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Condensed Consolidated Statements of Operations (USD $)
 3 Months Ended 9 Months Ended
Apr. 30, 2012
Apr. 30, 2011
Apr. 30, 2012
Apr. 30, 2011
Condensed Consolidated Statements of Operations        
Net sales $ 99,793,000 $ 131,081,000 $ 312,295,000 $ 472,052,000
Cost of sales 58,115,000 74,110,000 177,921,000 289,937,000
Gross profit 41,678,000 56,971,000 134,374,000 182,115,000
Expenses:        
Selling, general and administrative 20,005,000 22,552,000 63,749,000 69,742,000
Research and development 9,481,000 10,328,000 28,609,000 31,546,000
Amortization of intangibles 1,626,000 2,173,000 5,037,000 6,064,000
Merger termination fee, net 0 0 0 (12,500,000)
Total operating expenses 31,112,000 35,053,000 97,395,000 94,852,000
Operating income 10,566,000 21,918,000 36,979,000 87,263,000
Other expenses (income):        
Interest expense 2,192,000 2,135,000 6,521,000 6,288,000
Interest income and other (370,000) (557,000) (1,300,000) (1,877,000)
Income before provision for income taxes 8,744,000 20,340,000 31,758,000 82,852,000
Provision for income taxes 2,678,000 6,085,000 7,270,000 26,845,000
Net income $ 6,066,000 $ 14,255,000 $ 24,488,000 $ 56,007,000
Net income per share:        
Basic $ 0.32 $ 0.54 $ 1.18 $ 2.05
Diluted $ 0.29 $ 0.47 $ 1.04 $ 1.79
Weighted average number of common shares outstanding - basic 18,853,000 26,577,000 20,746,000 27,310,000
Weighted average number of common and common equivalent shares outstanding - diluted 24,910,000 32,378,000 26,724,000 33,069,000
Dividends declared per issued and outstanding common share as of the applicable dividend record date $ 0.275 $ 0.25 $ 0.825 $ 0.75