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Taxes On Income (Schedule Of The Qualifying Percentage Of The Value Of The Productive Assets) (Details) In Millions, unless otherwise specified | 12 Months Ended |
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Dec. 31, 2012 Up to NIS 140 [Member] | Dec. 31, 2012 NIS 140 - NIS 500 [Member] | Dec. 31, 2012 More than NIS 500 [Member] | Dec. 31, 2012 Minimum [Member] NIS 140 - NIS 500 [Member] ILS | Dec. 31, 2012 Minimum [Member] More than NIS 500 [Member] ILS | Dec. 31, 2012 Maximum [Member] Up to NIS 140 [Member] USD ($) | Dec. 31, 2012 Maximum [Member] NIS 140 - NIS 500 [Member] ILS
Taxes On Income [Line Items] |  |  |  |  |  |  |
Value of productive assets before the expansion |  |  |  | 140 | 500 | $ 140 | 500
New proportion that the required investment bears to the value of productive assets | 12.00% | 7.00% | 5.00% |  |  |  |

X
- Definition New proportion that the required investment bears to the value of productive assets + References No definition available. + Details
Name: | crnt_NewProportionThatRequiredInvestmentBearsToValueOfProductiveAssets
Namespace Prefix: | crnt_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | crnt_TaxesOnIncomeLineItems
Namespace Prefix: | crnt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition Value of productive assets before the expansion + References No definition available. + Details
Name: | crnt_ValueOfProductiveAssetsBeforeExpansion
Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant