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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName COLUMBIA ACORN TRUST
Prospectus Date rr_ProspectusDate May 01, 2019
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

COLUMBIA ACORN TRUST

Supplement dated July 1, 2019

to the Prospectus, Summary Prospectus and Statement of Additional Information (“SAI”) dated May 1, 2019

for following Fund (“Fund”):

 

Columbia Acorn International Select

Effective immediately, the Fund’s Prospectus and Summary Prospectus are supplemented as follows:

 

1.
The Annual Fund Operating Expenses table that appears under the section heading “Fees and Expenses of the Fund” is removed and replaced with the following:

 

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
    
Class
A
  
Class
Adv
  
Class
C
  
Class
Inst
  
Class
Inst2
  
Class
Inst3
Management fees
    0.89%   0.89%   0.89%   0.89%   0.89%   0.89%
Distribution and/or service (12b-1)
fees		    0.25%   0.00%   1.00%   0.00%   0.00%   0.00%
Other expenses(c)
    0.39%   0.39%   0.39%   0.39%   0.31%   0.26%
Total annual Fund operating
expenses(d)		    1.53%   1.28%   2.28%   1.28%   1.20%   1.15%
Fee waivers and/or expense
reimbursements(e)		    (0.22)%   (0.22)%   (0.22)%   (0.22)%   (0.23)%   (0.23)%
Total annual Fund operating
expenses after fee waivers and/or
expense reimbursements		    1.31%   1.06%   2.06%   1.06%   0.97%   0.92%

 

  (c) 
Other expenses have been restated to reflect current transfer agency fees paid by the Fund.
  (d) 
“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 the ratio of expenses to average net assets shown in the Financial Highlights section of this prospectus because the ratio of expenses to average net assets does not include acquired fund fees and expenses.
  (e) 
Columbia Wanger Asset Management, LLC (the Investment Manager) has contractually agreed to waive fees and reimburse certain expenses of the Fund, through June 30, 2020, so that ordinary operating expenses (excluding transaction costs and certain other investment-related expenses, interest and fees on borrowings and expenses associated with the Fund’s investment in other investment companies, if any) do not exceed the annual rates of 1.31% for Class A shares, 1.06% for Class Adv shares, 2.06% for Class C shares, 1.06% for Class Inst shares, 0.97% for Class Inst2 shares and 0.92% for Class Inst3 shares. This arrangement may only be amended or terminated with approval from the Fund’s Board of Trustees and the Investment Manager. The fee waivers and/or expense reimbursements shown in the table also reflect the contractual agreement of the Fund’s transfer agent, Columbia Management Investment Services Corp. (the Transfer Agent), to waive a portion of its fees through June 30, 2020, such that the Fund’s transfer agency fees do not exceed the annual rates of 0.05% of the average daily net assets of Class Inst2 shares and 0.00% of the average daily net assets of Class Inst3 shares.

 

2.
The Example table and the paragraph that immediately precedes it under the section heading “Fees and Expenses of the Fund” are removed and replaced with the following:

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

 

     1 year    3 years    5 years    10 years
Class A (whether or not shares are redeemed)
    $701    $1,010    $1,342    $2,276
Class Adv (whether or not shares are redeemed)
    $108    $384    $681    $1,526
Class C (assuming redemption of all shares at the
end of the period)		    $309    $691    $1,200    $2,598
Class C (assuming no redemption of shares)
    $209    $691    $1,200    $2,598
Class Inst (whether or not shares are redeemed)
    $108    $384    $681    $1,526
Class Inst2 (whether or not shares are redeemed)
    $99    $358    $638    $1,434
Class Inst3 (whether or not shares are redeemed)
    $94    $343    $611    $1,377
Columbia Acorn International Select  
Risk/Return: rr_RiskReturnAbstract  
Supplement to Prospectus [Text Block] rr_SupplementToProspectusTextBlock

COLUMBIA ACORN TRUST

Supplement dated July 1, 2019

to the Prospectus, Summary Prospectus and Statement of Additional Information (“SAI”) dated May 1, 2019

for following Fund (“Fund”):

 

Columbia Acorn International Select

Effective immediately, the Fund’s Prospectus and Summary Prospectus are supplemented as follows:

 

1.
The Annual Fund Operating Expenses table that appears under the section heading “Fees and Expenses of the Fund” is removed and replaced with the following:

 

Annual Fund Operating Expenses
(expenses that you pay each year as a percentage of the value of your investment)
    
