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SIGNIFICANT ACCOUNTING POLICIES (Schedule of Property and Equipment Depreciation Rates) (Details) | 12 Months Ended
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Dec. 31, 2017
Computers and Peripheral Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment depreciation rate | 20.00%
Computers and Peripheral Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment depreciation rate | 33.00%
Office Furniture and Equipment [Member] | Minimum [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment depreciation rate | 7.00%
Office Furniture and Equipment [Member] | Maximum [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment depreciation rate | 20.00%
Internal use software [Member] |
Property, Plant and Equipment [Line Items] |
Property and equipment depreciation rate | 33.00%

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- Definition Property and equipment depreciation rate + References No definition available. + Details
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Namespace Prefix: | NICE_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- 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
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |