BUSINESS COMBINATIONS BUSINESS COMBINATIONS - YEAR ENDED JANUARY 31, 2017 - PURCHASE PRICE ALLOCATIONS (Details) - USD ($) $ in Thousands	Nov. 16, 2016	Feb. 19, 2016	Jan. 31, 2018	Jan. 31, 2017	Jan. 31, 2016
Business Acquisition
Goodwill			$ 1,388,299	$ 1,264,818	$ 1,207,176
Customer Engagement
Business Acquisition
Goodwill			$ 1,251,093	$ 1,131,979	$ 1,075,206
Customer Engagement | Contact Solutions, LLC
Business Acquisition
Payment Made At Closing To Acquire Businesses		$ 66,915
Fair value of contingent obligation		0
Post-closing purchase price adjustment		2,518
Business Combination, Consideration Transferred		69,433
Accounts receivable		8,102
Other current assets, including cash acquired		2,392
Property and equipment, net		7,007
Other assets		1,904
Current and other liabilities		(4,943)
Deferred Revenue - Current and Long-Term		642
Deferred Income Taxes		0
Net Tangible Assets (Liabilities)		13,820
Identifiable intangible assets		33,500
Goodwill		22,113
Total Purchase Price Allocations		69,433
Customer Engagement | OpinionLab Inc.
Business Acquisition
Payment Made At Closing To Acquire Businesses	$ 56,355
Fair value of contingent obligation	15,000
Post-closing purchase price adjustment	0
Business Combination, Consideration Transferred	71,355
Accounts receivable	748
Other current assets, including cash acquired	10,625
Property and equipment, net	298
Other assets	2,036
Current and other liabilities	(1,600)
Deferred Revenue - Current and Long-Term	3,082
Deferred Income Taxes	(9,877)
Net Tangible Assets (Liabilities)	(852)
Identifiable intangible assets	31,300
Goodwill	40,907
Total Purchase Price Allocations	71,355
Customer Relationships | Customer Engagement | Contact Solutions, LLC
Business Acquisition
Identifiable intangible assets		18,000
Customer Relationships | Customer Engagement | OpinionLab Inc.
Business Acquisition
Identifiable intangible assets	19,100
Acquired Technology | Customer Engagement | Contact Solutions, LLC
Business Acquisition
Identifiable intangible assets		13,100
Acquired Technology | Customer Engagement | OpinionLab Inc.
Business Acquisition
Identifiable intangible assets	10,400
Trademarks and Trade Names | Customer Engagement | Contact Solutions, LLC
Business Acquisition
Identifiable intangible assets		$ 2,400
Trademarks and Trade Names | Customer Engagement | OpinionLab Inc.
Business Acquisition
Identifiable intangible assets	$ 1,800