Restatement of the Unaudited Consolidated Financial Statements (Restatement of Shareholders' Equity) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Oct. 31, 2015	Oct. 31, 2014	Oct. 31, 2015	Oct. 31, 2014	Jan. 31, 2015	Jan. 31, 2014
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ (6,166)	$ 6,797	$ 2,916	$ 25,578
Income tax impact related to share-based compensation			(690)	91
Total shareholders' equity	267,606	$ 266,955	267,606	$ 266,955	$ 305,237	$ 251,462
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(1,559)		7,523
Income tax impact related to share-based compensation			(267)
Total shareholders' equity	272,636		272,636
Restatement Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(4,607)		(4,607)
Income tax impact related to share-based compensation			(423)
Total shareholders' equity	$ (5,030)		$ (5,030)