYear05

4.37%

10 Years

rr_AverageAnnualReturnYear10

4.61%

Columbia Capital Allocation Conservative Portfolio | Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.54%

5 Years

rr_AverageAnnualReturnYear05

2.10%

10 Years

rr_AverageAnnualReturnYear10

4.01%

Columbia Capital Allocation Conservative Portfolio | Russell 3000 Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

21.13%

5 Years

rr_AverageAnnualReturnYear05

15.58%

10 Years

rr_AverageAnnualReturnYear10

8.60%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[3] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[4] Year to Date return as of March 31, 2018: -1.13%

[5] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

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Columbia Capital Allocation Moderate Portfolio

SUMMARY OF COLUMBIA CAPITAL ALLOCATION MODERATE PORTFOLIO

Investment Objective

Columbia Capital Allocation Moderate Portfolio (Moderate Portfolio or the Fund) is designed for investors seeking the highest level of total return that is consistent with a moderate level of risk.

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. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees - Columbia Capital Allocation Moderate Portfolio	Class A		Class C		Class Adv	Class Inst	Class Inst2	Class Inst3	Class R
Maximum sales charge (load) imposed on purchases (as a % of offering price)	5.75%		none		none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	1.00%	[1]	1.00%	[2]	none	none	none	none	none

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

Annual Fund Operating Expenses - Columbia Capital Allocation Moderate Portfolio		Class A	Class Adv	Class C	Class Inst	Class Inst2	Class Inst3	Class R
Management fees		0.07%	0.07%	0.07%	0.07%	0.07%	0.07%	0.07%
Distribution and/or service (12b-1) fees		0.25%	none	1.00%	none	none	none	0.50%
Other expenses	[1]	0.11%	0.11%	0.11%	0.11%	0.09%	0.05%	0.11%
Acquired fund fees and expenses		0.64%	0.64%	0.64%	0.64%	0.64%	0.64%	0.64%
Total annual Fund operating expenses	[2]	1.07%	0.82%	1.82%	0.82%	0.80%	0.76%	1.32%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example - Columbia Capital Allocation Moderate Portfolio - USD ($)	1 year	3 years	5 years	10 years
Class A	678	896	1,131	1,806
Class Adv	84	262	455	1,014
Class C	285	573	985	2,137
Class Inst	84	262	455	1,014
Class Inst2	82	255	444	990
Class Inst3	78	243	422	942
Class R	134	418	723	1,590

Expense Example, No Redemption - Columbia Capital Allocation Moderate Portfolio - USD ($)	1 year	3 years	5 years	10 years
Class A	678	896	1,131	1,806
Class Adv	84	262	455	1,014
Class C	185	573	985	2,137
Class Inst	84	262	455	1,014
Class Inst2	82	255	444	990
Class Inst3	78	243	422	942
Class R	134	418	723	1,590

Portfolio Turnover

The Fund and underlying funds (including exchange-traded funds (ETFs)) may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 9% of the average value of its portfolio.

Principal Investment Strategies

The Fund is primarily managed as a fund that invests in other funds (i.e., a “fund-of-funds”) that seeks to achieve its investment objective by investing under normal circumstances in a combination of underlying funds for which Columbia Management Investment Advisers, LLC (the Investment Manager) or an affiliate serves as investment adviser or principal underwriter (the affiliated underlying funds). The Fund may also invest up to 20% of its net assets in other funds, including third party advised (unaffiliated) funds and exchange-traded funds (ETFs) (collectively with the affiliated underlying funds, the Underlying Funds), equity securities, fixed income securities (including treasury inflation protected securities (TIPS)) and derivative instruments (the 20% Sleeve). The Fund’s derivative investments may include forward contracts (including forward foreign currency contracts), futures (including currency, equity, index, interest rate, and other bond futures) and options. Derivative positions may be established to seek incremental earnings, hedge existing positions, increase market or credit exposure, increase investment flexibility (including using the derivative position as a substitute for the purchase or sale of the underlying security, currency or other instrument) and/or to change the effective duration of the Fund’s portfolio. Collectively, these investments (including through investments in derivatives) provide the Fund with exposure to equity, fixed income, and cash/cash equivalent asset classes. The Fund may also pursue alternative investment strategies (alternative strategies), including those that seek investment returns uncorrelated to the broad equity and fixed income markets, as well as those providing exposure to other markets, including but not limited to absolute (positive) return strategies.

The Fund may invest in Underlying Funds categorized as “fixed income”, “equity”, “cash/cash equivalents”, and “alternative strategies”, which may represent indirect investments in various sectors, asset classes, strategies and markets. Under normal circumstances, the Fund emphasizes investments in Underlying Funds categorized as fixed income, which can include those that invest in TIPs, U.S. treasury bonds and notes, mortgage-backed and asset-backed securities, investment grade corporate bonds, high yield bonds (junk bonds), high yield loans and international bonds (including those of issuers in developed and emerging markets), which may have varying interest rates, terms, duration and credit exposure. The Fund may also invest in Underlying Funds categorized as equity, which can include those that invest in equity securities representing different investment styles (e.g., growth, value and core/blend), market capitalizations (large-, mid- and small-cap), geographic focus (domestic and international, including emerging markets) and sector focus (e.g., real estate, technology, infrastructure and natural resources).
The Underlying Funds categorized as alternative strategies include those that employ a variety of investment strategies, techniques and practices, generally intended to have a low correlation to the performance of the broad equity and fixed income markets over a complete market cycle including but not limited to absolute (positive) return strategies. Subject to the 20% Sleeve limitation described above, the Fund may also invest directly in equity securities, fixed income securities and derivative instruments, including forward foreign currency contracts and futures (including currency, equity, fixed income, index and interest rate futures). By investing in a combination of Underlying Funds and other securities described in the 20% Sleeve, the Fund seeks to minimize the risks typically associated with investing in a traditional mutual fund.

Under normal market circumstances, the Fund may invest, directly or indirectly, in each of equity, fixed income and cash/cash equivalent asset classes and alternative strategies (each, an asset class category and collectively, the asset class categories) within the following target asset allocation ranges (includes investments in Underlying Funds and the other securities described in the 20% Sleeve):

Asset Class Exposures
	Equity	Fixed Income	Cash/Cash Equivalents	Alternatives
Moderate Portfolio	10–70%*	30–75%*	0–40%*	0–40%*

* As a percent of Fund net assets. Ranges include the net notional amounts of a Fund’s direct investments in derivative instruments. Market appreciation or depreciation may cause a Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only with the approval of a Fund’s Board of Trustees (the Board).

The Fund may be most appropriate for investors with an intermediate term investment horizon.

Principal Risks

An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a transaction in a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations. As a result, the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that the value of loans or other debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including certain Rule 144A eligible securities. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. The Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Forward Contracts Risk. A forward contract is an over-the-counter derivative transaction between two parties to buy or sell a specified amount of an underlying reference at a specified price (or rate) on a specified date in the future. Forward contracts are negotiated on an individual basis and are not standardized or traded on exchanges. The market for forward contracts is substantially unregulated and can experience lengthy periods of illiquidity, unusually high trading volume and other negative impacts, such as political intervention, which may result in volatility or disruptions in such markets. A relatively small price movement in a forward contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. Forward contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, it is possible that the Fund may employ a high degree of leverage in the portfolio. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Futures contracts executed (if any) on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Options Risk. Options are derivatives that give the purchaser the option to buy (call) or sell (put) an underlying reference from or to a counterparty at a specified price (the strike price) on or before an expiration date. By investing in options, the Fund is exposed to the risk that it may be required to buy or sell the underlying reference at a disadvantageous price on or before the expiration date. Options may involve economic leverage, which could result in greater volatility in price movement. The Fund's losses could be significant, and are potentially unlimited for certain types of options. Options may be traded on a securities exchange or in the over-the-counter market. At or prior to maturity of an options contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in options prices. Options can increase the Fund’s risk exposure to underlying references and their attendant risks such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Performance Information

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Year by Year Total Return (%)
as of December 31 Each Year

Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          2nd Quarter 2009                                                         12.51%

Worst                                                        4th Quarter 2008                                                         -12.52%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Average Annual Total Returns - Columbia Capital Allocation Moderate Portfolio	Share Class Inception Date	1 Year	5 Years	10 Years
Class A	Mar. 04, 2004	8.26%	6.61%	5.15%
Class A | returns after taxes on distributions	Mar. 04, 2004	6.31%	4.58%	3.71%
Class A | returns after taxes on distributions and sale of Fund shares	Mar. 04, 2004	5.64%	4.68%	3.64%
Class Adv	Jun. 13, 2013	15.13%	8.12%	5.90%
Class C	Mar. 04, 2004	13.03%	7.07%	4.98%
Class Inst	Sep. 27, 2010	15.17%	8.14%	5.96%
Class Inst2	Jun. 13, 2013	15.18%	8.19%	5.93%
Class Inst3	Jun. 13, 2013	15.24%	8.25%	5.96%
Class R	Sep. 27, 2010	14.62%	7.59%	5.51%
Blended Benchmark (consisting of 42.5% Bloomberg Barclays U.S. Aggregate Bond Index, 37% Russell 3000 Index, 11% MSCI EAFE Index (Net), 7.5% Bloomberg Barclays U.S. Corporate High-Yield Index and 2% MSCI Emerging Markets Index (Net)) (reflects reinvested dividends net of withholding taxes on the MSCI EAFE Index and the MSCI Emerging Markets Index portion of the Blended Benchmark, and for all indexes reflects no deductions for fees, expenses or other taxes)		13.05%	8.06%	6.09%
Russell 3000 Index (reflects no deductions for fees, expenses or taxes)		21.13%	15.58%	8.60%
Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)		3.54%	2.10%	4.01%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[2] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[1] Year to Date return as of March 31, 2018: -0.88%

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Risk/Return:

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Registrant Name

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Columbia Funds Series Trust II

Prospectus Date

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Jun. 01, 2018

Columbia Capital Allocation Moderate Portfolio

Risk/Return:

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SUMMARY OF COLUMBIA CAPITAL ALLOCATION MODERATE PORTFOLIO

Objective [Heading]

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Investment Objective

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Columbia Capital Allocation Moderate Portfolio (Moderate Portfolio or the Fund) is designed for investors seeking the highest level of total return that is consistent with a moderate level of risk.

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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The Fund and underlying funds (including exchange-traded funds (ETFs)) may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 9% of the average value of its portfolio.

Portfolio Turnover, Rate

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9.00%

Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Expense Breakpoint, Minimum Investment Required [Amount]

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$ 50,000

Expenses Restated to Reflect Current [Text]

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Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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“Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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The Fund is primarily managed as a fund that invests in other funds (i.e., a “fund-of-funds”) that seeks to achieve its investment objective by investing under normal circumstances in a combination of underlying funds for which Columbia Management Investment Advisers, LLC (the Investment Manager) or an affiliate serves as investment adviser or principal underwriter (the affiliated underlying funds). The Fund may also invest up to 20% of its net assets in other funds, including third party advised (unaffiliated) funds and exchange-traded funds (ETFs) (collectively with the affiliated underlying funds, the Underlying Funds), equity securities, fixed income securities (including treasury inflation protected securities (TIPS)) and derivative instruments (the 20% Sleeve). The Fund’s derivative investments may include forward contracts (including forward foreign currency contracts), futures (including currency, equity, index, interest rate, and other bond futures) and options. Derivative positions may be established to seek incremental earnings, hedge existing positions, increase market or credit exposure, increase investment flexibility (including using the derivative position as a substitute for the purchase or sale of the underlying security, currency or other instrument) and/or to change the effective duration of the Fund’s portfolio. Collectively, these investments (including through investments in derivatives) provide the Fund with exposure to equity, fixed income, and cash/cash equivalent asset classes. The Fund may also pursue alternative investment strategies (alternative strategies), including those that seek investment returns uncorrelated to the broad equity and fixed income markets, as well as those providing exposure to other markets, including but not limited to absolute (positive) return strategies.

