v3.26.1
Shareholder Report
 6 Months Ended
Apr. 30, 2026
USD ($)
holding
Shareholder Report [Line Items]  
Document Type N-CSRS
Amendment Flag false
Registrant Name AMERICAN CENTURY INTERNATIONAL BOND FUNDS
Entity Central Index Key 0000880268
Entity Investment Company Type N-1A
Document Period End Date Apr. 30, 2026
Shareholder Report Annual or Semi-Annual Semi-Annual Shareholder Report
C000144189 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name Investor Class
Trading Symbol AEDVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class$460.91%
Expenses Paid, Amount $ 46
Expense Ratio, Percent 0.91%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000189713 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name I Class
Trading Symbol AEHDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021.
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
I Class$410.81%
Expenses Paid, Amount $ 41
Expense Ratio, Percent 0.81%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000189714 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name Y Class
Trading Symbol AEYDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Y Class$360.71%
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.71%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000144191 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name A Class
Trading Symbol AEDQX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
A Class$581.16%
Expenses Paid, Amount $ 58
Expense Ratio, Percent 1.16%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000144192 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name C Class
Trading Symbol AEDHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
C Class$961.91%
Expenses Paid, Amount $ 96
Expense Ratio, Percent 1.91%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
 
C000144193 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name R Class
Trading Symbol AEDWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
R Class$711.41%
Expenses Paid, Amount $ 71
Expense Ratio, Percent 1.41%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
 
C000144190 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name R5 Class
Trading Symbol AEDJX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
R5 Class$360.71%
Expenses Paid, Amount $ 36
Expense Ratio, Percent 0.71%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000144194 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name R6 Class
Trading Symbol AEXDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
R6 Class$330.66%
Expenses Paid, Amount $ 33
Expense Ratio, Percent 0.66%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000194401 [Member]  
Shareholder Report [Line Items]  
Fund Name Emerging Markets Debt Fund
Class Name G Class
Trading Symbol AEDGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Emerging Markets Debt Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
G Class$20.03%
Expenses Paid, Amount $ 2
Expense Ratio, Percent 0.03%
Net Assets $ 456,938,643
Holdings Count | holding 145
Advisory Fees Paid, Amount $ 511,555
Investment Company, Portfolio Turnover 61.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Sovereign Governments and Agencies78.4%
Corporate Bonds12.8%
U.S. Treasury Securities2.0%
Preferred Securities0.1%
Convertible Preferred Securities0.1%
Short-Term Investments6.3%
Other Assets and Liabilities0.3%
 
C000109545 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name Investor Class
Trading Symbol AGBVX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Investor Class$420.85%
Expenses Paid, Amount $ 42
Expense Ratio, Percent 0.85%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000189710 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name I Class
Trading Symbol AGBHX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
I Class$370.75%
Expenses Paid, Amount $ 37
Expense Ratio, Percent 0.75%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000189711 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name Y Class
Trading Symbol AGBWX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
Y Class$320.65%
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000109547 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name A Class
Trading Symbol AGBAX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
A Class$551.10%
Expenses Paid, Amount $ 55
Expense Ratio, Percent 1.10%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000109548 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name C Class
Trading Symbol AGBTX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
C Class$921.85%
Expenses Paid, Amount $ 92
Expense Ratio, Percent 1.85%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000109549 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name R Class
Trading Symbol AGBRX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
R Class$671.35%
Expenses Paid, Amount $ 67
Expense Ratio, Percent 1.35%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000109546 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name R5 Class
Trading Symbol AGBNX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
R5 Class$320.65%
Expenses Paid, Amount $ 32
Expense Ratio, Percent 0.65%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000131612 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name R6 Class
Trading Symbol AGBDX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
R6 Class$300.60%
Expenses Paid, Amount $ 30
Expense Ratio, Percent 0.60%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%
 
 
 
C000194400 [Member]  
Shareholder Report [Line Items]  
Fund Name Global Bond Fund
Class Name G Class
Trading Symbol AGBGX
Annual or Semi-Annual Statement [Text Block] This semi-annual shareholder report contains important information about Global Bond Fund for the period of November 1, 2025 to April 30, 2026.
Shareholder Report Annual or Semi-Annual semi-annual shareholder report
Additional Information [Text Block] You can find additional information about the fund at americancentury.com/docs. You can also request this information by contacting us at 1-800-345-2021.
Additional Information Phone Number 1-800-345-2021
Additional Information Website americancentury.com/docs
Expenses [Text Block]
What were the fund costs for the last six months? (based on a hypothetical $10,000 investment)
Costs of a $10,000 investment
Costs paid as a percentage of a $10,000 investment
G Class$10.02%
Expenses Paid, Amount $ 1
Expense Ratio, Percent 0.02%
Net Assets $ 1,878,836,479
Holdings Count | holding 512
Advisory Fees Paid, Amount $ 2,232,840
Investment Company, Portfolio Turnover 56.00%
Holdings [Text Block]
Fund Holdings
Types of Investments in Portfolio (as a % of net assets)
Corporate Bonds30.9%
Sovereign Governments and Agencies21.8%
Collateralized Mortgage Obligations11.3%
U.S. Government Agency Mortgage-Backed Securities10.5%
Convertible Preferred Securities8.9%
Asset-Backed Securities5.0%
Commercial Mortgage-Backed Securities2.9%
U.S. Treasury Securities2.6%
Preferred Securities2.6%
Municipal Securities0.7%
Collateralized Loan Obligations0.0%
Short-Term Investments3.8%
Other Assets and Liabilities(1.0)%