Investment Objectives and Goals - Calvert Fund	Sep. 30, 2025
Calvert Core Bond Fund
Prospectus [Line Items]
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The Fund’s investment objective is to seek total return with an emphasis on income.
Calvert High Yield Bond Fund
Prospectus [Line Items]
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The Fund’s investment objective is to seek high current income and capital appreciation, secondarily.
Calvert Income Fund
Prospectus [Line Items]
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The Fund’s investment objective is to seek to maximize income, to the extent consistent with preservation of capital, through investment in bonds and income-producing securities.
Calvert Mortgage Access Fund
Prospectus [Line Items]
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The Fund’s investment objective is total return.
Calvert Short Duration Income Fund
Prospectus [Line Items]
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The Fund’s investment objective is to seek to maximize income, to the extent consistent with preservation of capital, through investment in short-term bonds and income-producing securities.
Calvert Ultra-Short Duration Income Fund
Prospectus [Line Items]
Objective [Heading]	Investment Objective
Objective, Primary [Text Block]	The Fund’s investment objective is to seek to maximize income, to the extent consistent with preservation of capital, through investment in short-term bonds and income-producing securities.

The Fund’s investment objective is to seek total return with an emphasis on income.

The Fund’s investment objective is to seek high current income and capital appreciation, secondarily.

The Fund’s investment objective is to seek to maximize income, to the extent consistent with preservation of capital, through investment in bonds and income-producing securities.

Prospectus [Line Items]

Objective, Primary [Text Block]

The Fund’s investment objective is total return.

Prospectus [Line Items]

Objective, Primary [Text Block]

The Fund’s investment objective is to seek to maximize income, to the extent consistent with preservation of capital, through investment in short-term bonds and income-producing securities.

Prospectus [Line Items]

Objective, Primary [Text Block]

The Fund’s investment objective is to seek to maximize income, to the extent consistent with preservation of capital, through investment in short-term bonds and income-producing securities.