The Fund may invest in Underlying Funds categorized as “fixed income”, “equity”, “cash/cash equivalents”, and “alternative strategies”, which may represent indirect investments in various sectors, asset classes, strategies and markets. Under normal circumstances, the Fund emphasizes investments in Underlying Funds categorized as fixed income, which can include those that invest in TIPs, U.S. treasury bonds and notes, mortgage-backed and asset-backed securities, investment grade corporate bonds, high yield bonds (junk bonds), high yield loans and international bonds (including those of issuers in developed and emerging markets), which may have varying interest rates, terms, duration and credit exposure. The Fund may also invest in Underlying Funds categorized as equity, which can include those that invest in equity securities representing different investment styles (e.g., growth, value and core/blend), market capitalizations (large-, mid- and small-cap), geographic focus (domestic and international, including emerging markets) and sector focus (e.g., real estate, technology, infrastructure and natural resources).
The Underlying Funds categorized as alternative strategies include those that employ a variety of investment strategies, techniques and practices, generally intended to have a low correlation to the performance of the broad equity and fixed income markets over a complete market cycle including but not limited to absolute (positive) return strategies. Subject to the 20% Sleeve limitation described above, the Fund may also invest directly in equity securities, fixed income securities and derivative instruments, including forward foreign currency contracts and futures (including currency, equity, fixed income, index and interest rate futures). By investing in a combination of Underlying Funds and other securities described in the 20% Sleeve, the Fund seeks to minimize the risks typically associated with investing in a traditional mutual fund.

Under normal market circumstances, the Fund may invest, directly or indirectly, in each of equity, fixed income and cash/cash equivalent asset classes and alternative strategies (each, an asset class category and collectively, the asset class categories) within the following target asset allocation ranges (includes investments in Underlying Funds and the other securities described in the 20% Sleeve):

Asset Class Exposures
	Equity	Fixed Income	Cash/Cash Equivalents	Alternatives
Moderate Portfolio	10–70%*	30–75%*	0–40%*	0–40%*

* As a percent of Fund net assets. Ranges include the net notional amounts of a Fund’s direct investments in derivative instruments. Market appreciation or depreciation may cause a Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only with the approval of a Fund’s Board of Trustees (the Board).

The Fund may be most appropriate for investors with an intermediate term investment horizon.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a transaction in a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations. As a result, the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that the value of loans or other debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including certain Rule 144A eligible securities. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. The Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Forward Contracts Risk. A forward contract is an over-the-counter derivative transaction between two parties to buy or sell a specified amount of an underlying reference at a specified price (or rate) on a specified date in the future. Forward contracts are negotiated on an individual basis and are not standardized or traded on exchanges. The market for forward contracts is substantially unregulated and can experience lengthy periods of illiquidity, unusually high trading volume and other negative impacts, such as political intervention, which may result in volatility or disruptions in such markets. A relatively small price movement in a forward contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. Forward contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, it is possible that the Fund may employ a high degree of leverage in the portfolio. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Futures contracts executed (if any) on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Options Risk. Options are derivatives that give the purchaser the option to buy (call) or sell (put) an underlying reference from or to a counterparty at a specified price (the strike price) on or before an expiration date. By investing in options, the Fund is exposed to the risk that it may be required to buy or sell the underlying reference at a disadvantageous price on or before the expiration date. Options may involve economic leverage, which could result in greater volatility in price movement. The Fund's losses could be significant, and are potentially unlimited for certain types of options. Options may be traded on a securities exchange or in the over-the-counter market. At or prior to maturity of an options contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in options prices. Options can increase the Fund’s risk exposure to underlying references and their attendant risks such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Risk Lose Money [Text]

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There is no assurance that the Fund will achieve its investment objective and you may lose money.

Risk Not Insured Depository Institution [Text]

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An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Bar Chart and Performance Table [Heading]

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Performance Information

Performance Narrative [Text Block]

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The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Performance Information Illustrates Variability of Returns [Text]

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The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

Performance Availability Phone [Text]

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800.345.6611

Performance Availability Website Address [Text]

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columbiathreadneedleus.com

Performance Past Does Not Indicate Future [Text]

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The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.

Bar Chart [Heading]

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Year by Year Total Return (%)
as of December 31 Each Year

Bar Chart Does Not Reflect Sales Loads [Text]

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The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          2nd Quarter 2009                                                         12.51%

Worst                                                        4th Quarter 2008                                                         -12.52%

Performance Table Heading

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Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Performance Table Does Reflect Sales Loads

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The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

Performance Table Uses Highest Federal Rate

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The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes.

Performance Table Not Relevant to Tax Deferred

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In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

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The after-tax returns are shown only for Class A shares and will vary for other share classes.

Columbia Capital Allocation Moderate Portfolio | Class A

Risk/Return:

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Maximum sales charge (load) imposed on purchases (as a % of offering price)

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5.75%

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

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1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.07%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 678

3 years

rr_ExpenseExampleYear03

896

5 years

rr_ExpenseExampleYear05

1,131

10 years

rr_ExpenseExampleYear10

1,806

1 year

rr_ExpenseExampleNoRedemptionYear01

678

3 years

rr_ExpenseExampleNoRedemptionYear03

896

5 years

rr_ExpenseExampleNoRedemptionYear05

1,131

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,806

2008

rr_AnnualReturn2008

(24.39%)

^[4]

2009

rr_AnnualReturn2009

24.89%

^[4]

2010

rr_AnnualReturn2010

13.13%

^[4]

2011

rr_AnnualReturn2011

0.42%

^[4]

2012

rr_AnnualReturn2012

11.85%

^[4]

2013

rr_AnnualReturn2013

13.74%

^[4]

2014

rr_AnnualReturn2014

5.28%

^[4]

2015

rr_AnnualReturn2015

0.31%

^[4]

2016

rr_AnnualReturn2016

5.89%

^[4]

2017

rr_AnnualReturn2017

14.86%

^[4]

Year to Date Return, Label

rr_YearToDateReturnLabel

Year to Date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.88%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Jun. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

12.51%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(12.52%)

1 Year

rr_AverageAnnualReturnYear01

8.26%

5 Years

rr_AverageAnnualReturnYear05

6.61%

10 Years

rr_AverageAnnualReturnYear10

5.15%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Moderate Portfolio | Class Adv

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.82%

^[3]

1 year

rr_ExpenseExampleYear01

$ 84

3 years

rr_ExpenseExampleYear03

262

5 years

rr_ExpenseExampleYear05

455

10 years

rr_ExpenseExampleYear10

1,014

1 year

rr_ExpenseExampleNoRedemptionYear01

84

3 years

rr_ExpenseExampleNoRedemptionYear03

262

5 years

rr_ExpenseExampleNoRedemptionYear05

455

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,014

1 Year

rr_AverageAnnualReturnYear01

15.13%

5 Years

rr_AverageAnnualReturnYear05

8.12%

10 Years

rr_AverageAnnualReturnYear10

5.90%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Moderate Portfolio | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[5]

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.82%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 285

3 years

rr_ExpenseExampleYear03

573

5 years

rr_ExpenseExampleYear05

985

10 years

rr_ExpenseExampleYear10

2,137

1 year

rr_ExpenseExampleNoRedemptionYear01

185

3 years

rr_ExpenseExampleNoRedemptionYear03

573

5 years

rr_ExpenseExampleNoRedemptionYear05

985

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 2,137

1 Year

rr_AverageAnnualReturnYear01

13.03%

5 Years

rr_AverageAnnualReturnYear05

7.07%

10 Years

rr_AverageAnnualReturnYear10

4.98%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Moderate Portfolio | Class Inst

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.82%

^[3]

1 year

rr_ExpenseExampleYear01

$ 84

3 years

rr_ExpenseExampleYear03

262

5 years

rr_ExpenseExampleYear05

455

10 years

rr_ExpenseExampleYear10

1,014

1 year

rr_ExpenseExampleNoRedemptionYear01

84

3 years

rr_ExpenseExampleNoRedemptionYear03

262

5 years

rr_ExpenseExampleNoRedemptionYear05

455

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,014

1 Year

rr_AverageAnnualReturnYear01

15.17%

5 Years

rr_AverageAnnualReturnYear05

8.14%

10 Years

rr_AverageAnnualReturnYear10

5.96%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Capital Allocation Moderate Portfolio | Class Inst2

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.09%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.80%

^[3]

1 year

rr_ExpenseExampleYear01

$ 82

3 years

rr_ExpenseExampleYear03

255

5 years

rr_ExpenseExampleYear05

444

10 years

rr_ExpenseExampleYear10

990

1 year

rr_ExpenseExampleNoRedemptionYear01

82

3 years

rr_ExpenseExampleNoRedemptionYear03

255

5 years

rr_ExpenseExampleNoRedemptionYear05

444

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 990

1 Year

rr_AverageAnnualReturnYear01

15.18%

5 Years

rr_AverageAnnualReturnYear05

8.19%

10 Years

rr_AverageAnnualReturnYear10

5.93%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Moderate Portfolio | Class Inst3

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.05%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.76%

^[3]

1 year

rr_ExpenseExampleYear01

$ 78

3 years

rr_ExpenseExampleYear03

243

5 years

rr_ExpenseExampleYear05

422

10 years

rr_ExpenseExampleYear10

942

1 year

rr_ExpenseExampleNoRedemptionYear01

78

3 years

rr_ExpenseExampleNoRedemptionYear03

243

5 years

rr_ExpenseExampleNoRedemptionYear05

422

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 942

1 Year

rr_AverageAnnualReturnYear01

15.24%

5 Years

rr_AverageAnnualReturnYear05

8.25%

10 Years

rr_AverageAnnualReturnYear10

5.96%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Moderate Portfolio | Class R

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.07%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.64%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.32%

^[3]

1 year

rr_ExpenseExampleYear01

$ 134

3 years

rr_ExpenseExampleYear03

418

5 years

rr_ExpenseExampleYear05

723

10 years

rr_ExpenseExampleYear10

1,590

1 year

rr_ExpenseExampleNoRedemptionYear01

134

3 years

rr_ExpenseExampleNoRedemptionYear03

418

5 years

rr_ExpenseExampleNoRedemptionYear05

723

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,590

1 Year

rr_AverageAnnualReturnYear01

14.62%

5 Years

rr_AverageAnnualReturnYear05

7.59%

10 Years

rr_AverageAnnualReturnYear10

5.51%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Capital Allocation Moderate Portfolio | returns after taxes on distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

6.31%

5 Years

rr_AverageAnnualReturnYear05

4.58%

10 Years

rr_AverageAnnualReturnYear10

3.71%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Moderate Portfolio | returns after taxes on distributions and sale of Fund shares | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.64%

5 Years

rr_AverageAnnualReturnYear05

4.68%

10 Years

rr_AverageAnnualReturnYear10

3.64%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Moderate Portfolio | Blended Benchmark (consisting of 42.5% Bloomberg Barclays U.S. Aggregate Bond Index, 37% Russell 3000 Index, 11% MSCI EAFE Index (Net), 7.5% Bloomberg Barclays U.S. Corporate High-Yield Index and 2% MSCI Emerging Markets Index (Net)) (reflects reinvested dividends net of withholding taxes on the MSCI EAFE Index and the MSCI Emerging Markets Index portion of the Blended Benchmark, and for all indexes reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.05%

5 Years

rr_AverageAnnualReturnYear05

8.06%

10 Years

rr_AverageAnnualReturnYear10

6.09%

Columbia Capital Allocation Moderate Portfolio | Russell 3000 Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

21.13%

5 Years

rr_AverageAnnualReturnYear05

15.58%

10 Years

rr_AverageAnnualReturnYear10

8.60%

Columbia Capital Allocation Moderate Portfolio | Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.54%

5 Years

rr_AverageAnnualReturnYear05

2.10%

10 Years

rr_AverageAnnualReturnYear10

4.01%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[3] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[4] Year to Date return as of March 31, 2018: -0.88%

[5] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

XML

Columbia Capital Allocation Aggressive Portfolio

SUMMARY OF COLUMBIA CAPITAL ALLOCATION AGGRESSIVE PORTFOLIO

Investment Objective

Columbia Capital Allocation Aggressive Portfolio (Aggressive Portfolio or the Fund) is designed for investors seeking the highest level of total return that is consistent with an aggressive level of risk.

