Acquisitions | Restructuring Activity (Details) $ in Thousands	3 Months Ended
	Apr. 30, 2018 USD ($)
Severance
Restructuring Activity
Balance at January 31, 2018	$ 13,366
Fiscal 2019 restructuring expenses	12,412
Cash payments	(5,747)
Foreign currency translation	(385)
Balance at April 30, 2018	19,646
Facility Closing and Other Costs
Restructuring Activity
Balance at January 31, 2018	1,630
Fiscal 2019 restructuring expenses	4,068
Cash payments	(1,620)
Foreign currency translation	(75)
Balance at April 30, 2018	4,003
Restructuring costs
Restructuring Activity
Balance at January 31, 2018	14,996
Fiscal 2019 restructuring expenses	16,480
Cash payments	(7,367)
Foreign currency translation	(460)
Balance at April 30, 2018	$ 23,649