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Label Element Value
Prospectus: rr_ProspectusTable  
Document Type dei_DocumentType 497
Document Period End Date dei_DocumentPeriodEndDate Nov. 30, 2018
Entity Registrant Name dei_EntityRegistrantName AMERICAN CENTURY INVESTMENT TRUST
Central Index Key dei_EntityCentralIndexKey 0000908406
Amendment Flag dei_AmendmentFlag false
Document Creation Date dei_DocumentCreationDate Nov. 30, 2018
Document Effective Date dei_DocumentEffectiveDate Aug. 01, 2018
Prospectus Date rr_ProspectusDate Aug. 01, 2018
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND  
Prospectus: rr_ProspectusTable  
Supplement [Text Block] ck000077367_SupplementTextBlock
American Century Investment Trust
Prospectus Supplement
Short Duration Strategic Income Fund
newaci_logoblk.jpg
Supplement dated December 1, 2018 n Prospectus dated August 1, 2018

The following replaces the Annual Fund Operating Expenses table on page 2 of the prospectus.
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)
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | INVESTOR CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.64%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.52%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 53
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 187
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 332
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 754
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | I CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.50% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.54%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.42%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 43
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 155
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 277
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 632
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | Y CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.44%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.32%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 33
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 123
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 221
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 509
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | A CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.25%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.89%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.77%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 302
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 485
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 683
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,254
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | C CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 1.00%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.64%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.52%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 155
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 500
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 868
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,902
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | R CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.60% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets 0.50%
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 1.14%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 1.02%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 104
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 344
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 604
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 1,343
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | R5 CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.40% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.44%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.32%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 33
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 123
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 221
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 509
AMERICAN CENTURY INVESTMENT TRUST | SHORT DURATION STRATEGIC INCOME FUND | R6 CLASS  
Prospectus: rr_ProspectusTable  
Management Fees (as a percentage of Assets) rr_ManagementFeesOverAssets 0.35% [1]
Distribution and Service (12b-1) Fees rr_DistributionAndService12b1FeesOverAssets none
Other Expenses (as a percentage of Assets): rr_OtherExpensesOverAssets 0.01%
Acquired Fund Fees and Expenses rr_AcquiredFundFeesAndExpensesOverAssets 0.03%
Expenses (as a percentage of Assets) rr_ExpensesOverAssets 0.39%
Fee Waiver or Reimbursement rr_FeeWaiverOrReimbursementOverAssets (0.12%) [2],[3]
Net Expenses (as a percentage of Assets) rr_NetExpensesOverAssets 0.27%
Fee Waiver or Reimbursement over Assets, Date of Termination rr_FeeWaiverOrReimbursementOverAssetsDateOfTermination November 30, 2019
Expense Example, with Redemption, 1 Year rr_ExpenseExampleYear01 $ 28
Expense Example, with Redemption, 3 Years rr_ExpenseExampleYear03 107
Expense Example, with Redemption, 5 Years rr_ExpenseExampleYear05 193
Expense Example, with Redemption, 10 Years rr_ExpenseExampleYear10 $ 447
[1] 3 The management fee has been restated to reflect the decrease in the management fee schedule effective August 1, 2018.
[2] 4 The advisor will waive the portion of the fund’s management fee equal to the expenses attributable to the management fees of the American Century funds in which the fund invests. The amount of this waiver fluctuates depending on the fund’s daily allocation to other American Century funds. This waiver is expected to remain in effect permanently and it cannot be terminated without the approval of the Board of Trustees.
[3] 5 The advisor also agreed to waive an additional 0.09 percentage points of the fund’s management fee. The advisor expects this fee waiver to continue until November 30, 2019 and cannot terminate it prior to such date without the approval of the Board of Trustees.