BUSINESS COMBINATIONS BUSINESS COMBINATIONS - YEAR ENDED JANUARY 31, 2016 (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended		12 Months Ended
	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015	Jan. 31, 2016
Business Acquisition [Line Items]
Goodwill		$ 1,218,699		$ 1,207,176
Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Cash Paid at Closing				49,500
Cash Paid at Closing				33,222
Business Acquisition Contingent Consideration Fair Value Disclosure				30,500
Business Combination, Consideration Transferred, Liabilities Incurred		7,700		16,237
Goodwill				28,717
Goodwill - tax deductible				5,100
Goodwill - not tax deductible				23,600
Transaction and Related Costs, Including Integration Costs	$ 300		$ 800
Enterprise Intelligence
Business Acquisition [Line Items]
Goodwill		1,059,333		1,048,955
Enterprise Intelligence | Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Goodwill				7,700
Cyber Intelligence
Business Acquisition [Line Items]
Goodwill		$ 121,468		120,719
Cyber Intelligence | Individually Immaterial Business Acquisitions
Business Acquisition [Line Items]
Goodwill				$ 21,000