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SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Annual Depreciation Rates) (Details) | Dec. 31, 2020
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Computers, manufacturing and peripheral equipment [Member] | Minimum [Member] |
Significant Accounting Policies [Line Items] |
Depreciation rate | 6.00%
Computers, manufacturing and peripheral equipment [Member] | Maximum [Member] |
Significant Accounting Policies [Line Items] |
Depreciation rate | 33.00%
Office furniture and equipment [Member] |
Significant Accounting Policies [Line Items] |
Depreciation rate | 15.00%

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- Definition Significant Accounting Policies [Line Items] + References No definition available. + Details
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Namespace Prefix: | crnt_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Stated as a percentage, the estimated or actual value of the asset at the end of its useful life or when it is no longer serviceable (cannot be used for its original purpose) divided by its [historical] capitalized cost. + References No definition available. + Details
Name: | us-gaap_PropertyPlantAndEquipmentSalvageValuePercentage
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_EquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | srt_RangeAxis=srt_MinimumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | srt_RangeAxis=srt_MaximumMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
Name: | us-gaap_PropertyPlantAndEquipmentByTypeAxis=us-gaap_OtherMachineryAndEquipmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |