Acquisitions | Restructuring Activity (Details) $ in Thousands	9 Months Ended
	Oct. 31, 2017 USD ($)
Severance
Restructuring Activity
Fiscal 2018 restructuring expenses	$ 18,687
Cash payments	(11,270)
Foreign currency translation	49
Balance at October 31, 2017	7,466
Facility Exit Costs
Restructuring Activity
Fiscal 2018 restructuring expenses	5,501
Cash payments	(2,489)
Foreign currency translation	29
Balance at October 31, 2017	3,041
Restructuring costs
Restructuring Activity
Fiscal 2018 restructuring expenses	24,188
Cash payments	(13,759)
Foreign currency translation	78
Balance at October 31, 2017	$ 10,507