INTANGIBLE ASSETS AND GOODWILL - INTANGIBLE ASSETS (Details) - USD ($) $ in Thousands	Jul. 31, 2016	Jan. 31, 2016
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	$ 635,240	$ 609,054
Finite-Lived Intangible Assets, Accumulated Amortization	(395,880)	(363,472)
Intangible assets with finite lives, Net	239,360	245,582
Finite and Indefinite-Lived Intangible Assets Gross	636,340	610,154
Intangible Assets, Net (Excluding Goodwill)	240,460	246,682
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	386,588	371,722
Finite-Lived Intangible Assets, Accumulated Amortization	(227,826)	(211,824)
Intangible assets with finite lives, Net	158,762	159,898
Acquired Technology
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	219,925	211,388
Finite-Lived Intangible Assets, Accumulated Amortization	(148,809)	(134,391)
Intangible assets with finite lives, Net	71,116	76,997
Trade Names
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	21,240	18,457
Finite-Lived Intangible Assets, Accumulated Amortization	(12,931)	(11,570)
Intangible assets with finite lives, Net	8,309	6,887
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	(2,318)	(2,137)
Intangible assets with finite lives, Net	729	910
Distribution Networks
Acquired Finite-Lived Intangible Assets [Line Items]
Finite-Lived Intangible Assets, Gross	4,440	4,440
Finite-Lived Intangible Assets, Accumulated Amortization	(3,996)	(3,550)
Intangible assets with finite lives, Net	$ 444	$ 890