Label	Element	Value
Risk/Return:	rr_RiskReturnAbstract
Document Type	dei_DocumentType	Other
Document Period End Date	dei_DocumentPeriodEndDate	Jul. 07, 2011
Registrant Name	dei_EntityRegistrantName	FIDELITY DEVONSHIRE TRUST
Central Index Key	dei_EntityCentralIndexKey	0000035341
Amendment Flag	dei_AmendmentFlag	false
Document Creation Date	dei_DocumentCreationDate	Jul. 07, 2011
Document Effective Date	dei_DocumentEffectiveDate	Jul. 07, 2011
Prospectus Date	rr_ProspectusDate	Apr. 01, 2011
Retail \| Fidelity Large Cap Value Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fdt35341_SupplementTextBlock	Supplement to the Fidelity^® Large Cap Value Fund April 1, 2011 Prospectus The Board of Trustees of Fidelity Large Cap Value Fund has approved certain changes effective on August 31, 2011, including changing the name "Fidelity Large Cap Value Fund" to "Fidelity Stock Selector Large Cap Value Fund" and modifying the fund's investment policies. Effective August 31, 2011, the first bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed. Effective August 31, 2011, the following bullet replaces similar language in the second bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4. Normally investing at least 80% of assets in stocks of companies with large market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 1000^® Index or the S&P 500^® Index). The fourth bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed. The following bullet supplements the information found under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4. Allocating the fund's assets across different market sectors (at present, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, telecom services, and utilities), using different Fidelity managers.
ATBC \| Fidelity Large Cap Value Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fdt35341_SupplementTextBlock	Supplement to the Fidelity Advisor^® Large Cap Value Fund Class A, Class T, Class B, and Class C April 1, 2011 Prospectus The Board of Trustees of Fidelity^® Large Cap Value Fund has approved certain changes effective August 31, 2011, including changing the name "Fidelity Large Cap Value Fund" to "Fidelity Stock Selector Large Cap Value Fund" and modifying the fund's investment polices. Effective August 31, 2011, the first bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed. Effective August 31, 2011, the following bullet replaces similar language in the second bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4. Normally investing at least 80% of assets in stocks of companies with large market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 1000^® Index or the S&P 500^® Index). The fourth bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed. The following bullet supplements the information found under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4. Allocating the fund's assets across different market sectors (at present, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, telecom services, and utilities), using different Fidelity managers.
Inst \| Fidelity Large Cap Value Fund
Risk/Return:	rr_RiskReturnAbstract
Supplement [Text Block]	fdt35341_SupplementTextBlock	Supplement to the Fidelity Advisor^® Large Cap Value Fund Institutional Class April 1, 2011 Prospectus The Board of Trustees of Fidelity^® Large Cap Value Fund has approved certain changes effective August 31, 2011, including changing the name "Fidelity Large Cap Value Fund" to "Fidelity Stock Selector Large Cap Value Fund" and modifying the fund's investment policies. Effective August 31, 2011, the first bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed. Effective August 31, 2011, the following bullet replaces similar language in the second bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4. Normally investing at least 80% of assets in stocks of companies with large market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 1000^® Index or the S&P 500^®Index). The fourth bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed. The following bullet supplements the information found under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4. Allocating the fund's assets across different market sectors (at present, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, telecom services, and utilities), using different Fidelity managers.

Label

Element

Value

Risk/Return:

rr_RiskReturnAbstract

Document Type

dei_DocumentType

Other

Document Period End Date

dei_DocumentPeriodEndDate

Jul. 07, 2011

Registrant Name

dei_EntityRegistrantName

FIDELITY DEVONSHIRE TRUST

Central Index Key

dei_EntityCentralIndexKey

0000035341

Amendment Flag

dei_AmendmentFlag

false

Document Creation Date

dei_DocumentCreationDate

Jul. 07, 2011

Document Effective Date

dei_DocumentEffectiveDate

Jul. 07, 2011

Prospectus Date

rr_ProspectusDate

Apr. 01, 2011

Retail | Fidelity Large Cap Value Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

fdt35341_SupplementTextBlock

Supplement to the

Fidelity^® Large Cap Value Fund

April 1, 2011

Prospectus

The Board of Trustees of Fidelity Large Cap Value Fund has approved certain changes effective on August 31, 2011, including changing the name "Fidelity Large Cap Value Fund" to "Fidelity Stock Selector Large Cap Value Fund" and modifying the fund's investment policies.

Effective August 31, 2011, the first bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed.

Effective August 31, 2011, the following bullet replaces similar language in the second bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4.

Normally investing at least 80% of assets in stocks of companies with large market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 1000^® Index or the S&P 500^® Index).

The fourth bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed.

The following bullet supplements the information found under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4.

Allocating the fund's assets across different market sectors (at present, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, telecom services, and utilities), using different Fidelity managers.

ATBC | Fidelity Large Cap Value Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

fdt35341_SupplementTextBlock

Supplement to the

Fidelity Advisor^® Large Cap Value Fund

Class A, Class T, Class B, and Class C

April 1, 2011

Prospectus

The Board of Trustees of Fidelity^® Large Cap Value Fund has approved certain changes effective August 31, 2011, including changing the name "Fidelity Large Cap Value Fund" to "Fidelity Stock Selector Large Cap Value Fund" and modifying the fund's investment polices.

Effective August 31, 2011, the first bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed.

Effective August 31, 2011, the following bullet replaces similar language in the second bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4.

Normally investing at least 80% of assets in stocks of companies with large market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 1000^® Index or the S&P 500^® Index).

The fourth bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed.

The following bullet supplements the information found under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4.

Allocating the fund's assets across different market sectors (at present, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, telecom services, and utilities), using different Fidelity managers.

Inst | Fidelity Large Cap Value Fund

Risk/Return:

rr_RiskReturnAbstract

Supplement [Text Block]

fdt35341_SupplementTextBlock

Supplement to the

Fidelity Advisor^® Large Cap Value Fund

Institutional Class

April 1, 2011

Prospectus

Effective August 31, 2011, the first bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed.

Effective August 31, 2011, the following bullet replaces similar language in the second bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4.

Normally investing at least 80% of assets in stocks of companies with large market capitalizations (which, for purposes of this fund, are those companies with market capitalizations similar to companies in the Russell 1000^® Index or the S&P 500^®Index).

The fourth bullet under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4 has been removed.

The following bullet supplements the information found under the heading "Principal Investment Strategies" in the "Fund Summary" section on page 4.

Allocating the fund's assets across different market sectors (at present, consumer discretionary, consumer staples, energy, financials, health care, industrials, information technology, materials, telecom services, and utilities), using different Fidelity managers.