Document and Entity Information (USD $)	12 Months Ended
	Jul. 31, 2011	Sep. 23, 2011	Jan. 31, 2011
Document and Entity Information [Abstract]
Document Type	10-K
Amendment Flag	false
Document Period End Date	Jul. 31, 2011
Current Fiscal Year End Date	--07-31
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2011
Entity Registrant Name	COMTECH TELECOMMUNICATIONS CORP /DE/
Entity Central Index Key	0000023197
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		23,463,139
Entity Public Float			$ 741,766,000
Entity Current Reporting Status	Yes
Entity Voluntary Filers	No
Entity Well-known Seasoned Issuer	Yes