The net result for the period of deducting operating expenses from operating revenues.

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- Definition

Amount of revenue recognized from goods sold, services rendered, insurance premiums, or other activities that constitute an earning process. Includes, but is not limited to, investment and interest income before deduction of interest expense when recognized as a component of revenue, and sales and trading gain (loss).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.1)
-URI http://asc.fasb.org/extlink&oid=63488584&loc=d3e20235-122688

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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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- Definition

Represents segment revenue adjustments related to deferred revenue of acquired companies.

+ References

No definition available.

+ Details

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SEGMENT, GEOGRAPHIC, AND SIGNIFICANT CUSTOMER INFORMATION - SEGMENT REVENUE AND SEGMENT CONTRIBUTION (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Jan. 31, 2018	Oct. 31, 2017	Jul. 31, 2017	Apr. 30, 2017	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Apr. 30, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Segment Reporting Information [Line Items]
Revenues	$ 318,731	$ 280,726	$ 274,777	$ 260,995	$ 295,859	$ 258,902	$ 261,921	$ 245,424	$ 1,135,229	$ 1,062,106	$ 1,130,266
Operating Income (Loss)									48,630	17,366	67,852
Customer Engagement
Segment Reporting Information [Line Items]
Revenues									740,067	705,897	694,857
Cyber Intelligence
Segment Reporting Information [Line Items]
Revenues									395,162	356,209	435,409
Reconciling items \| Customer Engagement
Segment Reporting Information [Line Items]
Segment Revenue Adjustments									(14,971)	(10,266)	(3,441)
Reconciling items \| Cyber Intelligence
Segment Reporting Information [Line Items]
Segment Revenue Adjustments									(258)	(324)	(934)
Segment Amount \| Customer Engagement
Segment Reporting Information [Line Items]
Revenues									755,038	716,163	698,298
Operating Income (Loss)									286,236	269,017	264,378
Segment Amount \| Cyber Intelligence
Segment Reporting Information [Line Items]
Revenues									395,420	356,533	436,343
Operating Income (Loss)									$ 94,585	$ 85,777	$ 133,186