Other Income (Expense), Net Other Income (Expense), Net (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Other Income and Expenses [Abstract]
Interest income	$ 1,870	$ 1,723	$ 2,360
Foreign currency exchange gain (loss)	199	(1,152)	(1,872)
Other, net	(457)	(1,348)	(1,008)
Other income (expense), net	$ 1,612	$ (777)	$ (520)