Restatement of the Consolidated Financial Statements (Statements of Shareholders' Equity) (Details) - USD ($) $ in Thousands	12 Months Ended
	Jan. 31, 2016	Jan. 31, 2015	Jan. 31, 2014	Jan. 31, 2013
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	$ 4,848	$ 31,796	$ 42,902
Income tax impact related to share-based compensation	(1,231)	100	299
Total shareholders' equity	264,229	$ 305,237	$ 251,462	$ 221,447
As Previously Reported [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	8,561
Income tax impact related to share-based compensation	(308)
Total shareholders' equity	268,865
Restatement Adjustments [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Net income	(3,713)
Income tax impact related to share-based compensation	(923)
Total shareholders' equity	$ (4,636)