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GOODWILL (Narrative) (Details) - USD ($)
$ in Thousands

12 Months Ended

Nov. 14, 2016

Dec. 31, 2017

Dec. 31, 2016

^[2]

Goodwill from acquisitions

$ 24,346

^[1]

$ 651,892

inContact [Member]

Goodwill from acquisitions

$ 559,372

559,372

Adjusted goodwill

$ 3,799

[1]	Includes a reduction of $3,799 of goodwill in respect of 2016 acquisition resulted from a finalization of purchase price allocation.
[2]	including a goodwill balance of $559,372 related to the acquisition of inContact.

X

- Definition

Amount of increase in asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized resulting from a business combination.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

Amount of increase (decrease), classified as other, of an asset representing the future economic benefits from other assets acquired in a business combination that are not individually identified and separately recognized.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 350
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=35741047&loc=d3e13816-109267

+ Details

Name:	us-gaap_GoodwillOtherIncreaseDecrease
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Details

Name:	us-gaap_BusinessAcquisitionAxis=NICE_InContactMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: