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Financial Summary by Quarter (Details) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 12 Months Ended
May 31, 2013
Feb. 28, 2013
Nov. 30, 2012
Aug. 31, 2012
May 31, 2012
Feb. 29, 2012
Nov. 30, 2011
Aug. 31, 2011
May 31, 2013
May 31, 2012
Schedule of Financial Summary by Quarter                    
Net sales $ 48,832 $ 36,986 $ 41,836 $ 49,920 $ 50,461 $ 36,805 $ 45,296 $ 50,284 $ 177,574 $ 182,846
Gross profit 5,259 471 2,674 3,059 3,267 (692) 1,265 1,044 11,463 4,884
Net (loss) income $ 45 $ (5,365) $ (1,725) $ (3,468) $ (1,711) $ (7,387) $ (3,422) $ (6,845) $ (10,513) $ (19,365)
Basic (loss) income per share $ 0.01 $ (0.64) $ (0.21) $ (0.41) $ (0.21) $ (0.88) $ (0.40) $ (0.82) $ (1.25) $ (2.31)