INTANGIBLE ASSETS AND GOODWILL - INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Jul. 31, 2017	Jan. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 685,480	$ 668,619
Finite-Lived Intangible Assets, Accumulated Amortization	(476,684)	(434,460)
Intangible assets with finite lives, Net	208,796	234,159
Finite and Indefinite-Lived Intangible Assets Gross	686,580	669,719
Intangible Assets, Net (Excluding Goodwill)	209,896	235,259
In Process Research and Development
Acquired Finite-Lived Intangible Assets [Line Items]
Indefinite-Lived Intangible Assets (Excluding Goodwill)	1,100	1,100
Customer Relationships
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	416,129	403,657
Finite-Lived Intangible Assets, Accumulated Amortization	(266,010)	(244,792)
Intangible assets with finite lives, Net	150,119	158,865
Acquired Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	237,065	233,982
Finite-Lived Intangible Assets, Accumulated Amortization	(187,322)	(168,653)
Intangible assets with finite lives, Net	49,743	65,329
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	24,799	23,493
Finite-Lived Intangible Assets, Accumulated Amortization	(16,232)	(14,187)
Intangible assets with finite lives, Net	8,567	9,306
Non-competition Agreements
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	3,047	3,047
Finite-Lived Intangible Assets, Accumulated Amortization	(2,680)	(2,499)
Intangible assets with finite lives, Net	367	548
Distribution Network
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,440	4,440
Finite-Lived Intangible Assets, Accumulated Amortization	(4,440)	(4,329)
Intangible assets with finite lives, Net	$ 0	$ 111