Label |
Element |
Value |
Risk/Return: |
rr_RiskReturnAbstract |
|
|
Registrant Name |
dei_EntityRegistrantName |
COLUMBIA ACORN TRUST
|
|
Prospectus Date |
rr_ProspectusDate |
May 01, 2016
|
|
Supplement [Text Block] |
cat_SupplementTextBlock |
Supplement dated June 27, 2016 to the Prospectus and Summary Prospectus of the following Fund: Fund | Prospectus and Summary Prospectus Dated | Columbia Acorn Trust | | Columbia Acorn Emerging Markets FundSM | 5/1/2016 | 1. | The table under the caption “Fees and Expenses of the Fund” in the “Summary of the Fund” section of the Prospectus and the Summary Prospectus is hereby superseded and replaced with the following: | Shareholder Fees (fees paid directly from your investment) | | Class A | Class C | Classes I, R4, R5, Y and Z | Maximum sales charge (load) imposed on purchases (as a % of offering price) | 5.75% | 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% (a) | 1.00% (b) | None | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | | Class A | Class C | Class I | Class R4 | Class R5 | Class Y | Class Z | Management fees(c) | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% | Distribution and/or service (12b-1) fees | 0.25% | 1.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | Other expenses(d) | 0.45% | 0.45% | 0.29% | 0.45% | 0.34% | 0.29% | 0.45% | Total annual Fund operating expenses | 1.80% | 2.55% | 1.39% | 1.55% | 1.44% | 1.39% | 1.55% | (a) | 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. | (b) | This charge applies to redemptions within 12 months after purchase, with certain limited exceptions. | (c) | Management fees have been restated to reflect current fees based on current asset levels. | (d) | Other expenses have been restated and are based on estimated amounts for the Fund’s current fiscal year, taking into consideration changes in the Fund’s net assets and changes in the method of allocating transfer agent expenses among Class A, Class C, Class R4 and Class Z shares of the Fund. | 2. | The expense example table that appears under the caption “Fees and Expenses of the Fund – Example” in the “Summary of the Fund” section of the Prospectus and the Summary Prospectus is hereby superseded and replaced with the following: | | 1 year | 3 years | 5 years | 10 years | Class A (whether or not shares are redeemed) | $747 | 1,109 | $1,494 | $2,569 | Class C (assuming redemption of all shares at the end of the period) | $358 | 793 | $1,355 | $2,885 | Class C (assuming no redemption of shares) | $258 | 793 | $1,355 | $2,885 | Class I (whether or not shares are redeemed) | $142 | 440 | $ 761 | $1,669 | Class R4 (whether or not shares are redeemed) | $158 | 490 | $ 845 | $1,845 | Class R5 (whether or not shares are redeemed) | $147 | 456 | $ 787 | $1,724 | Class Y (whether or not shares are redeemed) | $142 | 440 | $ 761 | $1,669 | Class Z (whether or not shares are redeemed) | $158 | 490 | $ 845 | $1,845 |
|
|
Columbia Acorn Emerging Markets Fund |
|
|
|
Risk/Return: |
rr_RiskReturnAbstract |
|
|
Supplement [Text Block] |
cat_SupplementTextBlock |
Supplement dated June 27, 2016 to the Prospectus and Summary Prospectus of the following Fund: Fund | Prospectus and Summary Prospectus Dated | Columbia Acorn Trust | | Columbia Acorn Emerging Markets FundSM | 5/1/2016 | 1. | The table under the caption “Fees and Expenses of the Fund” in the “Summary of the Fund” section of the Prospectus and the Summary Prospectus is hereby superseded and replaced with the following: | Shareholder Fees (fees paid directly from your investment) | | Class A | Class C | Classes I, R4, R5, Y and Z | Maximum sales charge (load) imposed on purchases (as a % of offering price) | 5.75% | 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% (a) | 1.00% (b) | None | Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment) | | Class A | Class C | Class I | Class R4 | Class R5 | Class Y | Class Z | Management fees(c) | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% | 1.10% | Distribution and/or service (12b-1) fees | 0.25% | 1.00% | 0.00% | 0.00% | 0.00% | 0.00% | 0.00% | Other expenses(d) | 0.45% | 0.45% | 0.29% | 0.45% | 0.34% | 0.29% | 0.45% | Total annual Fund operating expenses | 1.80% | 2.55% | 1.39% | 1.55% | 1.44% | 1.39% | 1.55% | (a) | 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. | (b) | This charge applies to redemptions within 12 months after purchase, with certain limited exceptions. | (c) | Management fees have been restated to reflect current fees based on current asset levels. | (d) | Other expenses have been restated and are based on estimated amounts for the Fund’s current fiscal year, taking into consideration changes in the Fund’s net assets and changes in the method of allocating transfer agent expenses among Class A, Class C, Class R4 and Class Z shares of the Fund. | 2. | The expense example table that appears under the caption “Fees and Expenses of the Fund – Example” in the “Summary of the Fund” section of the Prospectus and the Summary Prospectus is hereby superseded and replaced with the following: | | 1 year | 3 years | 5 years | 10 years | Class A (whether or not shares are redeemed) | $747 | 1,109 | $1,494 | $2,569 | Class C (assuming redemption of all shares at the end of the period) | $358 | 793 | $1,355 | $2,885 | Class C (assuming no redemption of shares) | $258 | 793 | $1,355 | $2,885 | Class I (whether or not shares are redeemed) | $142 | 440 | $ 761 | $1,669 | Class R4 (whether or not shares are redeemed) | $158 | 490 | $ 845 | $1,845 | Class R5 (whether or not shares are redeemed) | $147 | 456 | $ 787 | $1,724 | Class Y (whether or not shares are redeemed) | $142 | 440 | $ 761 | $1,669 | Class Z (whether or not shares are redeemed) | $158 | 490 | $ 845 | $1,845 |
|
|
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)
|
|
Expenses Restated to Reflect Current [Text] |
rr_ExpensesRestatedToReflectCurrent |
Management fees have been restated to reflect current fees based on current asset levels.
