Correction of Immaterial Errors (Effect of recording immaterial corrections in the condensed consolidated balance sheets and consolidated statements of comprehensive income (loss))(Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Oct. 31, 2014	Oct. 31, 2013	Oct. 31, 2014	Oct. 31, 2013	Jan. 31, 2014
Accrued pension expenses	$ 22,063	$ 25,192	$ 22,063	$ 25,192	$ 23,951
Total stockholder’s equity	34,797	34,387	34,797	34,387	27,605
Net income (loss)	4,632	3,408	5,980	5,171
Comprehensive income (loss)	4,953	4,610	6,943	7,177
As Previously Reported
Accrued pension expenses		26,398		26,398
Total stockholder’s equity		33,181		33,181
Net income (loss)		3,408
Comprehensive income (loss)		$ 4,208		$ 5,971