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Consolidated Statements of Income/(Loss) and Comprehensive Income/(Loss) (Unaudited) (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2012
Oct. 31, 2011
Oct. 31, 2012
Oct. 31, 2011
Consolidated Statements of Income and Comprehensive Income [Abstract]        
Net sales $ 136,560 $ 92,299 $ 272,555 $ 184,029
Cost of sales 88,037 67,693 172,739 132,907
Gross profit 48,523 24,606 99,816 51,122
Operating expenses:        
Research and development 1,278 1,241 2,420 2,579
Selling and marketing 8,042 8,636 14,870 16,761
General and administrative 12,579 11,295 24,604 22,817
Total operating expenses 21,899 21,172 41,894 42,157
Operating income from continuing operations 26,624 3,434 57,922 8,965
Other income/(expense):        
Other income/(expense), net 39 20 39 54
Interest income 335 399 703 802
Interest expense (1,344) (2,477) (3,331) (4,416)
Total other income/(expense), net (970) (2,058) (2,589) (3,560)
Income from continuing operations before income taxes 25,654 1,376 55,333 5,405
Income tax expense 9,253 428 20,061 2,182
Income from continuing operations 16,401 948 35,272 3,223
Discontinued operations (Note 3):        
Loss from operations of discontinued security solutions division (867) (4,004) (2,550) (6,706)
Income tax benefit (5,651) (1,465) (6,249) (2,681)
Income/(loss) from discontinued operations 4,784 (2,539) 3,699 (4,025)
Net income/(loss)/comprehensive income/(loss) $ 21,185 $ (1,591) $ 38,971 $ (802)
Net income/(loss) per share (Note 12):        
Basic-continuing operations $ 0.25 $ 0.01 $ 0.54 $ 0.05
Basic-net income/(loss) $ 0.32 $ (0.02) $ 0.59 $ (0.01)
Diluted-continuing operations $ 0.24 $ 0.01 $ 0.52 $ 0.05
Diluted-net income/(loss) $ 0.31 $ (0.02) $ 0.58 $ (0.01)
Weighted average number of common shares outstanding (Note 12):        
Basic 65,871 64,697 65,611 64,613
Diluted 67,274 65,110 66,914 65,130