Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2017	Jan. 31, 2016	Jan. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 22,760	$ 4,549	$ 849
Other comprehensive income (loss)
Pension adjustments (net of tax $1,816, $0, $0 in 2017, 2016 and 2015)	2,936	5,904	(6,254)
Comprehensive income (loss)	$ 25,696	$ 10,453	$ (5,405)