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SIGNIFICANT ACCOUNTING POLICIES (Schedule Of Annual Depreciation Rates) (Details)	Dec. 31, 2016
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%
Enterprise Resource Planning systems ("ERP") [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	10.00%
Office furniture and equipment [Member]
Significant Accounting Policies [Line Items]
Depreciation rate	15.00%

X

- Definition

Depreciation rate

+ References

No definition available.

+ Details

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Namespace Prefix:	crnt_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Definition

Significant Accounting Policies [Line Items]

+ References

No definition available.

+ Details

Name:	crnt_SignificantAccountingPoliciesLineItems
Namespace Prefix:	crnt_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

X

- Details

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

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MinimumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_RangeAxis=us-gaap_MaximumMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_PropertyPlantAndEquipmentByTypeAxis=crnt_EnterpriseResourcePlanningSystemsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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