Document and Entity Information - shares	3 Months Ended
	Oct. 31, 2017	Dec. 01, 2017
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2017
Current Fiscal Year End Date	--07-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2018
Entity Registrant Name	COMTECH TELECOMMUNICATIONS CORP /DE/
Entity Central Index Key	0000023197
Entity Filer Category	Accelerated Filer
Entity Common Stock, Shares Outstanding		23,607,565