Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Registrant Name

dei_EntityRegistrantName

T. Rowe Price New Income Fund, Inc.

Prospectus Date

rr_ProspectusDate

Oct. 01, 2017

Supplement [Text Block]

trpnifi_SupplementTextBlock

T. Rowe Price New Income Fund

Supplement to Prospectus and Summary Prospectus Dated October 1, 2017, as supplemented

On July 25, 2018, the T. Rowe Price New Income Fund’s shareholders approved a proposal to amend the fund’s investment objective. The change will go into effect on August 1, 2018. Accordingly, the investment objective on page 1 is revised as follows:

“The fund seeks to maximize total return through income and capital appreciation.”

T. Rowe Price New Income Fund, Inc.

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

trpnifi_SupplementTextBlock

T. Rowe Price New Income Fund

Supplement to Prospectus and Summary Prospectus Dated October 1, 2017, as supplemented

On July 25, 2018, the T. Rowe Price New Income Fund’s shareholders approved a proposal to amend the fund’s investment objective. The change will go into effect on August 1, 2018. Accordingly, the investment objective on page 1 is revised as follows:

“The fund seeks to maximize total return through income and capital appreciation.”