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. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees - Columbia Capital Allocation Aggressive Portfolio	Class A		Class C		Class Adv	Class Inst	Class Inst2	Class Inst3	Class R
Maximum sales charge (load) imposed on purchases (as a % of offering price)	5.75%		none		none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	1.00%	[1]	1.00%	[2]	none	none	none	none	none

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

Annual Fund Operating Expenses - Columbia Capital Allocation Aggressive Portfolio		Class A	Class Adv	Class C	Class Inst	Class Inst2	Class Inst3	Class R
Management fees		0.08%	0.08%	0.08%	0.08%	0.08%	0.08%	0.08%
Distribution and/or service (12b-1) fees		0.25%	none	1.00%	none	none	none	0.50%
Other expenses	[1]	0.14%	0.14%	0.14%	0.14%	0.12%	0.06%	0.14%
Acquired fund fees and expenses		0.73%	0.73%	0.73%	0.73%	0.73%	0.73%	0.73%
Total annual Fund operating expenses	[2]	1.20%	0.95%	1.95%	0.95%	0.93%	0.87%	1.45%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example - Columbia Capital Allocation Aggressive Portfolio - USD ($)	1 year	3 years	5 years	10 years
Class A	690	934	1,197	1,946
Class Adv	97	303	525	1,166
Class C	298	612	1,052	2,275
Class Inst	97	303	525	1,166
Class Inst2	95	296	515	1,143
Class Inst3	89	278	482	1,073
Class R	148	459	792	1,735

Expense Example, No Redemption - Columbia Capital Allocation Aggressive Portfolio - USD ($)	1 year	3 years	5 years	10 years
Class A	690	934	1,197	1,946
Class Adv	97	303	525	1,166
Class C	198	612	1,052	2,275
Class Inst	97	303	525	1,166
Class Inst2	95	296	515	1,143
Class Inst3	89	278	482	1,073
Class R	148	459	792	1,735

Portfolio Turnover

The Fund and underlying funds (including exchange-traded funds (ETFs)) may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 13% of the average value of its portfolio.

Principal Investment Strategies

The Fund is primarily managed as a fund that invests in other funds (i.e., a “fund-of-funds”) that seeks to achieve its investment objective by investing under normal circumstances in a combination of underlying funds for which Columbia Management Investment Advisers, LLC (the Investment Manager) or an affiliate serves as investment adviser or principal underwriter (the affiliated underlying funds). The Fund may also invest up to 20% of its net assets in other funds, including third party advised (unaffiliated) funds and exchange-traded funds (ETFs) (collectively with the affiliated underlying funds, the Underlying Funds), equity securities, fixed income securities (including treasury inflation protected securities (TIPS)) and derivative instruments (the 20% Sleeve). The Fund’s derivative investments may include forward contracts (including forward foreign currency contracts), futures (including currency, equity, index, interest rate, and other bond futures) and options. Derivative positions may be established to seek incremental earnings, hedge existing positions, increase market or credit exposure, increase investment flexibility (including using the derivative position as a substitute for the purchase or sale of the underlying security, currency or other instrument) and/or to change the effective duration of the Fund’s portfolio. Collectively, these investments (including through investments in derivatives) provide the Fund with exposure to equity, fixed income, and cash/cash equivalent asset classes. The Fund may also pursue alternative investment strategies (alternative strategies), including those that seek investment returns uncorrelated to the broad equity and fixed income markets, as well as those providing exposure to other markets, including but not limited to absolute (positive) return strategies.

The Fund may invest in Underlying Funds categorized as “equity”, “fixed income”, “cash/cash equivalents”, and “alternative strategies”, which may represent indirect investments in various sectors, asset classes, strategies and markets. Under normal circumstances, the Fund emphasizes investments in Underlying Funds categorized as equity, which can include those that invest in equity securities representing different investment styles (e.g., growth, value and core/blend), market capitalizations (large-, mid- and small-cap), geographic focus (domestic and international, including emerging markets) and sector focus (e.g., real estate, technology, infrastructure and natural resources). The Fund may also invest in Underlying Funds categorized as fixed income, which can include those investing in TIPs, U.S. treasury bonds and notes, mortgage-backed and asset-backed securities, investment grade corporate bonds, high yield bonds (junk bonds), high yield loans and international bonds (including those of issuers in developed and emerging markets), which may have varying interest rates, terms, duration and credit exposure. The Underlying Funds categorized as alternative strategies include those that employ a variety of investment strategies, techniques and practices, generally intended to have a low correlation to the performance of the broad equity and fixed income markets over a complete market cycle including but not limited to absolute (positive) return strategies. Subject to the 20% Sleeve limitation described above, the Fund may also invest directly in equity securities, fixed income securities and derivative instruments, including forward foreign currency contracts and futures (including currency, equity, fixed income, index and interest rate futures). By investing in a combination of Underlying Funds and other securities described in the 20% Sleeve, the Fund seeks to minimize the risks typically associated with investing in a traditional mutual fund.

Under normal market circumstances, the Fund may invest, directly or indirectly, in each of equity, fixed income and cash/cash equivalent asset classes and alternative strategies (each, an asset class category and collectively, the asset class categories) within the following target asset allocation ranges (includes investments in Underlying Funds and the other securities described in the 20% Sleeve):

Asset Class Exposures*
	Equity	Fixed Income	Cash/Cash Equivalents	Alternatives
Aggressive Portfolio	25–100%*	0–50%*	0–40%*	0–40%*

* As a percent of Fund net assets. Ranges include the net notional amounts of a Fund’s direct investments in derivative instruments. Market appreciation or depreciation may cause a Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only with the approval of a Fund’s Board of Trustees (the Board).

The Fund may be most appropriate for investors with a longer-term investment horizon.

Principal Risks

An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a transaction in a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations. As a result, the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that the value of loans or other debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including certain Rule 144A eligible securities. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. The Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Forward Contracts Risk. A forward contract is an over-the-counter derivative transaction between two parties to buy or sell a specified amount of an underlying reference at a specified price (or rate) on a specified date in the future. Forward contracts are negotiated on an individual basis and are not standardized or traded on exchanges. The market for forward contracts is substantially unregulated and can experience lengthy periods of illiquidity, unusually high trading volume and other negative impacts, such as political intervention, which may result in volatility or disruptions in such markets. A relatively small price movement in a forward contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. Forward contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, it is possible that the Fund may employ a high degree of leverage in the portfolio. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Futures contracts executed (if any) on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Options Risk. Options are derivatives that give the purchaser the option to buy (call) or sell (put) an underlying reference from or to a counterparty at a specified price (the strike price) on or before an expiration date. By investing in options, the Fund is exposed to the risk that it may be required to buy or sell the underlying reference at a disadvantageous price on or before the expiration date. Options may involve economic leverage, which could result in greater volatility in price movement. The Fund's losses could be significant, and are potentially unlimited for certain types of options. Options may be traded on a securities exchange or in the over-the-counter market. At or prior to maturity of an options contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in options prices. Options can increase the Fund’s risk exposure to underlying references and their attendant risks such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Performance Information

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Year by Year Total Return (%)
as of December 31 Each Year

Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          3rd Quarter 2009                                                         16.33%

Worst                                                        4th Quarter 2008                                                        -19.00%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Average Annual Total Returns - Columbia Capital Allocation Aggressive Portfolio	Share Class Inception Date	1 Year	5 Years	10 Years
Class A	Mar. 04, 2004	15.30%	9.75%	5.53%
Class A | returns after taxes on distributions	Mar. 04, 2004	13.10%	7.71%	4.31%
Class A | returns after taxes on distributions and sale of Fund shares	Mar. 04, 2004	10.01%	7.08%	4.01%
Class Adv	Jun. 13, 2013	22.55%	11.30%	6.28%
Class C	Mar. 04, 2004	20.29%	10.22%	5.36%
Class Inst	Sep. 27, 2010	22.58%	11.33%	6.36%
Class Inst2	Jun. 13, 2013	22.61%	11.39%	6.32%
Class Inst3	Jun. 13, 2013	22.78%	11.45%	6.35%
Class R	Sep. 27, 2010	22.04%	10.79%	5.92%
Blended Benchmark (consisting of 60% Russell 3000 Index, 15% Bloomberg Barclays U.S. Aggregate Bond Index, 14% MSCI EAFE Index (Net), 6% MSCI Emerging Markets Index (Net) and 5% Bloomberg Barclays U.S. Corporate High-Yield Index) (reflects reinvested dividends net of withholding taxes on the MSCI EAFE Index and the MSCI Emerging Markets Index portion of the Blended Benchmark, and for all indexes reflects no deductions for fees, expenses or other taxes)		19.09%	11.34%	6.79%
Russell 3000 Index (reflects no deductions for fees, expenses or taxes)		21.13%	15.58%	8.60%
Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)		3.54%	2.10%	4.01%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[2] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[1] Year to Date return as of March 31, 2018: -0.52%

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Label

Element

Value

Risk/Return:

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Registrant Name

dei_EntityRegistrantName

Columbia Funds Series Trust II

Prospectus Date

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Jun. 01, 2018

Columbia Capital Allocation Aggressive Portfolio

Risk/Return:

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Risk/Return [Heading]

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SUMMARY OF COLUMBIA CAPITAL ALLOCATION AGGRESSIVE PORTFOLIO

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

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Columbia Capital Allocation Aggressive Portfolio (Aggressive Portfolio or the Fund) is designed for investors seeking the highest level of total return that is consistent with an aggressive level of risk.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

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This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees Caption [Text]

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Shareholder Fees (fees paid directly from your investment)

Operating Expenses Caption [Text]

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

Portfolio Turnover [Heading]

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Portfolio Turnover

Portfolio Turnover [Text Block]

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The Fund and underlying funds (including exchange-traded funds (ETFs)) may pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A higher portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 13% of the average value of its portfolio.

Portfolio Turnover, Rate

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13.00%

Expense Breakpoint Discounts [Text]

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You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 71 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Expense Breakpoint, Minimum Investment Required [Amount]

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$ 50,000

Expenses Restated to Reflect Current [Text]

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Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

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“Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

Expense Example [Heading]

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Example

Expense Example Narrative [Text Block]

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The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Strategy [Heading]

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Principal Investment Strategies

Strategy Narrative [Text Block]

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The Fund is primarily managed as a fund that invests in other funds (i.e., a “fund-of-funds”) that seeks to achieve its investment objective by investing under normal circumstances in a combination of underlying funds for which Columbia Management Investment Advisers, LLC (the Investment Manager) or an affiliate serves as investment adviser or principal underwriter (the affiliated underlying funds). The Fund may also invest up to 20% of its net assets in other funds, including third party advised (unaffiliated) funds and exchange-traded funds (ETFs) (collectively with the affiliated underlying funds, the Underlying Funds), equity securities, fixed income securities (including treasury inflation protected securities (TIPS)) and derivative instruments (the 20% Sleeve). The Fund’s derivative investments may include forward contracts (including forward foreign currency contracts), futures (including currency, equity, index, interest rate, and other bond futures) and options. Derivative positions may be established to seek incremental earnings, hedge existing positions, increase market or credit exposure, increase investment flexibility (including using the derivative position as a substitute for the purchase or sale of the underlying security, currency or other instrument) and/or to change the effective duration of the Fund’s portfolio. Collectively, these investments (including through investments in derivatives) provide the Fund with exposure to equity, fixed income, and cash/cash equivalent asset classes. The Fund may also pursue alternative investment strategies (alternative strategies), including those that seek investment returns uncorrelated to the broad equity and fixed income markets, as well as those providing exposure to other markets, including but not limited to absolute (positive) return strategies.

