v3.26.1
Expense Example - American Century Government Income Trust
Aug. 01, 2026
USD ($)
CAPITAL PRESERVATION FUND | CAPITAL PRESERVATION FUND INVESTOR CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 48
Expense Example, with Redemption, 3 Years 151
Expense Example, with Redemption, 5 Years 264
Expense Example, with Redemption, 10 Years 592
GINNIE MAE FUND | GINNIE MAE FUND INVESTOR CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 56
Expense Example, with Redemption, 3 Years 177
Expense Example, with Redemption, 5 Years 308
Expense Example, with Redemption, 10 Years 690
GINNIE MAE FUND | GINNIE MAE FUND I CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 145
Expense Example, with Redemption, 5 Years 252
Expense Example, with Redemption, 10 Years 567
GINNIE MAE FUND | GINNIE MAE FUND A CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 528
Expense Example, with Redemption, 3 Years 694
Expense Example, with Redemption, 5 Years 875
Expense Example, with Redemption, 10 Years 1,396
GINNIE MAE FUND | GINNIE MAE FUND C CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 158
Expense Example, with Redemption, 3 Years 490
Expense Example, with Redemption, 5 Years 845
Expense Example, with Redemption, 10 Years 1,643
GINNIE MAE FUND | GINNIE MAE FUND R CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 107
Expense Example, with Redemption, 3 Years 335
Expense Example, with Redemption, 5 Years 580
Expense Example, with Redemption, 10 Years 1,282
GINNIE MAE FUND | GINNIE MAE FUND R5 CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 36
Expense Example, with Redemption, 3 Years 113
Expense Example, with Redemption, 5 Years 197
Expense Example, with Redemption, 10 Years 444
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND INVESTOR CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 48
Expense Example, with Redemption, 3 Years 151
Expense Example, with Redemption, 5 Years 264
Expense Example, with Redemption, 10 Years 592
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND I CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 38
Expense Example, with Redemption, 3 Years 119
Expense Example, with Redemption, 5 Years 208
Expense Example, with Redemption, 10 Years 469
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND A CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 520
Expense Example, with Redemption, 3 Years 670
Expense Example, with Redemption, 5 Years 833
Expense Example, with Redemption, 10 Years 1,305
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND C CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 150
Expense Example, with Redemption, 3 Years 466
Expense Example, with Redemption, 5 Years 803
Expense Example, with Redemption, 10 Years 1,553
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND R CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 99
Expense Example, with Redemption, 3 Years 310
Expense Example, with Redemption, 5 Years 537
Expense Example, with Redemption, 10 Years 1,190
GOVERNMENT BOND FUND | GOVERNMENT BOND FUND R5 CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 28
Expense Example, with Redemption, 3 Years 87
Expense Example, with Redemption, 5 Years 152
Expense Example, with Redemption, 10 Years 344
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND INVESTOR CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 56
Expense Example, with Redemption, 3 Years 177
Expense Example, with Redemption, 5 Years 308
Expense Example, with Redemption, 10 Years 690
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND I CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 46
Expense Example, with Redemption, 3 Years 145
Expense Example, with Redemption, 5 Years 252
Expense Example, with Redemption, 10 Years 567
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND A CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 305
Expense Example, with Redemption, 3 Years 475
Expense Example, with Redemption, 5 Years 660
Expense Example, with Redemption, 10 Years 1,193
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND C CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 158
Expense Example, with Redemption, 3 Years 490
Expense Example, with Redemption, 5 Years 845
Expense Example, with Redemption, 10 Years 1,643
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND R CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 107
Expense Example, with Redemption, 3 Years 335
Expense Example, with Redemption, 5 Years 580
Expense Example, with Redemption, 10 Years 1,282
SHORT-TERM GOVERNMENT FUND | SHORT-TERM GOVERNMENT FUND R5 CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 36
Expense Example, with Redemption, 3 Years 113
Expense Example, with Redemption, 5 Years 197
Expense Example, with Redemption, 10 Years 444
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND INVESTOR CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 53
Expense Example, with Redemption, 3 Years 167
Expense Example, with Redemption, 5 Years 291
Expense Example, with Redemption, 10 Years 653
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND I CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 43
Expense Example, with Redemption, 3 Years 135
Expense Example, with Redemption, 5 Years 236
Expense Example, with Redemption, 10 Years 530
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND Y CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 33
Expense Example, with Redemption, 3 Years 103
Expense Example, with Redemption, 5 Years 180
Expense Example, with Redemption, 10 Years 406
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND A CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 525
Expense Example, with Redemption, 3 Years 685
Expense Example, with Redemption, 5 Years 859
Expense Example, with Redemption, 10 Years 1,362
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND C CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 155
Expense Example, with Redemption, 3 Years 481
Expense Example, with Redemption, 5 Years 830
Expense Example, with Redemption, 10 Years 1,609
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND R CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 104
Expense Example, with Redemption, 3 Years 325
Expense Example, with Redemption, 5 Years 564
Expense Example, with Redemption, 10 Years 1,248
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND R5 CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 33
Expense Example, with Redemption, 3 Years 103
Expense Example, with Redemption, 5 Years 180
Expense Example, with Redemption, 10 Years 406
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND R6 CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 28
Expense Example, with Redemption, 3 Years 87
Expense Example, with Redemption, 5 Years 152
Expense Example, with Redemption, 10 Years 344
INFLATION-ADJUSTED BOND FUND | INFLATION-ADJUSTED BOND FUND G CLASS  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 6
Expense Example, with Redemption, 3 Years 19
Expense Example, with Redemption, 5 Years 34
Expense Example, with Redemption, 10 Years $ 77