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Risk/Return:rr_RiskReturnAbstract 
Document Typedei_DocumentTypeOther
Document Period End Datedei_DocumentPeriodEndDateSep. 30, 2010
Registrant Namedei_EntityRegistrantNameKEELEY FUNDS, INC.
Central Index Keydei_EntityCentralIndexKey0001324203
Amendment Flagdei_AmendmentFlagfalse
Document Creation Datedei_DocumentCreationDateOct. 01, 2011
Document Effective Datedei_DocumentEffectiveDateOct. 01, 2011
Prospectus Daterr_ProspectusDateJan. 31, 2011
Keeley Mid Cap Value Fund
 
Risk/Return:rr_RiskReturnAbstract 
Supplement [Text Block]kfi1324203_SupplementTextBlock

KEELEY FUNDS, INC.

Supplement dated October 1, 2011 to the

Prospectus dated January 31, 2011

1. The following paragraph replaces in its entirety the first paragraph in the section “Principal Investment Strategies and Policies” on page 17 of the Prospectus:

The Fund intends to pursue its investment objective by investing in companies with a mid-size market capitalization, which we currently define as between $1.5 billion and $15 billion. Under normal market conditions, the Fund will invest no less than 80% of its net assets plus the amount of any borrowings for investment purposes in common stocks and other equity type securities (including preferred stock, convertible debt securities and warrants) of mid-size market capitalization. As long as an investment continues to meet the Fund’s other criteria, the Fund may choose to hold such securities even if the company grows beyond the $15 billion capitalization level. If less than 80% of the Fund’s assets (plus the amount of any borrowings for investment purposes) are invested in such companies, the Fund will not invest in companies other than those with a mid-size market capitalization until the 80% threshold is restored.