Acquisition, Integration and Restructuring Expenses | Global Business Optimization Program (Details) - Global Business Optimization Program $ in Thousands	3 Months Ended	9 Months Ended
	Oct. 31, 2018 USD ($)	Oct. 31, 2018 USD ($)
Restructuring Cost and Reserve
Restructuring Charges	$ 13,124	$ 31,467
Restructuring Charges
Restructuring Cost and Reserve
Restructuring Charges		31,467
Employee Severance
Restructuring Cost and Reserve
Restructuring Charges	8,741	17,615
Professional services
Restructuring Cost and Reserve
Restructuring Charges	4,383	13,852
Minimum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	70,000	70,000
Maximum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	80,000	80,000
Europe
Restructuring Cost and Reserve
Restructuring Charges	10,100	21,000
Europe | Minimum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	40,000	40,000
Europe | Maximum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	45,000	45,000
Americas
Restructuring Cost and Reserve
Restructuring Charges	2,500	9,800
Americas | Minimum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	30,000	30,000
Americas | Maximum
Restructuring Cost and Reserve
Restructuring and Related Cost, Expected Cost	35,000	35,000
Asia-Pacific
Restructuring Cost and Reserve
Restructuring Charges	$ 500	$ 700