Acquisition, Integration and Restructuring Expenses | Global Business Optimization Program (Details) - Global Business Optimization Program $ in Thousands	3 Months Ended	6 Months Ended
	Jul. 31, 2018 USD ($)	Jul. 31, 2018 USD ($)
Restructuring Cost and Reserve
Restructuring Charges	$ 12,735	$ 18,343
Restructuring Charges
Restructuring Cost and Reserve
Restructuring Charges		18,343
Employee Severance
Restructuring Cost and Reserve
Restructuring Charges	5,605	8,874
Professional services
Restructuring Cost and Reserve
Restructuring Charges	7,130	9,469
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	6,100	10,900
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	6,500	7,300
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	$ 100	$ 100