The Fund may invest in Underlying Funds categorized as “equity”, “fixed income”, “cash/cash equivalents”, and “alternative strategies”, which may represent indirect investments in various sectors, asset classes, strategies and markets. Under normal circumstances, the Fund emphasizes investments in Underlying Funds categorized as equity, which can include those that invest in equity securities representing different investment styles (e.g., growth, value and core/blend), market capitalizations (large-, mid- and small-cap), geographic focus (domestic and international, including emerging markets) and sector focus (e.g., real estate, technology, infrastructure and natural resources). The Fund may also invest in Underlying Funds categorized as fixed income, which can include those investing in TIPs, U.S. treasury bonds and notes, mortgage-backed and asset-backed securities, investment grade corporate bonds, high yield bonds (junk bonds), high yield loans and international bonds (including those of issuers in developed and emerging markets), which may have varying interest rates, terms, duration and credit exposure. The Underlying Funds categorized as alternative strategies include those that employ a variety of investment strategies, techniques and practices, generally intended to have a low correlation to the performance of the broad equity and fixed income markets over a complete market cycle including but not limited to absolute (positive) return strategies. Subject to the 20% Sleeve limitation described above, the Fund may also invest directly in equity securities, fixed income securities and derivative instruments, including forward foreign currency contracts and futures (including currency, equity, fixed income, index and interest rate futures). By investing in a combination of Underlying Funds and other securities described in the 20% Sleeve, the Fund seeks to minimize the risks typically associated with investing in a traditional mutual fund.

Under normal market circumstances, the Fund may invest, directly or indirectly, in each of equity, fixed income and cash/cash equivalent asset classes and alternative strategies (each, an asset class category and collectively, the asset class categories) within the following target asset allocation ranges (includes investments in Underlying Funds and the other securities described in the 20% Sleeve):

Asset Class Exposures*
	Equity	Fixed Income	Cash/Cash Equivalents	Alternatives
Aggressive Portfolio	25–100%*	0–50%*	0–40%*	0–40%*

* As a percent of Fund net assets. Ranges include the net notional amounts of a Fund’s direct investments in derivative instruments. Market appreciation or depreciation may cause a Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only with the approval of a Fund’s Board of Trustees (the Board).

The Fund may be most appropriate for investors with a longer-term investment horizon.

Risk [Heading]

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Principal Risks

Risk Narrative [Text Block]

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An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Counterparty Risk. Counterparty risk is the risk that a counterparty to a transaction in a financial instrument held by the Fund or by a special purpose or structured vehicle invested in by the Fund may become insolvent or otherwise fail to perform its obligations. As a result, the Fund may obtain no or limited recovery of its investment, and any recovery may be significantly delayed.

Credit Risk. Credit risk is the risk that the value of loans or other debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Derivatives Risk. Derivatives may involve significant risks. Derivatives are financial instruments with a value in relation to, or derived from, the value of an underlying asset(s) or other reference, such as an index, rate or other economic indicator (each an underlying reference). Derivatives may include those that are privately placed or otherwise exempt from SEC registration, including certain Rule 144A eligible securities. Derivatives could result in Fund losses if the underlying reference does not perform as anticipated. Use of derivatives is a highly specialized activity that can involve investment techniques, risks, and tax planning different from those associated with more traditional investment instruments. The Fund’s derivatives strategy may not be successful and use of certain derivatives could result in substantial, potentially unlimited, losses to the Fund regardless of the Fund’s actual investment. A relatively small movement in the price, rate or other economic indicator associated with the underlying reference may result in substantial loss for the Fund. Derivatives may be more volatile than other types of investments. The value of derivatives may be influenced by a variety of factors, including national and international political and economic developments. Potential changes to the regulation of the derivatives markets may make derivatives more costly, may limit the market for derivatives, or may otherwise adversely affect the value or performance of derivatives. Derivatives can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Forward Contracts Risk. A forward contract is an over-the-counter derivative transaction between two parties to buy or sell a specified amount of an underlying reference at a specified price (or rate) on a specified date in the future. Forward contracts are negotiated on an individual basis and are not standardized or traded on exchanges. The market for forward contracts is substantially unregulated and can experience lengthy periods of illiquidity, unusually high trading volume and other negative impacts, such as political intervention, which may result in volatility or disruptions in such markets. A relatively small price movement in a forward contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. Forward contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Futures Contracts Risk. A futures contract is an exchange-traded derivative transaction between two parties in which a buyer (holding the “long” position) agrees to pay a fixed price (or rate) at a specified future date for delivery of an underlying reference from a seller (holding the “short” position). The seller hopes that the market price on the delivery date is less than the agreed upon price, while the buyer hopes for the contrary. Certain futures contract markets are highly volatile, and futures contracts may be illiquid. Futures exchanges may limit fluctuations in futures contract prices by imposing a maximum permissible daily price movement. The Fund may be disadvantaged if it is prohibited from executing a trade outside the daily permissible price movement. At or prior to maturity of a futures contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in futures contract prices. The liquidity of the futures markets depends on participants entering into offsetting transactions rather than making or taking delivery. To the extent participants make or take delivery, liquidity in the futures market could be reduced. Because of the low margin deposits normally required in futures trading, it is possible that the Fund may employ a high degree of leverage in the portfolio. As a result, a relatively small price movement in a futures contract may result in substantial losses to the Fund, exceeding the amount of the margin paid. For certain types of futures contracts, losses are potentially unlimited. Futures markets are highly volatile and the use of futures may increase the volatility of the Fund’s NAV. Futures contracts executed (if any) on foreign exchanges may not provide the same protection as U.S. exchanges. Futures contracts can increase the Fund’s risk exposure to underlying references and their attendant risks, such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Derivatives Risk – Options Risk. Options are derivatives that give the purchaser the option to buy (call) or sell (put) an underlying reference from or to a counterparty at a specified price (the strike price) on or before an expiration date. By investing in options, the Fund is exposed to the risk that it may be required to buy or sell the underlying reference at a disadvantageous price on or before the expiration date. Options may involve economic leverage, which could result in greater volatility in price movement. The Fund's losses could be significant, and are potentially unlimited for certain types of options. Options may be traded on a securities exchange or in the over-the-counter market. At or prior to maturity of an options contract, the Fund may enter into an offsetting contract and may incur a loss to the extent there has been adverse movement in options prices. Options can increase the Fund’s risk exposure to underlying references and their attendant risks such as credit risk, market risk, foreign currency risk and interest rate risk, while also exposing the Fund to correlation risk, counterparty risk, hedging risk, leverage risk, liquidity risk, pricing risk and volatility risk.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

Growth Securities Risk. Growth securities typically trade at a higher multiple of earnings than other types of equity securities. Accordingly, the market values of growth securities may never reach their expected market value and may decline in price. In addition, growth securities, at times, may not perform as well as value securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Inflation-Protected Securities Risk. Inflation-protected debt securities tend to react to changes in real interest rates (i.e., nominal interest rates minus the expected impact of inflation). In general, the price of such securities falls when real interest rates rise, and rises when real interest rates fall. Interest payments on these securities will vary and may be more volatile than interest paid on ordinary bonds. In periods of deflation, the Fund may have no income at all from such investments.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Small- and Mid-Cap Company Securities Risk. Investments in small- and mid-capitalization companies (small- and mid-cap companies) often involve greater risks than investments in larger, more established companies (larger companies) because small- and mid-cap companies tend to have less predictable earnings and may lack the management experience, financial resources, product diversification and competitive strengths of larger companies. Securities of small- and mid-cap companies may be less liquid and more volatile than the securities of larger companies.

Value Securities Risk. Value securities are securities of companies that may have experienced, for example, adverse business, industry or other developments or may be subject to special risks that have caused the securities to be out of favor and, in turn, potentially undervalued. The market value of a portfolio security may not meet portfolio management’s perceived value assessment of that security, or may decline in price, even though portfolio management believes the securities are already undervalued. There is also a risk that it may take longer than expected for the value of these investments to rise to portfolio management’s perceived value. In addition, value securities, at times, may not perform as well as growth securities or the stock market in general, and may be out of favor with investors for varying periods of time.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is no assurance that the Fund will achieve its investment objective and you may lose money.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a bank deposit 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 show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

columbiathreadneedleus.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Year by Year Total Return (%)
as of December 31 Each Year

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

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Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          3rd Quarter 2009                                                         16.33%

Worst                                                        4th Quarter 2008                                                        -19.00%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategy, as well as two additional measures of performance for markets in which the Fund may invest.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Class A shares and will vary for other share classes.

Columbia Capital Allocation Aggressive Portfolio | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

5.75%

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.14%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.20%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 690

3 years

rr_ExpenseExampleYear03

934

5 years

rr_ExpenseExampleYear05

1,197

10 years

rr_ExpenseExampleYear10

1,946

1 year

rr_ExpenseExampleNoRedemptionYear01

690

3 years

rr_ExpenseExampleNoRedemptionYear03

934

5 years

rr_ExpenseExampleNoRedemptionYear05

1,197

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,946

2008

rr_AnnualReturn2008

(35.62%)

^[4]

2009

rr_AnnualReturn2009

29.82%

^[4]

2010

rr_AnnualReturn2010

15.90%

^[4]

2011

rr_AnnualReturn2011

(3.00%)

^[4]

2012

rr_AnnualReturn2012

14.55%

^[4]

2013

rr_AnnualReturn2013

22.54%

^[4]

2014

rr_AnnualReturn2014

5.73%

^[4]

2015

rr_AnnualReturn2015

0.35%

^[4]

2016

rr_AnnualReturn2016

6.25%

^[4]

2017

rr_AnnualReturn2017

22.31%

^[4]

Year to Date Return, Label

rr_YearToDateReturnLabel

Year to Date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.52%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

16.33%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(19.00%)

1 Year

rr_AverageAnnualReturnYear01

15.30%

5 Years

rr_AverageAnnualReturnYear05

9.75%

10 Years

rr_AverageAnnualReturnYear10

5.53%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Aggressive Portfolio | Class Adv

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.14%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.95%

^[3]

1 year

rr_ExpenseExampleYear01

$ 97

3 years

rr_ExpenseExampleYear03

303

5 years

rr_ExpenseExampleYear05

525

10 years

rr_ExpenseExampleYear10

1,166

1 year

rr_ExpenseExampleNoRedemptionYear01

97

3 years

rr_ExpenseExampleNoRedemptionYear03

303

5 years

rr_ExpenseExampleNoRedemptionYear05

525

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,166

1 Year

rr_AverageAnnualReturnYear01

22.55%

5 Years

rr_AverageAnnualReturnYear05

11.30%

10 Years

rr_AverageAnnualReturnYear10

6.28%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Aggressive Portfolio | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[5]

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.14%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.95%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 298

3 years

rr_ExpenseExampleYear03

612

5 years

rr_ExpenseExampleYear05

1,052

10 years

rr_ExpenseExampleYear10

2,275

1 year

rr_ExpenseExampleNoRedemptionYear01

198

3 years

rr_ExpenseExampleNoRedemptionYear03

612

5 years

rr_ExpenseExampleNoRedemptionYear05

1,052

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 2,275

1 Year

rr_AverageAnnualReturnYear01

20.29%

5 Years

rr_AverageAnnualReturnYear05

10.22%

10 Years

rr_AverageAnnualReturnYear10

5.36%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Aggressive Portfolio | Class Inst

