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Cover - USD ($)
 12 Months Ended
Jul. 31, 2021
Sep. 30, 2021
Jan. 31, 2021
Cover [Abstract]      
Document Type 10-K    
Document Annual Report true    
Document Period End Date Jul. 31, 2021    
Document Transition Report false    
Entity File Number 0-7928    
Entity Registrant Name COMTECH TELECOMMUNICATIONS CORP /DE/    
Amendment Flag false    
Current Fiscal Year End Date --07-31    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2021    
Entity Central Index Key 0000023197    
Entity Incorporation, State or Country Code DE    
Entity Tax Identification Number 11-2139466    
Entity Address, Address Line One 68 South Service Road    
Entity Address, Address Line Two Suite 230    
Entity Address, City or Town Melville    
Entity Address, State or Province NY    
Entity Address, Postal Zip Code 11747    
City Area Code (631)    
Local Phone Number 962-7000    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
ICFR Auditor Attestation Flag true    
Entity Shell Company false    
Entity Public Float     $ 523,931,000
Entity Common Stock, Shares Outstanding   26,335,695  
Documents Incorporated by Reference
DOCUMENTS INCORPORATED BY REFERENCE.


Certain portions of the document listed below have been incorporated by reference into the indicated Part of this Annual Report on Form 10-K:


Proxy Statement for 2021 Annual Meeting of Stockholders - Part III
    
Common Stock, par value $.10 per share      
Document Information [Line Items]      
Title of 12(b) Security Common Stock, par value $.10 per share    
Trading Symbol CMTL    
Security Exchange Name NASDAQ    
Series A Junior Participating Cumulative Preferred Stock, par value $0.10 per share      
Document Information [Line Items]      
Title of 12(b) Security Series A Junior Participating Cumulative Preferred Stock, par value $0.10 per share