Condensed Consolidated Statements of Comprehensive Income Unaudited - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jul. 31, 2016	Jul. 31, 2015	Jul. 31, 2016	Jul. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 6,886	$ 7,450	$ 3,747	$ 4,274
Other comprehensive income (loss) :
Pension adjustments	330	495	660	990
Comprehensive income (loss)	$ 7,216	$ 7,945	$ 4,407	$ 5,264