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Quarterly Results (Unaudited) (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
3 Months Ended 12 Months Ended
Jan. 31, 2014
Oct. 31, 2013
Jul. 31, 2013
Apr. 30, 2013
Jan. 31, 2013
Oct. 31, 2012
Jul. 31, 2012
Apr. 30, 2012
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2012
Quarterly Financial Information Disclosure [Abstract]                      
Net sales $ 19,643 $ 59,454 $ 56,933 $ 19,890 $ 18,154 $ 56,642 $ 60,392 $ 23,668 $ 155,920 $ 158,856 $ 166,441
Gross profit 4,276 21,161 21,586 6,409 2,400 19,318 22,867 6,967 53,432 51,552 48,158
Net income (loss) $ (6,901) $ 3,408 $ 6,210 $ (4,447) $ (8,958) $ 2,908 $ 7,053 $ (4,833) $ (1,730) $ (3,830) $ (13,803)
Per common share                      
Basic (dollar per share) $ (0.47) [1] $ 0.23 [1] $ 0.43 [1] $ (0.31) [1] $ (0.62) [1] $ 0.20 [1] $ 0.49 [1] $ (0.34) [1] $ (0.12) [1] $ (0.27) [1] $ (0.97) [1]
Assuming dilution (dollar per share) $ (0.47) [1] $ 0.23 [1] $ 0.42 [1] $ (0.31) [1] $ (0.62) [1] $ 0.20 [1] $ 0.49 [1] $ (0.34) [1] $ (0.12) [1] $ (0.27) [1] $ (0.97) [1]
[1] Net loss per share was calculated based on basic shares outstanding due to the anti-dilutive effect on the inclusion of common stock equivalent shares.