Legal Proceedings and Other Matters (Details) (Mobile Data Communications Segment [Member], USD $)	Jan. 31, 2013
Mobile Data Communications Segment [Member]
Funded orders received under August 2007 BFT-1 contract	$ 377,342,000
Minimum U.S. government contract value that may be subject to full Cost Accounting Standards (CAS) coverage	50,000,000
Preliminary DCAA price adjustment	11,852,000
Preliminary DCAA interest estimate	$ 2,326,000

Minimum U.S. government contract value that may be subject to full Cost Accounting Standards (CAS) coverage

No definition available.

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Namespace Prefix:	cmtl_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant