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Financial Summary by Quarter - Unaudited - Schedule of Financial Summary by Quarter (Detail) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 12 Months Ended
May. 31, 2015
Feb. 28, 2015
Nov. 30, 2014
Aug. 31, 2014
May. 31, 2014
Feb. 28, 2014
Nov. 30, 2013
Aug. 31, 2013
May. 31, 2015
May. 31, 2014
Quarterly Financial Information Disclosure [Abstract]                    
Net sales $ 49,605 $ 38,109 $ 49,667 $ 49,604 $ 46,040 $ 30,169 $ 39,208 $ 37,663 $ 186,985 $ 153,080
Gross profit (loss) 5,557 2,338 5,158 4,041 2,880 779 3,807 3,603 17,094 11,069
(Loss) income from continuing operations (149) (2,911) 81 (1,209) (1,672) (3,906) (739) (990) (4,188) (7,307)
Loss from discontinued operations, net of taxes (51) (86) (3,525) (2,564) (888) (1,806) (1,474) (389) (6,226) (4,557)
Net (loss) income $ (200) $ (2,997) $ (3,444) $ (3,773) $ (2,560) $ (5,712) $ (2,213) $ (1,379) $ (10,414) $ (11,864)
Basic (loss) income per share $ (0.02) $ (0.36) $ (0.41) $ (0.45) $ (0.30) $ (0.68) $ (0.27) $ (0.16) $ (1.24) $ (1.41)