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Label Element Value
Risk/Return: rr_RiskReturnAbstract  
Registrant Name dei_EntityRegistrantName FIDELITY SECURITIES FUND
Prospectus Date rr_ProspectusDate Jan. 28, 2012
A T B C | Fidelity Advisor Growth Strategies Fund
  
Risk/Return: rr_RiskReturnAbstract  
Supplement [Text Block] fsf_SupplementTextBlock

Supplement to the
Fidelity Advisor® Growth Strategies Fund
Class A, Class T, Class B, and Class C
January 28, 2012
Prospectus

Proposed Reorganization. The Board of Trustees of Fidelity Securities Fund and Fidelity Advisor Series I has unanimously approved an Agreement and Plan of Reorganization ("Agreement") between Fidelity Advisor® Growth Strategies Fund and Fidelity Advisor Stock Selector Mid Cap Fund pursuant to which Fidelity Advisor Growth Strategies Fund would be reorganized on a tax-free basis with and into Fidelity Advisor Stock Selector Mid Cap Fund.

The Agreement provides for the transfer of all of the assets of Fidelity Advisor Growth Strategies Fund in exchange for corresponding shares of Fidelity Advisor Stock Selector Mid Cap Fund equal in value to the net assets of Fidelity Advisor Growth Strategies Fund and the assumption by Fidelity Advisor Stock Selector Mid Cap Fund of all of the liabilities of Fidelity Advisor Growth Strategies Fund. After the exchange, Fidelity Advisor Growth Strategies Fund will distribute the Fidelity Advisor Stock Selector Mid Cap shares to its shareholders pro rata, in liquidation of Fidelity Advisor Growth Strategies Fund. As a result, shareholders of Fidelity Advisor Growth Strategies Fund will become shareholders of Fidelity Advisor Stock Selector Mid Cap Fund (these transactions are collectively referred to as the "Reorganization").

A Special Meeting (the "Meeting") of the Shareholders of Fidelity Advisor Growth Strategies Fund is expected to be held during the fourth quarter of 2012 and approval of the Agreement will be voted on at that time. A combined proxy statement and prospectus containing more information with respect to the Reorganization will be provided to shareholders of record of Fidelity Advisor Growth Strategies Fund in advance of the meeting.

If the Agreement is approved at the Meeting and certain conditions required by the Agreement are satisfied, the Reorganization is expected to take place on or about December 14, 2012. If shareholder approval of the Agreement is delayed due to failure to meet a quorum or otherwise, the Reorganization will become effective, if approved, as soon as practicable thereafter.

Effective the close of business on June 29, 2012, new positions in the fund may no longer be opened. Shareholders of the fund on that date may continue to add to their existing fund positions. Investors who did not own shares of the fund on June 29, 2012 generally will not be allowed to buy shares of the fund except that new fund positions may be opened: 1) by participants in most group employer retirement plans (and their successor plans) if the fund had been established (or was in the process of being established) as an investment option under the plans (or under another plan sponsored by the same employer) by June 29, 2012, 2) for accounts managed on a discretionary basis by certain registered investment advisers that have discretionary assets of at least $500 million invested in mutual funds and have included the fund in their discretionary account program since June 29, 2012, 3) by a mutual fund or a qualified tuition program for which FMR or an affiliate serves as investment manager, and 4) by a portfolio manager of the fund. These restrictions generally will apply to investments made directly with Fidelity and investments made through intermediaries. Investors may be required to demonstrate eligibility to buy shares of the fund before an investment is accepted.

The foregoing is not a solicitation of any proxy. For a free copy of the Proxy Statement describing the Reorganization (and containing important information about fees, expenses and risk considerations) and a Prospectus for Fidelity Advisor Stock Selector Mid Cap Fund, please call 1-877-208-0098. The prospectus/proxy statement will also be available for free on the Securities and Exchange Commission's web site (www.sec.gov).

The following information replaces the similar information found under the heading "Year-by-Year Returns" in the "Fund Summary" section on page 6.

Calendar Years
2002
2003
2004
2005
2006
2007
2008
2009
2010
2011
 
-26.79%
30.82%
9.69%
7.16%
8.14%
17.64%
-49.46%
38.84%
24.31%
-9.36%
2002 rr_AnnualReturn2002 (26.79%)
2003 rr_AnnualReturn2003 30.82%
2004 rr_AnnualReturn2004 9.69%
2005 rr_AnnualReturn2005 7.16%
2006 rr_AnnualReturn2006 8.14%
2007 rr_AnnualReturn2007 17.64%
2008 rr_AnnualReturn2008 (49.46%)
2009 rr_AnnualReturn2009 38.84%
2010 rr_AnnualReturn2010 24.31%
2011 rr_AnnualReturn2011 (9.36%)
Supplement Two [Text Block] fsf_SupplementTwoTextBlock
During the periods shown in the chart:
Returns
Quarter ended
Highest Quarter Return
17.43%
September 30, 2009
Lowest Quarter Return
-24.42%
December 31, 2008
Year-to-Date Return
5.45%
June 30, 2012