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SHAREHOLDERS' EQUITY (Summary of Restricted Stock Units Activity) (Details) - 12 months ended Dec. 31, 2017 - Restricted Stock Awards And Restricted Stock Units [Member]		$ / shares shares	₪ / shares
Number of RSU and RSA
Outstanding at January 1, 2017	[1]	1,498,643
Granted	[1]	654,315
Vested	[1]	(456,807)
Cancelled	[1]	(250)
Forfeited	[1]	(170,889)
Outstanding at December 31, 2017	[1]	1,525,012
Par value NIS | ₪ / shares			₪ 1
Par value USD | $ / shares		$ 0.29
[1] NIS 1 par value which represents approximately $0.29

X

- Definition

Par value of restricted stock, in NIS per share.

+ References

No definition available.

+ Details

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X

- Definition

Par value of restricted stock, in USD per share.

+ References

No definition available.

+ Details

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X

- Definition

Share based compensation arrangement by share based payment award options cancelled in period.

+ References

No definition available.

+ Details

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Namespace Prefix:	NICE_
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Balance Type:	na
Period Type:	duration

X

- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(1)(iv)(3)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(1)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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X

- Definition

A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

+ References

No definition available.

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- Definition

The number of equity-based payment instruments, excluding stock (or unit) options, that vested during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(iii)(2)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

+ Details

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