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.14%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.95%

^[3]

1 year

rr_ExpenseExampleYear01

$ 97

3 years

rr_ExpenseExampleYear03

303

5 years

rr_ExpenseExampleYear05

525

10 years

rr_ExpenseExampleYear10

1,166

1 year

rr_ExpenseExampleNoRedemptionYear01

97

3 years

rr_ExpenseExampleNoRedemptionYear03

303

5 years

rr_ExpenseExampleNoRedemptionYear05

525

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,166

1 Year

rr_AverageAnnualReturnYear01

22.58%

5 Years

rr_AverageAnnualReturnYear05

11.33%

10 Years

rr_AverageAnnualReturnYear10

6.36%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Capital Allocation Aggressive Portfolio | Class Inst2

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.12%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.93%

^[3]

1 year

rr_ExpenseExampleYear01

$ 95

3 years

rr_ExpenseExampleYear03

296

5 years

rr_ExpenseExampleYear05

515

10 years

rr_ExpenseExampleYear10

1,143

1 year

rr_ExpenseExampleNoRedemptionYear01

95

3 years

rr_ExpenseExampleNoRedemptionYear03

296

5 years

rr_ExpenseExampleNoRedemptionYear05

515

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,143

1 Year

rr_AverageAnnualReturnYear01

22.61%

5 Years

rr_AverageAnnualReturnYear05

11.39%

10 Years

rr_AverageAnnualReturnYear10

6.32%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Aggressive Portfolio | Class Inst3

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.06%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.87%

^[3]

1 year

rr_ExpenseExampleYear01

$ 89

3 years

rr_ExpenseExampleYear03

278

5 years

rr_ExpenseExampleYear05

482

10 years

rr_ExpenseExampleYear10

1,073

1 year

rr_ExpenseExampleNoRedemptionYear01

89

3 years

rr_ExpenseExampleNoRedemptionYear03

278

5 years

rr_ExpenseExampleNoRedemptionYear05

482

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,073

1 Year

rr_AverageAnnualReturnYear01

22.78%

5 Years

rr_AverageAnnualReturnYear05

11.45%

10 Years

rr_AverageAnnualReturnYear10

6.35%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 13, 2013

Columbia Capital Allocation Aggressive Portfolio | Class R

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.08%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.14%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.73%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.45%

^[3]

1 year

rr_ExpenseExampleYear01

$ 148

3 years

rr_ExpenseExampleYear03

459

5 years

rr_ExpenseExampleYear05

792

10 years

rr_ExpenseExampleYear10

1,735

1 year

rr_ExpenseExampleNoRedemptionYear01

148

3 years

rr_ExpenseExampleNoRedemptionYear03

459

5 years

rr_ExpenseExampleNoRedemptionYear05

792

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,735

1 Year

rr_AverageAnnualReturnYear01

22.04%

5 Years

rr_AverageAnnualReturnYear05

10.79%

10 Years

rr_AverageAnnualReturnYear10

5.92%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Capital Allocation Aggressive Portfolio | returns after taxes on distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.10%

5 Years

rr_AverageAnnualReturnYear05

7.71%

10 Years

rr_AverageAnnualReturnYear10

4.31%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Aggressive Portfolio | returns after taxes on distributions and sale of Fund shares | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

10.01%

5 Years

rr_AverageAnnualReturnYear05

7.08%

10 Years

rr_AverageAnnualReturnYear10

4.01%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 04, 2004

Columbia Capital Allocation Aggressive Portfolio | Blended Benchmark (consisting of 60% Russell 3000 Index, 15% Bloomberg Barclays U.S. Aggregate Bond Index, 14% MSCI EAFE Index (Net), 6% MSCI Emerging Markets Index (Net) and 5% Bloomberg Barclays U.S. Corporate High-Yield Index) (reflects reinvested dividends net of withholding taxes on the MSCI EAFE Index and the MSCI Emerging Markets Index portion of the Blended Benchmark, and for all indexes reflects no deductions for fees, expenses or other taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

19.09%

5 Years

rr_AverageAnnualReturnYear05

11.34%

10 Years

rr_AverageAnnualReturnYear10

6.79%

Columbia Capital Allocation Aggressive Portfolio | Russell 3000 Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

21.13%

5 Years

rr_AverageAnnualReturnYear05

15.58%

10 Years

rr_AverageAnnualReturnYear10

8.60%

Columbia Capital Allocation Aggressive Portfolio | Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.54%

5 Years

rr_AverageAnnualReturnYear05

2.10%

10 Years

rr_AverageAnnualReturnYear10

4.01%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[3] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[4] Year to Date return as of March 31, 2018: -0.52%

[5] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

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Columbia Income Builder Fund

SUMMARY OF THE FUND

Investment Objective

Columbia Income Builder Fund (the Fund) seeks to provide shareholders with a high level of current income and growth of capital.

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. The front-end sales charge applicable to Class T shares is a per-transaction charge, meaning that separate orders will not be aggregated for purposes of calculating the rate of the sales charge payable. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 26 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees (fees paid directly from your investment)

Shareholder Fees - Columbia Income Builder Fund	Class A		Class C		Class T	Class Adv	Class Inst	Class Inst2	Class Inst3	Class R
Maximum sales charge (load) imposed on purchases (as a % of offering price)	4.75%		none		2.50%	none	none	none	none	none
Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)	1.00%	[1]	1.00%	[2]	none	none	none	none	none	none

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

Annual Fund Operating Expenses - Columbia Income Builder Fund		Class A	Class Adv	Class C	Class Inst	Class Inst2	Class Inst3	Class R	Class T
Management fees		0.02%	0.02%	0.02%	0.02%	0.02%	0.02%	0.02%	0.02%
Distribution and/or service (12b-1) fees		0.25%	none	1.00%	none	none	none	0.50%	0.25%
Other expenses	[1]	0.11%	0.11%	0.11%	0.11%	0.10%	0.04%	0.11%	0.11%
Acquired fund fees and expenses		0.62%	0.62%	0.62%	0.62%	0.62%	0.62%	0.62%	0.62%
Total annual Fund operating expenses	[2]	1.00%	0.75%	1.75%	0.75%	0.74%	0.68%	1.25%	1.00%

Example

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Expense Example - Columbia Income Builder Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	572	778	1,001	1,641
Class Adv	77	240	417	930
Class C	278	551	949	2,062
Class Inst	77	240	417	930
Class Inst2	76	237	411	918
Class Inst3	69	218	379	847
Class R	127	397	686	1,511
Class T	349	560	789	1,444

Expense Example, No Redemption - Columbia Income Builder Fund - USD ($)	1 year	3 years	5 years	10 years
Class A	572	778	1,001	1,641
Class Adv	77	240	417	930
Class C	178	551	949	2,062
Class Inst	77	240	417	930
Class Inst2	76	237	411	918
Class Inst3	69	218	379	847
Class R	127	397	686	1,511
Class T	349	560	789	1,444

Portfolio Turnover

The Fund and underlying funds pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A high portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 13% of the average value of its portfolio.

Principal Investment Strategies

The Fund is a “fund-of-funds” and seeks to achieve its objective by investing in a combination of underlying funds, including mutual funds and exchange-traded funds (ETFs), representing different asset classes, potentially including an allocation to alternative investment strategies. Under normal market conditions, the Fund intends to invest in each asset class within the following target asset allocation ranges:

Table 1 — Asset Class (Target Allocation Range – Under Normal Market Conditions)*
Equity	0–35%
Fixed Income	55–100%
Cash	0–15%
Alternative Investment Strategy	0–20%

* Market appreciation or depreciation may cause the Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only upon approval of the Fund’s Board of Trustees.

Columbia Management Investment Advisers, LLC (the Investment Manager), allocates the Fund’s assets within and across different asset classes through investments in underlying funds, potentially including an allocation to alternative investment strategy funds, in an effort to achieve the Fund’s investment objective of providing a high level of current income and growth of capital. Typically, asset allocation changes will be made monthly to refine the Fund’s positioning, but may be made more or less frequently depending upon then-current allocations.

In pursuit of the Fund’s investment objective, the Investment Manager chooses investments by:

• Evaluating the Fund’s total exposure to sectors, industries, issuers and securities relative to the Fund’s indices;

• Analyzing factors such as credit quality, interest rate outlook and price; and

• Targeting certain underlying funds that invest in lower-quality (junk) bonds and foreign investments as attractive opportunities arise.

The Investment Manager relies on various qualitative and quantitative inputs to tactically allocate the Fund’s assets across the different asset classes and investment categories.

Investment Category Allocation. Within the equity and fixed income asset classes, the Investment Manager establishes allocations for the Fund, seeking to achieve the Fund’s investment objective by investing in defined investment categories. Fixed income investment categories include underlying funds that invest in: treasury inflation protected securities, mortgage- and asset-backed securities, core plus (primarily domestic investment grade bonds), high yield bonds, high yield loans, international bonds and emerging market bonds. The Investment Manager also may allocate assets to money market (cash) or alternative investment strategies. Equity investment categories include underlying funds that invest in: U.S. large cap, mid cap and small cap equities (including growth, value and core/blend styles), international equities (including emerging market securities) and real estate securities. The target allocation range constraints set forth in Table 1 are intended to promote diversification within asset classes, and the Investment Manager takes into account factors such as style, sector, market capitalization, geographic location, credit quality, interest rate outlook, and yield potential. Proposed allocation shifts are reviewed and approved by the Investment Manager as part of its qualitative review.

Principal Risks

An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Changing Distribution Level Risk. The Fund will normally receive income which may include interest, dividends and/or capital gains, depending upon its investments. The amount of the distributions the Fund pays will vary and generally depends on the amount of income the Fund earns (less expenses) on its portfolio holdings, and capital gains or losses it recognizes. A decline in the Fund’s income or net capital gains from its investments may reduce its distribution level.

Credit Risk. Credit risk is the risk that the value of debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Emerging Market Securities Risk. Securities issued by foreign governments or companies in emerging market countries, such as China, Russia and certain countries in Eastern Europe, the Middle East, Asia, Latin America or Africa, are more likely to have greater exposure to the risks of investing in foreign securities that are described in Foreign Securities Risk. In addition, emerging market countries are more likely to experience instability resulting, for example, from rapid changes or developments in social, political, economic or other conditions. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity (i.e., lower trading volumes and less liquidity) than more developed countries. Emerging market securities tend to be more volatile than securities in more developed markets. Many emerging market countries are heavily dependent on international trade and have fewer trading partners, which makes them more sensitive to world commodity prices and economic downturns in other countries, and some have a higher risk of currency devaluations.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities. The performance of the Fund may also be negatively affected by fluctuations in a foreign currency's strength or weakness relative to the U.S. dollar, particularly to the extent the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Debt instruments with floating coupon rates are typically less sensitive to interest rate changes, but these debt instruments may decline in value if their coupon rates do not rise as much as, or keep pace with, yields on such types of debt instruments. Because rates on certain floating rate loans and other debt instruments reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause fluctuations in the Fund’s NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.

