0000889169 2013-01-31 2013-01-31 0000889169 ck0000889169:S000000296Member ck0000889169:S000000296Member 2013-01-31 2013-01-31 0000889169 ck0000889169:S000000296Member ck0000889169:S000000296Member ck0000889169:C000000723Member 2013-01-31 2013-01-31 0000889169 ck0000889169:S000000296Member ck0000889169:S000000296Member ck0000889169:C000000724Member 2013-01-31 2013-01-31 0000889169 ck0000889169:S000000296Member ck0000889169:S000000296Member ck0000889169:C000055536Member 2013-01-31 2013-01-31 Dreyfus Investment Grade Funds, Inc. Other false 0000889169 2013-01-31 2013-01-31 2013-01-31 2012-12-01 Dreyfus Intermediate Term Income Fund DRITX DITIX DTECX Effective February 1, 2013, The Dreyfus Corporation has contractually agreed, until January 31, 2014, to waive receipt of its fees and/or assume the expenses of the fund’s Class I shares, so that the expenses of the fund’s Class I shares (excluding taxes, interest, brokerage commissions, commitment fees on borrowings and extraordinary expenses) do not exceed 0.55%. 2014-01-31 DREYFUS INVESTMENT GRADE FUNDS, INC. -DREYFUS INTERMEDIATE TERM INCOME FUND Supplement to Summary and Statutory Prospectus dated December 1, 2012             The following information supplements the information contained in the section of the fund’s prospectus entitled “Fees and Expenses”: