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DERIVATIVE INSTRUMENTS (Schedule Of Derivative Instruments) (Balance Sheets) (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivatives designated as hedging instruments [Member] | Foreign exchange forward contracts [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other account receivables and prepaid expenses | $ 303 | $ 21
Other account payables and accrued expenses |  | (277)
Other comprehensive income (loss) | 303 | (256)
Derivatives not designated as hedging instruments [Member] | Foreign exchange forward contracts and other derivatives [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Other account receivables and prepaid expenses | 148 | 176
Other account payables and accrued expenses | $ (457) | $ (79)

X
- Definition Other comprehensive income (loss). + References No definition available. + Details
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Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other account payables and accrued expenses. + References No definition available. + Details
Name: | crnt_DerivativeInstrumentsOtherAccountPayablesAndAccruedExpenses
Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Other account receivables and prepaid expenses. + References No definition available. + Details
Name: | crnt_DerivativeInstrumentsOtherAccountReceivablesAndPrepaidExpenses
Namespace Prefix: | crnt_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_DerivativeInstrumentsGainLossLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_DesignatedAsHedgingInstrumentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=us-gaap_ForeignExchangeForwardMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_HedgingDesignationAxis=us-gaap_NondesignatedMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_DerivativeInstrumentRiskAxis=crnt_ForeignExchangeForwardContractsAndOtherDerivativesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |