INTANGIBLE ASSETS AND GOODWILL - INTANGIBLE ASSETS (Details) (USD $) In Thousands, unless otherwise specified	Oct. 31, 2014	Jan. 31, 2014
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	$ 616,338	$ 368,287
Intangible assets with finite lives, Accumulated Amortization	(281,741)	(237,140)
Intangible assets with finite lives, Net	334,597	131,147
Total intangible assets, cost	618,038	369,987
Total intangible assets, net	336,297	132,847
In-process research and development, with indefinite lives
Acquisition-related intangible assets
Intangible assets with indefinite lives, cost	1,700	1,700
Customer Relationships
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	388,008	240,208
Intangible assets with finite lives, Accumulated Amortization	(169,745)	(141,714)
Intangible assets with finite lives, Net	218,263	98,494
Acquired Technology
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	200,078	106,361
Intangible assets with finite lives, Accumulated Amortization	(98,097)	(76,922)
Intangible assets with finite lives, Net	101,981	29,439
Trade Names
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	19,801	13,378
Intangible assets with finite lives, Accumulated Amortization	(9,007)	(11,378)
Intangible assets with finite lives, Net	10,794	2,000
Non-competition Agreements
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	3,625	5,514
Intangible assets with finite lives, Accumulated Amortization	(2,149)	(4,970)
Intangible assets with finite lives, Net	1,476	544
Distribution Network
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	4,440	2,440
Intangible assets with finite lives, Accumulated Amortization	(2,416)	(1,840)
Intangible assets with finite lives, Net	2,024	600
Backlog
Acquisition-related intangible assets
Intangible assets with finite lives, Cost	386	386
Intangible assets with finite lives, Accumulated Amortization	(327)	(316)
Intangible assets with finite lives, Net	$ 59	$ 70