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Taxes On Income (Schedule Of The Qualifying Percentage Of The Value Of The Productive Assets) (Details) (ILS) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2014
Up to NIS 140 [Member]
Taxes On Income [Line Items]
New proportion that the required investment bears to the value of productive assets	12.00%crnt_NewProportionThatRequiredInvestmentBearsToValueOfProductiveAssets / crnt_ValueOfProductiveAssetsAxis = crnt_UpToNis140Member
NIS 140 - NIS 500 [Member]
Taxes On Income [Line Items]
New proportion that the required investment bears to the value of productive assets	7.00%crnt_NewProportionThatRequiredInvestmentBearsToValueOfProductiveAssets / crnt_ValueOfProductiveAssetsAxis = crnt_Nis140Nis500Member
More than NIS 500 [Member]
Taxes On Income [Line Items]
New proportion that the required investment bears to the value of productive assets	5.00%crnt_NewProportionThatRequiredInvestmentBearsToValueOfProductiveAssets / crnt_ValueOfProductiveAssetsAxis = crnt_MoreThanNis500Member
Minimum [Member] | NIS 140 - NIS 500 [Member]
Taxes On Income [Line Items]
Value of productive assets before the expansion	140crnt_ValueOfProductiveAssetsBeforeExpansion / us-gaap_RangeAxis = us-gaap_MinimumMember / crnt_ValueOfProductiveAssetsAxis = crnt_Nis140Nis500Member
Minimum [Member] | More than NIS 500 [Member]
Taxes On Income [Line Items]
Value of productive assets before the expansion	500crnt_ValueOfProductiveAssetsBeforeExpansion / us-gaap_RangeAxis = us-gaap_MinimumMember / crnt_ValueOfProductiveAssetsAxis = crnt_MoreThanNis500Member
Maximum [Member] | Up to NIS 140 [Member]
Taxes On Income [Line Items]
Value of productive assets before the expansion	140crnt_ValueOfProductiveAssetsBeforeExpansion / us-gaap_RangeAxis = us-gaap_MaximumMember / crnt_ValueOfProductiveAssetsAxis = crnt_UpToNis140Member
Maximum [Member] | NIS 140 - NIS 500 [Member]
Taxes On Income [Line Items]
Value of productive assets before the expansion	500crnt_ValueOfProductiveAssetsBeforeExpansion / us-gaap_RangeAxis = us-gaap_MaximumMember / crnt_ValueOfProductiveAssetsAxis = crnt_Nis140Nis500Member

X

- Definition

New proportion that the required investment bears to the value of productive assets

+ References

No definition available.

+ Details

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X

- Details

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X

- Definition

Value of productive assets before the expansion

+ References

No definition available.

+ Details

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Namespace Prefix:	crnt_
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X

- Details

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X

- Details

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X

- Details

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X

- Details

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X

- Details

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