Acquisitions (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2015	Jul. 31, 2015	Jul. 31, 2014	Jun. 01, 2015
Business Acquisition [Line Items]
Business Combination, Consideration Transferred		$ 27,848	$ 0
STG [Member]
Business Acquisition [Line Items]
Business Combination, Consideration Transferred	$ 27,848
Finite-lived Intangible Assets Acquired				$ 349
Finite-lived Intangible Assets Acquired				14,500
Goodwill				14,117
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities				$ 1,118