<?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>0001183922</rptOwnerCik>
            <rptOwnerName>WALTERS MILTON J</rptOwnerName>
        </reportingOwnerId>
        <reportingOwnerAddress>
            <rptOwnerStreet1>C/O FREDERICK'S OF HOLLYWOOD GROUP INC.</rptOwnerStreet1>
            <rptOwnerStreet2>(FORMERLY MOVIE STAR, INC.)</rptOwnerStreet2>
            <rptOwnerCity>1115 BROADWAY, NEW YORK</rptOwnerCity>
            <rptOwnerState>NY</rptOwnerState>
            <rptOwnerZipCode>10010</rptOwnerZipCode>
            <rptOwnerStateDescription></rptOwnerStateDescription>
        </reportingOwnerAddress>
        <reportingOwnerRelationship>
            <isDirector>1</isDirector>
            <isOfficer>0</isOfficer>
            <isTenPercentOwner>0</isTenPercentOwner>
            <isOther>0</isOther>
        </reportingOwnerRelationship>
    </reportingOwner>

    <derivativeTable>
        <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>31170</value>
                    <footnoteId id="F1"/>
                </underlyingSecurityShares>
            </underlyingSecurity>
            <ownershipNature>
                <directOrIndirectOwnership>
                    <value>D</value>
                </directOrIndirectOwnership>
                <natureOfOwnership>
                    <value></value>
                </natureOfOwnership>
            </ownershipNature>
        </derivativeHolding>
    </derivativeTable>

    <footnotes>
        <footnote id="F1">Represents shares issuable upon exercise of an option 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 consummation of the merger with FOH Holdings on January 28, 2008. 13,359 of these shares vested on December 8, 2006, 4,453 of these shares vested on January 26, 2008, 4,453 shares will vest on each of the last Saturday of January 2009 and 2010 and 4,552 shares will vest on the last Saturday of January 2011.</footnote>
    </footnotes>

    <remarks></remarks>

    <ownerSignature>
        <signatureName>Milton J. Walters</signatureName>
        <signatureDate>2008-02-05</signatureDate>
    </ownerSignature>
</ownershipDocument>
