<?xml version="1.0"?>
<ownershipDocument>

    <schemaVersion>X0202</schemaVersion>

    <documentType>3</documentType>

    <periodOfReport>2008-01-28</periodOfReport>

    <noSecuritiesOwned>0</noSecuritiesOwned>

    <issuer>
        <issuerCik>0000093631</issuerCik>
        <issuerName>FREDERICK'S OF HOLLYWOOD GROUP INC /NY/</issuerName>
        <issuerTradingSymbol>FOH</issuerTradingSymbol>
    </issuer>

    <reportingOwner>
        <reportingOwnerId>
            <rptOwnerCik>0001424983</rptOwnerCik>
            <rptOwnerName>LoRe Linda</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FREDERICK'S OF HOLLYWOOD GROUP INC.</rptOwnerStreet1>
            <rptOwnerStreet2>(FORMERLY MOVIE STAR, INC.)</rptOwnerStreet2>
            <rptOwnerCity>6255 SUNSET BLVD., HOLLYWOOD</rptOwnerCity>
            <rptOwnerState>CA</rptOwnerState>
            <rptOwnerZipCode>90028</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>1</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
            <officerTitle>President &amp; CEO, FOH Division</officerTitle>
        </reportingOwnerRelationship>
    </reportingOwner>

    <nonDerivativeTable>
        <nonDerivativeHolding>
            <securityTitle>
                <value>Common Stock</value>
            </securityTitle>
            <postTransactionAmounts>
                <sharesOwnedFollowingTransaction>
                    <value>200000</value>
                    <footnoteId id="F1"/>
                </sharesOwnedFollowingTransaction>
            </postTransactionAmounts>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </nonDerivativeHolding>
    </nonDerivativeTable>

    <derivativeTable>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>1.90</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2003-12-02</value>
            </exerciseDate>
            <expirationDate>
                <value>2013-12-01</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>244907</value>
                    <footnoteId id="F2"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>2.46</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2006-12-08</value>
            </exerciseDate>
            <expirationDate>
                <value>2016-12-07</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>240455</value>
                    <footnoteId id="F3"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
        <derivativeHolding>
            <securityTitle>
                <value>Stock Option (Right to Buy)</value>
            </securityTitle>
            <conversionOrExercisePrice>
                <value>3.10</value>
            </conversionOrExercisePrice>
            <exerciseDate>
                <value>2008-01-28</value>
            </exerciseDate>
            <expirationDate>
                <value>2018-01-27</value>
            </expirationDate>
            <underlyingSecurity>
                <underlyingSecurityTitle>
                    <value>Common Stock</value>
                </underlyingSecurityTitle>
                <underlyingSecurityShares>
                    <value>100000</value>
                    <footnoteId id="F4"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares of restricted stock assumed by the Issuer pursuant to that certain Agreement and Plan of Merger and Reorganization, dated as of December 18, 2006, as amended, by and among the Issuer, FOH Holdings, Inc. (&quot;FOH Holdings&quot;) and Fred Merger Corp. upon the consummation of the merger with FOH Holdings on January 28, 2008 (the &quot;Merger&quot;). 100,000 of these shares will vest on December 31, 2009 and 50,000 shares will vest on each of December 31, 2010 and 2011, provided that the Reporting Person is employed by the Issuer on such dates.</footnote>
        <footnote id="F2">Represents shares issuable upon exercise of an immediately exercisable option assumed by the Issuer upon consummation of the Merger.</footnote>
        <footnote id="F3">Represents shares issuable upon exercise of an option assumed by the Issuer upon the consummation of the Merger. 60,114 of these shares vested on January 26, 2008 and 60,114 shares will vest on each of the last Saturday in January 2009 and 2010, and 60,113 shares will vest on the last Saturday in January 2011.</footnote>
        <footnote id="F4">Represents shares issuable upon exercise of an option granted to the Reporting Person upon the consummation of the Merger. 25,000 of these shares vested on January 28, 2008 and 75,000 shares will vest in three equal annual installments on each of the first, second and third anniversaires of the date of grant.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Linda LoRe</signatureName>
        <signatureDate>2008-02-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
