Acquisitions (Expenses)(Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2016	Oct. 31, 2015	Oct. 31, 2016	Oct. 31, 2015
Acquisition and integration expenses
Acquisition-related financing expenses	$ 3,400		$ 3,400
Acquisition and integration expenses	13,015	$ 0	14,997	$ 0
Transaction Related Costs | TS
Acquisition and integration expenses
Acquisition and integration expenses	8,535		9,190
Professional Services | TS
Acquisition and integration expenses
Acquisition and integration expenses	3,978		5,305
Other Expense | TS
Acquisition and integration expenses
Acquisition and integration expenses	$ 502		$ 502