Condensed Consolidated Statements of Comprehensive Income (Loss) Unaudited - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2015	Jul. 31, 2014
Statement of Comprehensive Income [Abstract]
Net income (loss)	$ 7,450	$ 5,203	$ 4,274	$ 1,348
Other comprehensive income (loss) :
Pension adjustments	495	321	990	642
Comprehensive income (loss)	$ 7,945	$ 5,524	$ 5,264	$ 1,990