Document and Entity Information	0 Months Ended
	Dec. 31, 2012
Risk/Return:
Document Type	485BPOS
Document Period End Date	Dec. 31, 2012
Registrant Name	DREYFUS FUNDS INC
Central Index Key	0000038403
Amendment Flag	false
Document Creation Date	Apr. 26, 2013
Document Effective Date	May 01, 2013
Prospectus Date	May 01, 2013
Dreyfus Mid-Cap Growth Fund | Class A
Risk/Return:
Trading Symbol	FRSDX
Dreyfus Mid-Cap Growth Fund | Class C
Risk/Return:
Trading Symbol	FRSCX
Dreyfus Mid-Cap Growth Fund | Class F
Risk/Return:
Trading Symbol	FRSPX
Dreyfus Mid-Cap Growth Fund | Class I
Risk/Return:
Trading Symbol	FRSRX