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Condensed Consolidated Statements of Operations (USD $)
 3 Months Ended 6 Months Ended
Jan. 31, 2014
Jan. 31, 2013
Jan. 31, 2014
Jan. 31, 2013
Net sales $ 85,499,000 $ 74,577,000 $ 168,867,000 $ 165,530,000
Cost of sales 48,130,000 42,337,000 95,120,000 91,487,000
Gross profit 37,369,000 32,240,000 73,747,000 74,043,000
Expenses:        
Selling, general and administrative 16,349,000 15,433,000 32,547,000 32,243,000
Research and development 8,266,000 9,278,000 16,765,000 19,327,000
Amortization of intangibles 1,582,000 1,582,000 3,164,000 3,164,000
Total operating expenses 26,197,000 26,293,000 52,476,000 54,734,000
Operating income 11,172,000 5,947,000 21,271,000 19,309,000
Other expenses (income):        
Interest expense 1,998,000 2,030,000 4,016,000 4,141,000
Interest income and other (228,000) (315,000) (501,000) (591,000)
Income before provision for income taxes 9,402,000 4,232,000 17,756,000 15,759,000
Provision for income taxes 3,419,000 1,867,000 6,468,000 5,959,000
Net income $ 5,983,000 $ 2,365,000 $ 11,288,000 $ 9,800,000
Net income per share (See Note 5):        
Basic (in dollars per share) $ 0.37 $ 0.14 $ 0.70 $ 0.57
Diluted (in dollars per share) $ 0.32 $ 0.14 $ 0.60 $ 0.51
Weighted average number of common shares outstanding – basic (in shares) 15,970,000 17,300,000 16,212,000 17,340,000
Weighted average number of common and common equivalent shares outstanding – diluted (in shares) 22,487,000 17,401,000 22,552,000 23,394,000
Dividends declared per issued and outstanding common share as of the applicable dividend record date (in shares) $ 0.30 $ 0.275 $ 0.575 $ 0.55