Document and Entity Information - shares	9 Months Ended
	Apr. 30, 2019	May 31, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Apr. 30, 2019
Current Fiscal Year End Date	--07-31
Document Fiscal Period Focus	Q3
Document Fiscal Year Focus	2019
Entity Registrant Name	COMTECH TELECOMMUNICATIONS CORP /DE/
Trading Symbol	CMTL
Entity Central Index Key	0000023197
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		24,137,882