v3.26.1
Expense Example
Jul. 27, 2026
USD ($)
T. Rowe Price New Income Fund-Investor Class [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year $ 45
Expense Example, with Redemption, 3 Years 172
Expense Example, with Redemption, 5 Years 310
Expense Example, with Redemption, 10 Years 712
T. Rowe Price New Income Fund-I Class [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 37
Expense Example, with Redemption, 3 Years 116
Expense Example, with Redemption, 5 Years 202
Expense Example, with Redemption, 10 Years 456
T. Rowe Price New Income Fund-Advisor Class [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 94
Expense Example, with Redemption, 3 Years 394
Expense Example, with Redemption, 5 Years 716
Expense Example, with Redemption, 10 Years 1,628
T. Rowe Price New Income Fund-R Class [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 110
Expense Example, with Redemption, 3 Years 420
Expense Example, with Redemption, 5 Years 753
Expense Example, with Redemption, 10 Years 1,693
T. Rowe Price New Income Fund-Z Class [Member]  
Prospectus [Line Items]  
Expense Example, with Redemption, 1 Year 0
Expense Example, with Redemption, 3 Years 0
Expense Example, with Redemption, 5 Years 0
Expense Example, with Redemption, 10 Years $ 0