Other expenses have been restated and are based on estimated amounts for the Fund’s current fiscal year, taking into consideration changes in the Fund’s net assets and changes in the method of allocating transfer agent expenses among Class A, Class C, Class R4 and Class Z shares of the Fund.
|
|
Columbia Acorn Emerging Markets Fund | 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 |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
0.25%
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.45%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
1.80%
|
|
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 |
$ 747
|
|
3 years |
rr_ExpenseExampleYear03 |
1,109
|
|
5 years |
rr_ExpenseExampleYear05 |
1,494
|
|
10 years |
rr_ExpenseExampleYear10 |
2,569
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
747
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
1,109
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
1,494
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 2,569
|
|
Columbia Acorn Emerging Markets 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%
|
[4] |
Management fees |
rr_ManagementFeesOverAssets |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
1.00%
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.45%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
2.55%
|
|
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 |
$ 358
|
|
3 years |
rr_ExpenseExampleYear03 |
793
|
|
5 years |
rr_ExpenseExampleYear05 |
1,355
|
|
10 years |
rr_ExpenseExampleYear10 |
2,885
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
258
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
793
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
1,355
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 2,885
|
|
Columbia Acorn Emerging Markets Fund | Class I |
|
|
|
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 |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.29%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
1.39%
|
|
1 year |
rr_ExpenseExampleYear01 |
$ 142
|
|
3 years |
rr_ExpenseExampleYear03 |
440
|
|
5 years |
rr_ExpenseExampleYear05 |
761
|
|
10 years |
rr_ExpenseExampleYear10 |
1,669
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
142
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
440
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
761
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,669
|
|
Columbia Acorn Emerging Markets Fund | Class R4 |
|
|
|
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 |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.45%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
1.55%
|
|
1 year |
rr_ExpenseExampleYear01 |
$ 158
|
|
3 years |
rr_ExpenseExampleYear03 |
490
|
|
5 years |
rr_ExpenseExampleYear05 |
845
|
|
10 years |
rr_ExpenseExampleYear10 |
1,845
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
158
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
490
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
845
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,845
|
|
Columbia Acorn Emerging Markets Fund | Class R5 |
|
|
|
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 |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.34%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
1.44%
|
|
1 year |
rr_ExpenseExampleYear01 |
$ 147
|
|
3 years |
rr_ExpenseExampleYear03 |
456
|
|
5 years |
rr_ExpenseExampleYear05 |
787
|
|
10 years |
rr_ExpenseExampleYear10 |
1,724
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
147
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
456
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
787
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,724
|
|
Columbia Acorn Emerging Markets Fund | Class Y |
|
|
|
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 |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.29%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
1.39%
|
|
1 year |
rr_ExpenseExampleYear01 |
$ 142
|
|
3 years |
rr_ExpenseExampleYear03 |
440
|
|
5 years |
rr_ExpenseExampleYear05 |
761
|
|
10 years |
rr_ExpenseExampleYear10 |
1,669
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
142
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
440
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
761
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,669
|
|
Columbia Acorn Emerging Markets Fund | Class Z |
|
|
|
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 |
1.10%
|
[2] |
Distribution and/or service (12b-1) fees |
rr_DistributionAndService12b1FeesOverAssets |
none
|
|
Other expenses |
rr_OtherExpensesOverAssets |
0.45%
|
[3] |
Total annual Fund operating expenses |
rr_ExpensesOverAssets |
1.55%
|
|
1 year |
rr_ExpenseExampleYear01 |
$ 158
|
|
3 years |
rr_ExpenseExampleYear03 |
490
|
|
5 years |
rr_ExpenseExampleYear05 |
845
|
|
10 years |
rr_ExpenseExampleYear10 |
1,845
|
|
1 year |
rr_ExpenseExampleNoRedemptionYear01 |
158
|
|
3 years |
rr_ExpenseExampleNoRedemptionYear03 |
490
|
|
5 years |
rr_ExpenseExampleNoRedemptionYear05 |
845
|
|
10 years |
rr_ExpenseExampleNoRedemptionYear10 |
$ 1,845
|
|
|
|