BUSINESS COMBINATIONS BUSINESS COMBINATIONS - YEAR ENDED JANUARY 31, 2017 - INTANGIBLE ASSETS USEFUL LIVES (Details)			12 Months Ended
	Nov. 16, 2016	Feb. 19, 2016	Jan. 31, 2017	Jan. 31, 2015
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)			10 years
Weighted-average estimated useful life of all finite-lived identifiable intangible assets (in years)			7 years 9 months 17 days	7 years 5 months
Customer Engagement | Contact Solutions, LLC
Business Acquisition
Weighted-average estimated useful life of all finite-lived identifiable intangible assets (in years)		7 years 3 months 20 days
Customer Engagement | OpinionLab Inc.
Business Acquisition
Weighted-average estimated useful life of all finite-lived identifiable intangible assets (in years)	8 years 3 months 20 days
Customer Relationships | Customer Engagement | Contact Solutions, LLC
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)		10 years
Customer Relationships | Customer Engagement | OpinionLab Inc.
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)	10 years
Acquired Technology | Customer Engagement | Contact Solutions, LLC
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)		4 years
Acquired Technology | Customer Engagement | OpinionLab Inc.
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)	6 years
Trademarks and Trade Names | Customer Engagement | Contact Solutions, LLC
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)		5 years
Trademarks and Trade Names | Customer Engagement | OpinionLab Inc.
Business Acquisition
Estimated useful lives of finite-lived intangible assets (in years)	4 years