Warranties (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014
Movement in Standard Product Warranty Accrual [Roll Forward]
Beginning balance	$ 3,120	$ 2,525	$ 1,888
Acquired	0	50	0
Accrual for warranties	1,945	3,467	4,561
Settlements made	(3,230)	(2,922)	(3,924)
Ending balance	$ 1,835	$ 3,120	$ 2,525