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COMMITMENTS AND CONTINGENT LIABILITIES (Other Commitments) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016
Agreements With Suppliers To Purchase Licenses And Hosting Services [Member] |  |
Purchase Commitment, Excluding Long-term Commitment [Line Items] |  |
Non-cancelable obligations | $ 30,831 | $ 22,207

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- Definition The minimum amount the entity agreed to spend under the long-term purchase commitment. + References No definition available. + Details
Name: | us-gaap_LongTermPurchaseCommitmentAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
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
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_PurchaseCommitmentExcludingLongtermCommitmentAxis=NICE_AgreementsWithSuppliersToPurchaseLicensesAndHostingServicesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |