Acquisition, Integration and Restructuring Expenses | Global Business Optimization Restructuring Activity (Details) - Global Business Optimization Program - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2019	Apr. 30, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring Charges	$ 6,221	$ 5,608
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	14,798
Restructuring Charges	4,147	3,269
Payments for Restructuring	5,188
Restructuring Reserve, Translation and Other Adjustment	(242)
Restructuring Reserve - Ending Balance	13,515
Professional services
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	631
Restructuring Charges	2,074	$ 2,339
Payments for Restructuring	1,725
Restructuring Reserve, Translation and Other Adjustment	(16)
Restructuring Reserve - Ending Balance	964
Restructuring Charges
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve - Beginning Balance	15,429
Restructuring Charges	6,221
Payments for Restructuring	6,913
Restructuring Reserve, Translation and Other Adjustment	(258)
Restructuring Reserve - Ending Balance	$ 14,479