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Commitments And Contingent Liabilities (Narrative) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Operating Leased Assets [Line Items]
Bank guarantees	$ 27,890us-gaap_GuaranteeObligationsCurrentCarryingValue	$ 36,706us-gaap_GuaranteeObligationsCurrentCarryingValue
Indirect tax liabilities	11,448crnt_AccruedIndirectTaxesNoncurrent	16,467crnt_AccruedIndirectTaxesNoncurrent
Income from decrease of provision of pre-acquisition indirect tax exposures	3,027us-gaap_ProceedsFromIncomeTaxRefunds	7,657us-gaap_ProceedsFromIncomeTaxRefunds	0us-gaap_ProceedsFromIncomeTaxRefunds
Grants received	1,760us-gaap_RevenueFromGrants	660us-gaap_RevenueFromGrants
Facilities [Member]
Operating Leased Assets [Line Items]
Operating lease expense	5,426us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_FacilitiesMember	8,182us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_FacilitiesMember	8,473us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = crnt_FacilitiesMember
Motor Vehicles [Member]
Operating Leased Assets [Line Items]
Operating lease expense	$ 1,174us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember	$ 1,568us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember	$ 1,404us-gaap_OperatingLeasesRentExpenseNet / us-gaap_PropertyPlantAndEquipmentByTypeAxis = us-gaap_VehiclesMember

X

- Definition

Accrued Indirect Taxes.

+ References

No definition available.

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X

- Definition

The current carrying amount of the liability for the freestanding or embedded guarantor's obligations under the guarantee or each group of similar guarantees.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 460

-SubTopic 10

-Section 50

-Paragraph 4

-Subparagraph (c)

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X

- Definition

Rental expense for the reporting period incurred under operating leases, including minimum and any contingent rent expense, net of related sublease income.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 840

-SubTopic 20

-Section 50

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- Definition

The amount of cash received during the period as refunds for the overpayment of taxes.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 2

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4297-108586



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- Definition

Revenue earned during the period from non-repayable sum of money awarded to an entity to carry out a specific purpose as provided in grant agreements.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

-Topic 225

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