Acquisitions | Acquisition & Integration Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Apr. 30, 2018	Apr. 30, 2017
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	$ 33,225	$ 42,066
Restructuring costs
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	16,480	10,345
IT related costs
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	7,330	1,770
Professional services
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	3,567	10,137
Transaction related costs
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	878	15,179
Other costs
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	4,970	4,635
Americas
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	13,900	30,200
Americas | Restructuring costs
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	4,300	10,000
Europe
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	18,000	11,600
Europe | Restructuring costs
Acquisition and integration expenses
Acquisition, integration and restructuring expenses	$ 12,200	$ 1,000