Performance Information

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategies, as well as three other measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Year by Year Total Return (%)
as of December 31 Each Year

Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          3rd Quarter 2009                                                         9.74%

Worst                                                       4th Quarter 2008                                                         -8.86%

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Average Annual Total Returns - Columbia Income Builder Fund	Share Class Inception Date	1 Year	5 Years	10 Years
Class A	Feb. 16, 2006	2.38%	4.21%	4.99%
Class A | returns after taxes on distributions	Feb. 16, 2006	0.93%	2.75%	3.59%
Class A | returns after taxes on distributions and sale of Fund shares	Feb. 16, 2006	1.42%	2.69%	3.36%
Class Adv	Nov. 08, 2012	7.84%	5.50%	5.65%
Class C	Feb. 16, 2006	5.77%	4.46%	4.72%
Class Inst	Sep. 27, 2010	7.86%	5.51%	5.71%
Class Inst2	Nov. 08, 2012	7.86%	5.57%	5.68%
Class Inst3	Mar. 01, 2017	7.87%	5.31%	5.54%
Class R	Sep. 27, 2010	7.29%	4.98%	5.31%
Class T	Jun. 25, 2014	4.76%	4.69%	5.23%
Blended Benchmark (consisting of 65% Bloomberg Barclays U.S. Aggregate Bond Index, 25% Russell 3000 Value Index and 10% FTSE Three-Month U.S. Treasury Bill Index) (reflects no deductions for fees, expenses or taxes)		5.64%	4.87%	4.69%
Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)		3.54%	2.10%	4.01%
Russell 3000 Value Index (reflects no deductions for fees, expenses or taxes)		13.19%	13.95%	7.19%
FTSE Three-Month U.S. Treasury Bill Index (reflects no deductions for fees, expenses or taxes)		0.84%	0.24%	0.34%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

[1] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[2] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[1] Year to Date return as of March 31, 2018: -0.88%

XML

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

Columbia Funds Series Trust II

Prospectus Date

rr_ProspectusDate

Jun. 01, 2018

Columbia Income Builder Fund

Risk/Return:

rr_RiskReturnAbstract

Risk/Return [Heading]

rr_RiskReturnHeading

SUMMARY OF THE FUND

Objective [Heading]

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Investment Objective

Objective, Primary [Text Block]

rr_ObjectivePrimaryTextBlock

Columbia Income Builder Fund (the Fund) seeks to provide shareholders with a high level of current income and growth of capital.

Expense [Heading]

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Fees and Expenses of the Fund

Expense Narrative [Text Block]

rr_ExpenseNarrativeTextBlock

This table describes the fees and expenses that you may pay if you buy and hold shares of the Fund. The front-end sales charge applicable to Class T shares is a per-transaction charge, meaning that separate orders will not be aggregated for purposes of calculating the rate of the sales charge payable. An investor transacting in a class of Fund shares without any front-end sales charge, contingent deferred sales charge, or other asset-based fee for sales or distribution may be required to pay a commission to the financial intermediary for effecting such transactions. Such commission rates are set by the financial intermediary and are not reflected in the tables or the example below. You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 26 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Shareholder Fees Caption [Text]

rr_ShareholderFeesCaption

Shareholder Fees (fees paid directly from your investment)

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)

Portfolio Turnover [Heading]

rr_PortfolioTurnoverHeading

Portfolio Turnover

Portfolio Turnover [Text Block]

rr_PortfolioTurnoverTextBlock

The Fund and underlying funds pay transaction costs, such as commissions, when they buy and sell securities (or “turn over” their portfolios). The Fund will indirectly bear the expenses associated with portfolio turnover of the underlying funds. A high portfolio turnover rate may indicate higher transaction costs. These costs, which are not reflected in 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 13% of the average value of its portfolio.

Portfolio Turnover, Rate

rr_PortfolioTurnoverRate

13.00%

Expense Breakpoint Discounts [Text]

rr_ExpenseBreakpointDiscounts

You may qualify for sales charge discounts if you and members of your immediate family invest, or agree to invest in the future, at least $50,000 in certain classes of shares of eligible funds distributed by Columbia Management Investment Distributors, Inc. (the Distributor). More information is available about these and other sales charge discounts and waivers from your financial intermediary, and can be found in the Choosing a Share Class section beginning on page 26 of the Fund’s prospectus, in Appendix A to the prospectus beginning on page A-1 and in Appendix S to the Statement of Additional Information (SAI) under Sales Charge Waivers beginning on page S-1.

Expense Breakpoint, Minimum Investment Required [Amount]

rr_ExpenseBreakpointMinimumInvestmentRequiredAmount

$ 50,000

Expenses Restated to Reflect Current [Text]

rr_ExpensesRestatedToReflectCurrent

Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

Expenses Not Correlated to Ratio Due to Acquired Fund Fees [Text]

rr_ExpensesNotCorrelatedToRatioDueToAcquiredFundFees

“Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

Expense Example [Heading]

rr_ExpenseExampleHeading

Example

Expense Example Narrative [Text Block]

rr_ExpenseExampleNarrativeTextBlock

The following example is intended to help you compare the cost of investing in the Fund with the cost of investing in other mutual funds. The example illustrates the hypothetical expenses that you would incur over the time periods indicated, and assumes that:

• you invest $10,000 in the applicable class of Fund shares for the periods indicated,

• your investment has a 5% return each year, and

• the Fund’s total annual operating expenses remain the same as shown in the Annual Fund Operating Expenses table above.

Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

Strategy [Heading]

rr_StrategyHeading

Principal Investment Strategies

Strategy Narrative [Text Block]

rr_StrategyNarrativeTextBlock

The Fund is a “fund-of-funds” and seeks to achieve its objective by investing in a combination of underlying funds, including mutual funds and exchange-traded funds (ETFs), representing different asset classes, potentially including an allocation to alternative investment strategies. Under normal market conditions, the Fund intends to invest in each asset class within the following target asset allocation ranges:

Table 1 — Asset Class (Target Allocation Range – Under Normal Market Conditions)*
Equity	0–35%
Fixed Income	55–100%
Cash	0–15%
Alternative Investment Strategy	0–20%

* Market appreciation or depreciation may cause the Fund to be temporarily outside the ranges identified in the table. The Investment Manager may modify the target allocation ranges only upon approval of the Fund’s Board of Trustees.

Columbia Management Investment Advisers, LLC (the Investment Manager), allocates the Fund’s assets within and across different asset classes through investments in underlying funds, potentially including an allocation to alternative investment strategy funds, in an effort to achieve the Fund’s investment objective of providing a high level of current income and growth of capital. Typically, asset allocation changes will be made monthly to refine the Fund’s positioning, but may be made more or less frequently depending upon then-current allocations.

In pursuit of the Fund’s investment objective, the Investment Manager chooses investments by:

• Evaluating the Fund’s total exposure to sectors, industries, issuers and securities relative to the Fund’s indices;

• Analyzing factors such as credit quality, interest rate outlook and price; and

• Targeting certain underlying funds that invest in lower-quality (junk) bonds and foreign investments as attractive opportunities arise.

The Investment Manager relies on various qualitative and quantitative inputs to tactically allocate the Fund’s assets across the different asset classes and investment categories.

Investment Category Allocation. Within the equity and fixed income asset classes, the Investment Manager establishes allocations for the Fund, seeking to achieve the Fund’s investment objective by investing in defined investment categories. Fixed income investment categories include underlying funds that invest in: treasury inflation protected securities, mortgage- and asset-backed securities, core plus (primarily domestic investment grade bonds), high yield bonds, high yield loans, international bonds and emerging market bonds. The Investment Manager also may allocate assets to money market (cash) or alternative investment strategies. Equity investment categories include underlying funds that invest in: U.S. large cap, mid cap and small cap equities (including growth, value and core/blend styles), international equities (including emerging market securities) and real estate securities. The target allocation range constraints set forth in Table 1 are intended to promote diversification within asset classes, and the Investment Manager takes into account factors such as style, sector, market capitalization, geographic location, credit quality, interest rate outlook, and yield potential. Proposed allocation shifts are reviewed and approved by the Investment Manager as part of its qualitative review.

Risk [Heading]

rr_RiskHeading

Principal Risks

Risk Narrative [Text Block]

rr_RiskNarrativeTextBlock

An investment in the Fund involves risks, including specific risks relating to the investment in the Fund based on its investment process and its "fund-of-funds" structure, as well as specific risks related to the underlying funds in which it invests that in the aggregate are principal risks to the Fund, including among others, those described below. More information about underlying funds, including their principal risks, is available in their prospectuses, which are incorporated by reference into this prospectus. This prospectus is not an offer for any of the underlying funds. There is no assurance that the Fund will achieve its investment objective and you may lose money. The value of the Fund’s holdings may decline, and the Fund’s net asset value (NAV) and share price may go down. An investment in the Fund is not a bank deposit and is not insured or guaranteed by the Federal Deposit Insurance Corporation or any other government agency.

Allocation Risk. Because the Fund uses an asset allocation strategy in pursuit of its investment objective, there is a risk that the Fund's allocation among asset classes, investments, managers, strategies and/or investment styles will cause the Fund's shares to lose value or cause the Fund to underperform other funds with similar investment objectives and/or strategies, or that the investments themselves will not produce the returns expected.

Alternative Strategies Investment Risk. An investment in alternative investment strategies (Alternative Strategies), whether through direct investment or through one or more underlying funds that use Alternative Strategies, involves risks, which may be significant. Alternative Strategies may include strategies, instruments or other assets, such as derivatives, that seek investment returns uncorrelated with the broad equity and fixed income/debt markets, as well as those providing exposure to other markets (such as commodity markets), including but not limited to absolute (positive) return strategies. Alternative Strategies may fail to achieve their desired performance, market or other exposure, or their returns (or lack thereof) may be more correlated with the broad equity and/or fixed income/debt markets than was anticipated, and the Fund may lose money. Some Alternative Strategies may be considered speculative.

Changing Distribution Level Risk. The Fund will normally receive income which may include interest, dividends and/or capital gains, depending upon its investments. The amount of the distributions the Fund pays will vary and generally depends on the amount of income the Fund earns (less expenses) on its portfolio holdings, and capital gains or losses it recognizes. A decline in the Fund’s income or net capital gains from its investments may reduce its distribution level.

Credit Risk. Credit risk is the risk that the value of debt instruments may decline if the issuer thereof defaults or otherwise becomes unable or unwilling, or is perceived to be unable or unwilling, to honor its financial obligations, such as making payments to the Fund when due. Rating agencies assign credit ratings to certain debt instruments to indicate their credit risk. Unless otherwise provided in the Fund’s Principal Investment Strategies, investment grade debt instruments are those rated at or above BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. Conversely, below investment grade (commonly called “high-yield” or “junk”) debt instruments are those rated below BBB- by Standard and Poor’s Ratings Services, or equivalently rated by Moody’s Investors Service, Inc. or Fitch, Inc., or, if unrated, determined by the management team to be of comparable quality. A rating downgrade by such agencies can negatively impact the value of such instruments. Lower quality or unrated instruments held by the Fund may present increased credit risk as compared to higher-rated instruments. Non-investment grade debt instruments may be subject to greater price fluctuations and are more likely to experience a default than investment grade debt instruments and therefore may expose the Fund to increased credit risk. If the Fund purchases unrated instruments, or if the ratings of instruments held by the Fund are lowered after purchase, the Fund will depend on analysis of credit risk more heavily than usual.

Emerging Market Securities Risk. Securities issued by foreign governments or companies in emerging market countries, such as China, Russia and certain countries in Eastern Europe, the Middle East, Asia, Latin America or Africa, are more likely to have greater exposure to the risks of investing in foreign securities that are described in Foreign Securities Risk. In addition, emerging market countries are more likely to experience instability resulting, for example, from rapid changes or developments in social, political, economic or other conditions. Their economies are usually less mature and their securities markets are typically less developed with more limited trading activity (i.e., lower trading volumes and less liquidity) than more developed countries. Emerging market securities tend to be more volatile than securities in more developed markets. Many emerging market countries are heavily dependent on international trade and have fewer trading partners, which makes them more sensitive to world commodity prices and economic downturns in other countries, and some have a higher risk of currency devaluations.

Exchange-Traded Fund (ETF) Risk. Investments in ETFs have unique characteristics, including, but not limited to, the expense structure and additional expenses associated with investing in ETFs. ETFs are subject to, among other risks, tracking risk and passive and, in some cases, active investment risk. In addition, shareholders bear both their proportionate share of the Fund’s expenses, and indirectly the ETF’s expenses, incurred through the Fund’s ownership of the ETF. Because the expenses and costs of an underlying ETF are shared by its investors, redemptions by other investors in the ETF could result in decreased economies of scale and increased operating expenses for such ETF. The ETFs may not achieve their investment objective. The Fund, through its investment in ETFs, may not achieve its investment objective.

