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Consolidated Statements of Income and Comprehensive Income (USD $)
In Thousands, except Per Share data, unless otherwise specified
 3 Months Ended 6 Months Ended
Oct. 31, 2013
Oct. 31, 2012
Oct. 31, 2013
Oct. 31, 2012
Net sales $ 139,294 $ 136,560 $ 310,314 $ 272,555
Cost of sales 81,357 88,092 179,604 172,861
Gross profit 57,937 48,468 130,710 99,694
Operating expenses:        
Research and development 1,305 1,268 2,664 2,439
Selling and marketing 7,681 8,077 15,229 14,916
General and administrative 20,177 12,499 36,029 24,417
Total operating expenses 29,163 21,844 53,922 41,772
Operating income from continuing operations 28,774 26,624 76,788 57,922
Other income/(expense):        
Other income/(expense), net 36 39 41 39
Interest income 8 335 110 703
Interest expense (2,046) (1,344) (8,719) (3,331)
Total other income/(expense), net (2,002) (970) (8,568) (2,589)
Income from continuing operations before income taxes 26,772 25,654 68,220 55,333
Income tax expense 9,627 9,253 24,549 20,061
Income from continuing operations 17,145 16,401 43,671 35,272
Discontinued operations:        
Loss from operations of discontinued security solutions division (222) (867) (274) (2,550)
Income tax benefit (64) (5,651) (66) (6,249)
Income/(loss) from discontinued operations (158) 4,784 (208) 3,699
Net income/comprehensive income $ 16,987 $ 21,185 $ 43,463 $ 38,971
Net income per share (Note 11):        
Basic - continuing operations $ 0.29 [1] $ 0.25 [1] $ 0.71 [1] $ 0.54 [1]
Basic - net income $ 0.28 [1] $ 0.32 [1] $ 0.70 [1] $ 0.59 [1]
Diluted - continuing operations $ 0.28 [1] $ 0.24 [1] $ 0.69 [1] $ 0.53 [1]
Diluted - net income $ 0.28 [1] $ 0.31 [1] $ 0.68 [1] $ 0.58 [1]
Weighted average number of common shares outstanding (Note 11):        
Basic 59,620 65,871 61,931 65,611
Diluted 60,984 67,274 63,751 66,914
[1] Net income per share may not equal earnings per share from continuing plus discontinued operations due to rounding.