Document and Entity Information (USD $)	12 Months Ended
	Jul. 01, 2012	Aug. 31, 2012	Jan. 01, 2012
Document And Entity Information [Abstract]
Entity Registrant Name	SYMMETRICOM INC
Entity Central Index Key	0000082628
Document Type	10-K
Document Period End Date	Jul. 01, 2012
Amendment Flag	false
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	FY
Current Fiscal Year End Date	--07-01
Entity Well-known Seasoned Issuer	No
Entity Voluntary Filers	No
Entity Current Reporting Status	Yes
Entity Filer Category	Accelerated Filer
Entity Public Float			$ 226,983,000
Entity Common Stock, Shares Outstanding		40,723,768