v3.26.1
Shareholder Fees - American Century Government Income Trust
Aug. 01, 2026
USD ($)
CAPITAL PRESERVATION FUND | CAPITAL PRESERVATION FUND INVESTOR CLASS  
Prospectus [Line Items]  
Maximum Account Fee $ 25
GINNIE MAE FUND | GINNIE MAE FUND INVESTOR CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 25
GINNIE MAE FUND | GINNIE MAE FUND I CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
GINNIE MAE FUND | GINNIE MAE FUND A CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 4.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00% [1]
Maximum Account Fee $ 0
GINNIE MAE FUND | GINNIE MAE FUND C CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00%
Maximum Account Fee $ 0
GINNIE MAE FUND | GINNIE MAE FUND R CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
GINNIE MAE FUND | GINNIE MAE FUND R5 CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND INVESTOR CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 25
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND I CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND A CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 4.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00% [2]
Maximum Account Fee $ 0
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND C CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00%
Maximum Account Fee $ 0
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND R CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND R5 CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND INVESTOR CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 25
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND I CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND A CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 2.25%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00% [3]
Maximum Account Fee $ 0
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND C CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00%
Maximum Account Fee $ 0
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND R CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND R5 CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND INVESTOR CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 25
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND I CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND Y CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND A CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 4.50%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00% [4]
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND C CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 1.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND R CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND R5 CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND R6 CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND G CLASS  
Prospectus [Line Items]  
Maximum Sales Charge Imposed on Purchases (as a percentage of Offering Price) 0.00%
Maximum Deferred Sales Charge (as a percentage of Offering Price) 0.00%
Maximum Account Fee $ 0
[1] Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.
[2] Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.
[3] Purchases of $500,000 or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.
[4] Purchases of $1 million or more may be subject to a contingent deferred sales charge of 1.00% if the shares are redeemed within one year of the date of purchase.