Foreign Securities Risk. Investments in or exposure to foreign securities involve certain risks not associated with investments in or exposure to securities of U.S. companies. Foreign securities subject the Fund to the risks associated with investing in the particular country of an issuer, including political, regulatory, economic, social, diplomatic and other conditions or events (including, for example, military confrontations, war and terrorism), occurring in the country or region, as well as risks associated with less developed custody and settlement practices. Foreign securities may be more volatile and less liquid than securities of U.S. companies, and are subject to the risks associated with potential imposition of economic and other sanctions against a particular foreign country, its nationals or industries or businesses within the country. In addition, foreign governments may impose withholding or other taxes on the Fund’s income, capital gains or proceeds from the disposition of foreign securities, which could reduce the Fund’s return on such securities. The performance of the Fund may also be negatively affected by fluctuations in a foreign currency's strength or weakness relative to the U.S. dollar, particularly to the extent the Fund invests a significant percentage of its assets in foreign securities or other assets denominated in currencies other than the U.S. dollar.

Fund-of-Funds Risk. Determinations regarding asset classes or underlying funds and the Fund’s allocations thereto may not successfully achieve the Fund’s investment objective, in whole or in part. The ability of the Fund to realize its investment objective will depend, in large part, on the extent to which the underlying funds realize their investment objective. There is no guarantee that the underlying funds will achieve their respective investment objectives. The Fund is exposed to the same risks as the underlying funds in direct proportion to the allocation of its assets among the underlying funds. Therefore, to the extent that the Fund invests significantly in a particular underlying fund, the Fund’s performance would be significantly impacted by the performance of such underlying fund. Generally, by investing in a combination of underlying funds, the Fund has exposure to the risks of many areas of the market. By concentrating its investments in relatively few underlying funds, the Fund may have more concentrated market exposures, subjecting the Fund to greater risk of loss should those markets decline or fail to rise. The performance of underlying funds could be adversely affected if other entities that invest in the same underlying funds make relatively large investments or redemptions in such underlying funds. The Fund, and its shareholders, indirectly bear a portion of the expenses of any funds in which the Fund invests. Because the expenses and costs of each underlying fund are shared by its investors, redemptions by other investors in an underlying fund could result in decreased economies of scale and increased operating expenses for such fund. The Investment Manager may have conflicts of interest in selecting affiliated funds (from which it receives management fees) over unaffiliated funds (from which it does not receive management fees) for investment by the Fund, and may also face conflicts of interest in selecting affiliated funds, because the fees the Investment Manager receives from some underlying funds may be higher than the fees paid by other underlying funds. Also, to the extent that the Fund is constrained/restricted from investing (or investing further) in a particular underlying fund for one or more reasons (e.g., underlying fund capacity constraints or regulatory restrictions) or if the Fund chooses to sell its investment in an underlying fund because of poor investment performance or for other reasons, the Fund may have to invest in another underlying fund(s), including less desirable funds – from a strategy or investment performance standpoint – which could have a negative impact on Fund performance. In addition, Fund performance could be negatively impacted if an appropriate alternate underlying fund(s) does not present itself in a timely manner or at all.

High-Yield Investments Risk. Securities and other debt instruments held by the Fund that are rated below investment grade (commonly called “high-yield” or “junk” bonds) and unrated debt instruments of comparable quality expose the Fund to a greater risk of loss of principal and income than a fund that invests solely or primarily in investment grade debt instruments. In addition, these investments have greater price fluctuations, are less liquid and are more likely to experience a default than higher-rated debt instruments. High-yield debt instruments are considered to be predominantly speculative with respect to the issuer’s capacity to pay interest and repay principal.

Interest Rate Risk. Interest rate risk is the risk of losses attributable to changes in interest rates. In general, if prevailing interest rates rise, the values of debt instruments tend to fall, and if interest rates fall, the values of debt instruments tend to rise. Changes in the value of a debt instrument usually will not affect the amount of income the Fund receives from it but will generally affect the value of your investment in the Fund. Changes in interest rates may also affect the liquidity of the Fund’s investments in debt instruments. In general, the longer the maturity or duration of a debt instrument, the greater its sensitivity to changes in interest rates. Interest rate declines also may increase prepayments of debt obligations, which, in turn, would increase prepayment risk. Similarly, a period of rising interest rates may negatively impact the Fund’s performance. Actions by governments and central banking authorities can result in increases in interest rates. Such actions may negatively affect the value of debt instruments held by the Fund, resulting in a negative impact on the Fund's performance and NAV. Debt instruments with floating coupon rates are typically less sensitive to interest rate changes, but these debt instruments may decline in value if their coupon rates do not rise as much as, or keep pace with, yields on such types of debt instruments. Because rates on certain floating rate loans and other debt instruments reset only periodically, changes in prevailing interest rates (and particularly sudden and significant changes) can be expected to cause fluctuations in the Fund’s NAV. Any interest rate increases could cause the value of the Fund’s investments in debt instruments to decrease. Rising interest rates may prompt redemptions from the Fund, which may force the Fund to sell investments at a time when it is not advantageous to do so, which could result in losses.

Issuer Risk. An issuer in which the Fund invests or to which it has exposure may perform poorly, and the value of its securities may therefore decline, which would negatively affect the Fund’s performance. Poor performance may be caused by poor management decisions, competitive pressures, breakthroughs in technology, reliance on suppliers, labor problems or shortages, corporate restructurings, fraudulent disclosures, natural disasters or other events, conditions or factors. The market capitalization of an issuer may also impact its risk profile. Investments in larger, more established companies may involve certain risks associated with their larger size. For instance, larger, more established companies may be less able to respond quickly to new competitive challenges, such as changes in consumer tastes or innovation from smaller competitors. Also, larger companies are sometimes less able to attain the high growth rates of successful smaller companies, especially during extended periods of economic expansion.

Market Risk. Market risk refers to the possibility that the market values of securities or other investments that the Fund holds will fall, sometimes rapidly or unpredictably, or fail to rise. An investment in the Fund could lose money over short or long periods.

Money Market Fund Investment Risk. An investment in a money market fund is not a bank deposit and is not insured or guaranteed by any bank, the FDIC or any other government agency. Certain money market funds float their NAV while others seek to preserve the value of investments at a stable NAV (typically, $1.00 per share). An investment in a money market fund, even an investment in a fund seeking to maintain a stable NAV per share, is not guaranteed and it is possible for the Fund to lose money by investing in these and other types of money market funds. If the liquidity of a money market fund’s portfolio deteriorates below certain levels, the money market fund may suspend redemptions (i.e., impose a redemption gate) and thereby prevent the Fund from selling its investment in the money market fund or impose a fee of up to 2% on amounts the Fund redeems from the money market fund (i.e., impose a liquidity fee). These measures may result in an investment loss or prohibit the Fund from redeeming shares when the Investment Manager would otherwise redeem shares. In addition to the fees and expenses that the Fund directly bears, the Fund indirectly bears the fees and expenses of any money market funds in which it invests, including affiliated money market funds. By investing in a money market fund, the Fund will be exposed to the investment risks of the money market fund in direct proportion to such investment. To the extent the Fund invests in instruments such as derivatives, the Fund may hold investments, which may be significant, in money market fund shares to cover its obligations resulting from the Fund’s investments in derivatives. Money market funds and the securities they invest in are subject to comprehensive regulations. The enactment of new legislation or regulations, as well as changes in interpretation and enforcement of current laws, may affect the manner of operation, performance and/or yield of money market funds.

Prepayment and Extension Risk. Prepayment and extension risk is the risk that a bond or other security or investment might, in the case of prepayment risk, be called or otherwise converted, prepaid or redeemed before maturity and, in the case of extension risk, that the investment might not be called as expected. In the case of prepayment risk, if the investment is converted, prepaid or redeemed before maturity, the portfolio managers may not be able to invest the proceeds in other investments providing as high a level of income, resulting in a reduced yield to the Fund. In the case of mortgage- or asset-backed securities, as interest rates decrease or spreads narrow, the likelihood of prepayment increases. Conversely, extension risk is the risk that an unexpected rise in interest rates will extend the life of a mortgage- or asset-backed security beyond the prepayment time. If the Fund’s investments are locked in at a lower interest rate for a longer period of time, the portfolio managers may be unable to capitalize on securities with higher interest rates or wider spreads.

Reinvestment Risk. Reinvestment risk is the risk that the Fund will not be able to reinvest income or principal at the same return it is currently earning.

Risk Lose Money [Text]

rr_RiskLoseMoney

There is no assurance that the Fund will achieve its investment objective and you may lose money.

Risk Not Insured Depository Institution [Text]

rr_RiskNotInsuredDepositoryInstitution

An investment in the Fund is not a bank deposit 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 show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategies, as well as three other measures of performance for markets in which the Fund may invest.

The performance of one or more share classes shown in the table below begins before the indicated inception date for such share class. The returns shown for each such share class include the returns of the Fund’s Class A shares (without applicable sales charges and adjusted to reflect the higher class-related operating expenses of such classes, where applicable) for periods prior to its inception date. Except for differences in annual returns resulting from differences in expenses and sales charges (where applicable), the share classes of the Fund would have substantially similar annual returns because all share classes of the Fund invest in the same portfolio of securities.

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes. Your actual after-tax returns will depend on your personal tax situation and may differ from those shown in the table. In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs). The after-tax returns are shown only for Class A shares and will vary for other share classes.

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future. Updated performance information can be obtained by calling toll-free 800.345.6611 or visiting columbiathreadneedleus.com.

Performance Information Illustrates Variability of Returns [Text]

rr_PerformanceInformationIllustratesVariabilityOfReturns

The following bar chart and table show you how the Fund has performed in the past, and can help you understand the risks of investing in the Fund. The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower. The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategies, as well as three other measures of performance for markets in which the Fund may invest.

Performance Availability Phone [Text]

rr_PerformanceAvailabilityPhone

800.345.6611

Performance Availability Website Address [Text]

rr_PerformanceAvailabilityWebSiteAddress

columbiathreadneedleus.com

Performance Past Does Not Indicate Future [Text]

rr_PerformancePastDoesNotIndicateFuture

The Fund’s past performance (before and after taxes) is no guarantee of how the Fund will perform in the future.

Bar Chart [Heading]

rr_BarChartHeading

Year by Year Total Return (%)
as of December 31 Each Year

Bar Chart Does Not Reflect Sales Loads [Text]

rr_BarChartDoesNotReflectSalesLoads

The bar chart shows how the Fund’s Class A share performance (without sales charges) has varied for each full calendar year shown. If the sales charges were reflected, returns shown would be lower.

Bar Chart Closing [Text Block]

rr_BarChartClosingTextBlock

Best and Worst Quarterly Returns
During the Period Shown in the Bar Chart

Best                                                          3rd Quarter 2009                                                         9.74%

Worst                                                       4th Quarter 2008                                                         -8.86%

Performance Table Heading

rr_PerformanceTableHeading

Average Annual Total Returns After Applicable Sales Charges (for periods ended December 31, 2017)

Performance Table Does Reflect Sales Loads

rr_PerformanceTableDoesReflectSalesLoads

The table below the bar chart compares the Fund’s returns (after applicable sales charges shown in the Shareholder Fees table in this prospectus) for the periods shown with a blended benchmark that is intended to provide a measure of the Fund's performance given its investment strategies, as well as three other measures of performance for markets in which the Fund may invest.

Performance Table Uses Highest Federal Rate

rr_PerformanceTableUsesHighestFederalRate

The after-tax returns shown in the Average Annual Total Returns table below are calculated using the highest historical individual U.S. federal marginal income tax rates in effect during the period indicated in the table and do not reflect the impact of state, local or foreign taxes.

