Subsequent Events (Details) (USD $)	3 Months Ended
	Apr. 30, 2015	Apr. 30, 2014	Jul. 31, 2015	Jun. 03, 2015
Subsequent Event
Gain (Loss) Related to Litigation Settlement	$ 38,511,000	$ 0
STG
Subsequent Event
Business Combination, Consideration Transferred			27,000,000
LCD Settlement
Subsequent Event
Gain (Loss) Related to Litigation Settlement			22,600,000
Share Repurchase Program [Member]
Subsequent Event
Stock Repurchase Program, Authorized Amount				$ 100,000,000