Document and Entity Information - shares	3 Months Ended
	Oct. 31, 2019	Nov. 29, 2019
Document and Entity Information [Abstract]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Oct. 31, 2019
Current Fiscal Year End Date	--07-31
Document Fiscal Period Focus	Q1
Document Fiscal Year Focus	2020
Entity Registrant Name	COMTECH TELECOMMUNICATIONS CORP /DE/
Entity Central Index Key	0000023197
Entity Filer Category	Accelerated Filer
Entity Emerging Growth Company	false
Entity Small Business	false
Entity Common Stock, Shares Outstanding		24,389,774