Class
A
  
Class
Adv
  
Class
C
  
Class
Inst
  
Class
Inst2
  
Class
Inst3
Management fees
    0.89%   0.89%   0.89%   0.89%   0.89%   0.89%
Distribution and/or service (12b-1)
fees		    0.25%   0.00%   1.00%   0.00%   0.00%   0.00%
Other expenses(c)
    0.39%   0.39%   0.39%   0.39%   0.31%   0.26%
Total annual Fund operating
expenses(d)		    1.53%   1.28%   2.28%   1.28%   1.20%   1.15%
Fee waivers and/or expense
reimbursements(e)		    (0.22)%   (0.22)%   (0.22)%   (0.22)%   (0.23)%   (0.23)%
Total annual Fund operating
expenses after fee waivers and/or
expense reimbursements		    1.31%   1.06%   2.06%   1.06%   0.97%   0.92%

 

  (c) 
Other expenses have been restated to reflect current transfer agency fees paid by the Fund.
  (d) 
“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 the ratio of expenses to average net assets shown in the Financial Highlights section of this prospectus because the ratio of expenses to average net assets does not include acquired fund fees and expenses.
  (e) 
Columbia Wanger Asset Management, LLC (the Investment Manager) has contractually agreed to waive fees and reimburse certain expenses of the Fund, through June 30, 2020, so that ordinary operating expenses (excluding transaction costs and certain other investment-related expenses, interest and fees on borrowings and expenses associated with the Fund’s investment in other investment companies, if any) do not exceed the annual rates of 1.31% for Class A shares, 1.06% for Class Adv shares, 2.06% for Class C shares, 1.06% for Class Inst shares, 0.97% for Class Inst2 shares and 0.92% for Class Inst3 shares. This arrangement may only be amended or terminated with approval from the Fund’s Board of Trustees and the Investment Manager. The fee waivers and/or expense reimbursements shown in the table also reflect the contractual agreement of the Fund’s transfer agent, Columbia Management Investment Services Corp. (the Transfer Agent), to waive a portion of its fees through June 30, 2020, such that the Fund’s transfer agency fees do not exceed the annual rates of 0.05% of the average daily net assets of Class Inst2 shares and 0.00% of the average daily net assets of Class Inst3 shares.

 

2.
The Example table and the paragraph that immediately precedes it under the section heading “Fees and Expenses of the Fund” are removed and replaced with the following:

Since the waivers and/or reimbursements shown in the Annual Fund Operating Expenses table above expire as indicated in the preceding table, they are only reflected in the 1 year example and the first of the other examples. Although your actual costs may be higher or lower, based on the assumptions listed above, your costs would be:

 