Performance Table Not Relevant to Tax Deferred

rr_PerformanceTableNotRelevantToTaxDeferred

In addition, the after-tax returns shown in the table do not apply to shares held in tax-advantaged accounts such as 401(k) plans or Individual Retirement Accounts (IRAs).

Performance Table One Class of after Tax Shown [Text]

rr_PerformanceTableOneClassOfAfterTaxShown

The after-tax returns are shown only for Class A shares and will vary for other share classes.

Columbia Income Builder Fund | Class A

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

4.75%

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[1]

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.00%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 572

3 years

rr_ExpenseExampleYear03

778

5 years

rr_ExpenseExampleYear05

1,001

10 years

rr_ExpenseExampleYear10

1,641

1 year

rr_ExpenseExampleNoRedemptionYear01

572

3 years

rr_ExpenseExampleNoRedemptionYear03

778

5 years

rr_ExpenseExampleNoRedemptionYear05

1,001

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,641

2008

rr_AnnualReturn2008

(14.88%)

^[4]

2009

rr_AnnualReturn2009

20.24%

^[4]

2010

rr_AnnualReturn2010

11.10%

^[4]

2011

rr_AnnualReturn2011

4.76%

^[4]

2012

rr_AnnualReturn2012

11.18%

^[4]

2013

rr_AnnualReturn2013

6.20%

^[4]

2014

rr_AnnualReturn2014

4.81%

^[4]

2015

rr_AnnualReturn2015

(1.55%)

^[4]

2016

rr_AnnualReturn2016

9.54%

^[4]

2017

rr_AnnualReturn2017

7.51%

^[4]

Year to Date Return, Label

rr_YearToDateReturnLabel

Year to Date return

Bar Chart, Year to Date Return, Date

rr_BarChartYearToDateReturnDate

Mar. 31, 2018

Bar Chart, Year to Date Return

rr_BarChartYearToDateReturn

(0.88%)

Highest Quarterly Return, Label

rr_HighestQuarterlyReturnLabel

Best

Highest Quarterly Return, Date

rr_BarChartHighestQuarterlyReturnDate

Sep. 30, 2009

Highest Quarterly Return

rr_BarChartHighestQuarterlyReturn

9.74%

Lowest Quarterly Return, Label

rr_LowestQuarterlyReturnLabel

Worst

Lowest Quarterly Return, Date

rr_BarChartLowestQuarterlyReturnDate

Dec. 31, 2008

Lowest Quarterly Return

rr_BarChartLowestQuarterlyReturn

(8.86%)

1 Year

rr_AverageAnnualReturnYear01

2.38%

5 Years

rr_AverageAnnualReturnYear05

4.21%

10 Years

rr_AverageAnnualReturnYear10

4.99%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 16, 2006

Columbia Income Builder Fund | Class Adv

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.75%

^[3]

1 year

rr_ExpenseExampleYear01

$ 77

3 years

rr_ExpenseExampleYear03

240

5 years

rr_ExpenseExampleYear05

417

10 years

rr_ExpenseExampleYear10

930

1 year

rr_ExpenseExampleNoRedemptionYear01

77

3 years

rr_ExpenseExampleNoRedemptionYear03

240

5 years

rr_ExpenseExampleNoRedemptionYear05

417

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 930

1 Year

rr_AverageAnnualReturnYear01

7.84%

5 Years

rr_AverageAnnualReturnYear05

5.50%

10 Years

rr_AverageAnnualReturnYear10

5.65%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 08, 2012

Columbia Income Builder Fund | Class C

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

1.00%

^[5]

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

1.00%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.75%

^[3]

Expenses Deferred Charges [Text Block]

rr_ExpensesDeferredChargesTextBlock

This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

1 year

rr_ExpenseExampleYear01

$ 278

3 years

rr_ExpenseExampleYear03

551

5 years

rr_ExpenseExampleYear05

949

10 years

rr_ExpenseExampleYear10

2,062

1 year

rr_ExpenseExampleNoRedemptionYear01

178

3 years

rr_ExpenseExampleNoRedemptionYear03

551

5 years

rr_ExpenseExampleNoRedemptionYear05

949

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 2,062

1 Year

rr_AverageAnnualReturnYear01

5.77%

5 Years

rr_AverageAnnualReturnYear05

4.46%

10 Years

rr_AverageAnnualReturnYear10

4.72%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 16, 2006

Columbia Income Builder Fund | Class Inst

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.75%

^[3]

1 year

rr_ExpenseExampleYear01

$ 77

3 years

rr_ExpenseExampleYear03

240

5 years

rr_ExpenseExampleYear05

417

10 years

rr_ExpenseExampleYear10

930

1 year

rr_ExpenseExampleNoRedemptionYear01

77

3 years

rr_ExpenseExampleNoRedemptionYear03

240

5 years

rr_ExpenseExampleNoRedemptionYear05

417

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 930

1 Year

rr_AverageAnnualReturnYear01

7.86%

5 Years

rr_AverageAnnualReturnYear05

5.51%

10 Years

rr_AverageAnnualReturnYear10

5.71%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Income Builder Fund | Class Inst2

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.10%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.74%

^[3]

1 year

rr_ExpenseExampleYear01

$ 76

3 years

rr_ExpenseExampleYear03

237

5 years

rr_ExpenseExampleYear05

411

10 years

rr_ExpenseExampleYear10

918

1 year

rr_ExpenseExampleNoRedemptionYear01

76

3 years

rr_ExpenseExampleNoRedemptionYear03

237

5 years

rr_ExpenseExampleNoRedemptionYear05

411

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 918

1 Year

rr_AverageAnnualReturnYear01

7.86%

5 Years

rr_AverageAnnualReturnYear05

5.57%

10 Years

rr_AverageAnnualReturnYear10

5.68%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Nov. 08, 2012

Columbia Income Builder Fund | Class Inst3

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

none

Other expenses

rr_OtherExpensesOverAssets

0.04%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

0.68%

^[3]

1 year

rr_ExpenseExampleYear01

$ 69

3 years

rr_ExpenseExampleYear03

218

5 years

rr_ExpenseExampleYear05

379

10 years

rr_ExpenseExampleYear10

847

1 year

rr_ExpenseExampleNoRedemptionYear01

69

3 years

rr_ExpenseExampleNoRedemptionYear03

218

5 years

rr_ExpenseExampleNoRedemptionYear05

379

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 847

1 Year

rr_AverageAnnualReturnYear01

7.87%

5 Years

rr_AverageAnnualReturnYear05

5.31%

10 Years

rr_AverageAnnualReturnYear10

5.54%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Mar. 01, 2017

Columbia Income Builder Fund | Class R

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

none

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.50%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.25%

^[3]

1 year

rr_ExpenseExampleYear01

$ 127

3 years

rr_ExpenseExampleYear03

397

5 years

rr_ExpenseExampleYear05

686

10 years

rr_ExpenseExampleYear10

1,511

1 year

rr_ExpenseExampleNoRedemptionYear01

127

3 years

rr_ExpenseExampleNoRedemptionYear03

397

5 years

rr_ExpenseExampleNoRedemptionYear05

686

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,511

1 Year

rr_AverageAnnualReturnYear01

7.29%

5 Years

rr_AverageAnnualReturnYear05

4.98%

10 Years

rr_AverageAnnualReturnYear10

5.31%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Sep. 27, 2010

Columbia Income Builder Fund | Class T

Risk/Return:

rr_RiskReturnAbstract

Maximum sales charge (load) imposed on purchases (as a % of offering price)

rr_MaximumSalesChargeImposedOnPurchasesOverOfferingPrice

2.50%

Maximum deferred sales charge (load) imposed on redemptions (as a % of the lower of the original purchase price or current net asset value)

rr_MaximumDeferredSalesChargeOverOther

none

Management fees

rr_ManagementFeesOverAssets

0.02%

Distribution and/or service (12b-1) fees

rr_DistributionAndService12b1FeesOverAssets

0.25%

Other expenses

rr_OtherExpensesOverAssets

0.11%

^[2]

Acquired fund fees and expenses

rr_AcquiredFundFeesAndExpensesOverAssets

0.62%

Total annual Fund operating expenses

rr_ExpensesOverAssets

1.00%

^[3]

1 year

rr_ExpenseExampleYear01

$ 349

3 years

rr_ExpenseExampleYear03

560

5 years

rr_ExpenseExampleYear05

789

10 years

rr_ExpenseExampleYear10

1,444

1 year

rr_ExpenseExampleNoRedemptionYear01

349

3 years

rr_ExpenseExampleNoRedemptionYear03

560

5 years

rr_ExpenseExampleNoRedemptionYear05

789

10 years

rr_ExpenseExampleNoRedemptionYear10

$ 1,444

1 Year

rr_AverageAnnualReturnYear01

4.76%

5 Years

rr_AverageAnnualReturnYear05

4.69%

10 Years

rr_AverageAnnualReturnYear10

5.23%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Jun. 25, 2014

Columbia Income Builder Fund | returns after taxes on distributions | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.93%

5 Years

rr_AverageAnnualReturnYear05

2.75%

10 Years

rr_AverageAnnualReturnYear10

3.59%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 16, 2006

Columbia Income Builder Fund | returns after taxes on distributions and sale of Fund shares | Class A

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

1.42%

5 Years

rr_AverageAnnualReturnYear05

2.69%

10 Years

rr_AverageAnnualReturnYear10

3.36%

Share Class Inception Date

rr_AverageAnnualReturnInceptionDate

Feb. 16, 2006

Columbia Income Builder Fund | Blended Benchmark (consisting of 65% Bloomberg Barclays U.S. Aggregate Bond Index, 25% Russell 3000 Value Index and 10% FTSE Three-Month U.S. Treasury Bill Index) (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

5.64%

5 Years

rr_AverageAnnualReturnYear05

4.87%

10 Years

rr_AverageAnnualReturnYear10

4.69%

Columbia Income Builder Fund | Bloomberg Barclays U.S. Aggregate Bond Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

3.54%

5 Years

rr_AverageAnnualReturnYear05

2.10%

10 Years

rr_AverageAnnualReturnYear10

4.01%

Columbia Income Builder Fund | Russell 3000 Value Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

13.19%

5 Years

rr_AverageAnnualReturnYear05

13.95%

10 Years

rr_AverageAnnualReturnYear10

7.19%

Columbia Income Builder Fund | FTSE Three-Month U.S. Treasury Bill Index (reflects no deductions for fees, expenses or taxes)

Risk/Return:

rr_RiskReturnAbstract

1 Year

rr_AverageAnnualReturnYear01

0.84%

5 Years

rr_AverageAnnualReturnYear05

0.24%

10 Years

rr_AverageAnnualReturnYear10

0.34%

[1] This charge is imposed on certain investments of between $1 million and $50 million redeemed within 18 months after purchase, as follows: 1.00% if redeemed within 12 months after purchase, and 0.50% if redeemed more than 12, but less than 18, months after purchase, with certain limited exceptions.

[2] Other expenses have been restated to reflect current transfer agency fees paid by the Fund.

[3] “Total annual Fund operating expenses” include acquired fund fees and expenses (expenses the Fund incurs indirectly through its investments in other investment companies) and may be higher than “Total Net Expenses” shown in the Financial Highlights section of this prospectus because “Total Net Expenses” do not include acquired fund fees and expenses.

[4] Year to Date return as of March 31, 2018: -0.88%

[5] This charge applies to redemptions within 12 months after purchase, with certain limited exceptions.

XML

Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Registrant Name	dei_EntityRegistrantName	Columbia Funds Series Trust II
Prospectus Date	rr_ProspectusDate	Jun. 01, 2018
Document Creation Date	dei_DocumentCreationDate	May 25, 2018