Document and Entity Information (USD $)	12 Months Ended
	Jun. 30, 2013	Aug. 28, 2013	Dec. 31, 2012
Document And Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jun. 30, 2013
Document Fiscal Year Focus	2013
Document Fiscal Period Focus	FY
Trading Symbol	SYMM
Entity Registrant Name	SYMMETRICOM INC
Entity Central Index Key	0000082628
Current Fiscal Year End Date	--06-30
Entity Well-known Seasoned Issuer	No
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		41,319,056
Entity Public Float			$ 234,000,000