     1 year    3 years    5 years    10 years
Class A (whether or not shares are redeemed)
    $701    $1,010    $1,342    $2,276
Class Adv (whether or not shares are redeemed)
    $108    $384    $681    $1,526
Class C (assuming redemption of all shares at the
end of the period)		    $309    $691    $1,200    $2,598
Class C (assuming no redemption of shares)
    $209    $691    $1,200    $2,598
Class Inst (whether or not shares are redeemed)
    $108    $384    $681    $1,526
Class Inst2 (whether or not shares are redeemed)
    $99    $358    $638    $1,434
Class Inst3 (whether or not shares are redeemed)
    $94    $343    $611    $1,377
Operating Expenses Caption [Text] rr_OperatingExpensesCaption Annual Fund Operating Expenses (expenses that you pay each year as a percentage of the value of your investment)
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination June 30, 2020
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 the ratio of expenses to average net assets shown in the Financial Highlights section of this prospectus because the ratio of expenses to average net assets does not include acquired fund fees and expenses.
Columbia Acorn International Select | Class A  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.89%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other expenses rr_OtherExpensesOverAssets 0.39% [1]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.53% [2]
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [3]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 1.31%
1 year rr_ExpenseExampleYear01 $ 701
3 years rr_ExpenseExampleYear03 1,010
5 years rr_ExpenseExampleYear05 1,342
10 years rr_ExpenseExampleYear10 2,276
1 year rr_ExpenseExampleNoRedemptionYear01 701
3 years rr_ExpenseExampleNoRedemptionYear03 1,010
5 years rr_ExpenseExampleNoRedemptionYear05 1,342
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,276
Columbia Acorn International Select | Class Adv  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.89%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.39% [1]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.28% [2]
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [3]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 1.06%
1 year rr_ExpenseExampleYear01 $ 108
3 years rr_ExpenseExampleYear03 384
5 years rr_ExpenseExampleYear05 681
10 years rr_ExpenseExampleYear10 1,526
1 year rr_ExpenseExampleNoRedemptionYear01 108
3 years rr_ExpenseExampleNoRedemptionYear03 384
5 years rr_ExpenseExampleNoRedemptionYear05 681
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,526
Columbia Acorn International Select | Class C  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.89%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other expenses rr_OtherExpensesOverAssets 0.39% [1]
Total annual Fund operating expenses rr_ExpensesOverAssets 2.28% [2]
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [3]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 2.06%
1 year rr_ExpenseExampleYear01 $ 309
3 years rr_ExpenseExampleYear03 691
5 years rr_ExpenseExampleYear05 1,200
10 years rr_ExpenseExampleYear10 2,598
1 year rr_ExpenseExampleNoRedemptionYear01 209
3 years rr_ExpenseExampleNoRedemptionYear03 691
5 years rr_ExpenseExampleNoRedemptionYear05 1,200
10 years rr_ExpenseExampleNoRedemptionYear10 $ 2,598
Columbia Acorn International Select | Class Inst  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.89%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.39% [1]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.28% [2]
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.22%) [3]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 1.06%
1 year rr_ExpenseExampleYear01 $ 108
3 years rr_ExpenseExampleYear03 384
5 years rr_ExpenseExampleYear05 681
10 years rr_ExpenseExampleYear10 1,526
1 year rr_ExpenseExampleNoRedemptionYear01 108
3 years rr_ExpenseExampleNoRedemptionYear03 384
5 years rr_ExpenseExampleNoRedemptionYear05 681
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,526
Columbia Acorn International Select | Class Inst2  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.89%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.31% [1]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.20% [2]
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%) [3]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 0.97%
1 year rr_ExpenseExampleYear01 $ 99
3 years rr_ExpenseExampleYear03 358
5 years rr_ExpenseExampleYear05 638
10 years rr_ExpenseExampleYear10 1,434
1 year rr_ExpenseExampleNoRedemptionYear01 99
3 years rr_ExpenseExampleNoRedemptionYear03 358
5 years rr_ExpenseExampleNoRedemptionYear05 638
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,434
Columbia Acorn International Select | Class Inst3  
Risk/Return: rr_RiskReturnAbstract  
Management fees rr_ManagementFeesOverAssets 0.89%
Distribution and/or service (12b-1) fees rr_DistributionAndService12b1FeesOverAssets none
Other expenses rr_OtherExpensesOverAssets 0.26% [1]
Total annual Fund operating expenses rr_ExpensesOverAssets 1.15% [2]
Fee waivers and/or expense reimbursements rr_FeeWaiverOrReimbursementOverAssets (0.23%) [3]
Total annual Fund operating expenses after fee waivers and/or expense reimbursements rr_NetExpensesOverAssets 0.92%
1 year rr_ExpenseExampleYear01 $ 94
3 years rr_ExpenseExampleYear03 343
5 years rr_ExpenseExampleYear05 611
10 years rr_ExpenseExampleYear10 1,377
1 year rr_ExpenseExampleNoRedemptionYear01 94
3 years rr_ExpenseExampleNoRedemptionYear03 343
5 years rr_ExpenseExampleNoRedemptionYear05 611
10 years rr_ExpenseExampleNoRedemptionYear10 $ 1,377
[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 the ratio of expenses to average net assets shown in the Financial Highlights section of this prospectus because the ratio of expenses to average net assets does not include acquired fund fees and expenses.
[3] Columbia Wanger Asset Management, LLC (the Investment Manager) has contractually agreed to waive fees and reimburse certain expenses of the Fund, through June 30, 2020, so that ordinary operating expenses (excluding transaction costs and certain other investment-related expenses, interest and fees on borrowings and expenses associated with the Fund’s investment in other investment companies, if any) do not exceed the annual rates of 1.31% for Class A shares, 1.06% for Class Adv shares, 2.06% for Class C shares, 1.06% for Class Inst shares, 0.97% for Class Inst2 shares and 0.92% for Class Inst3 shares. This arrangement may only be amended or terminated with approval from the Fund’s Board of Trustees and the Investment Manager. The fee waivers and/or expense reimbursements shown in the table also reflect the contractual agreement of the Fund’s transfer agent, Columbia Management Investment Services Corp. (the Transfer Agent), to waive a portion of its fees through June 30, 2020, such that the Fund’s transfer agency fees do not exceed the annual rates of 0.05% of the average daily net assets of Class Inst2 shares and 0.00% of the average daily net assets of Class Inst3 shares.