Acquisitions (TS Acquisition) (Details) - USD ($) $ in Thousands	3 Months Ended			12 Months Ended
	Jan. 31, 2017	Oct. 31, 2016	Jul. 31, 2016	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Acquisition and integration expenses [Line Items]
Business Combination, Acquisition Related Costs	$ 14,000	$ 13,000	$ 2,000	$ 28,966	$ 0	$ 0
Other Expense [Member] | TS
Acquisition and integration expenses [Line Items]
Business Combination, Acquisition Related Costs				2,545
Professional Services [Member] | TS
Acquisition and integration expenses [Line Items]
Business Combination, Acquisition Related Costs				14,338
Transaction Related Costs [Member] | TS
Acquisition and integration expenses [Line Items]
Business Combination, Acquisition Related Costs				$ 12,083