Condensed Consolidated Statements of Operations (USD $)	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Condensed Consolidated Statements of Operations
Net sales	$ 113,361,000	$ 178,160,000
Cost of sales	62,081,000	113,926,000
Gross profit	51,280,000	64,234,000
Expenses:
Selling, general and administrative	24,118,000	24,015,000
Research and development	9,684,000	10,751,000
Amortization of intangibles	1,719,000	1,887,000
Merger termination fee, net	0	(12,500,000)
Total operating expenses	35,521,000	24,153,000
Operating income	15,759,000	40,081,000
Other expenses (income):
Interest expense	2,146,000	2,063,000
Interest income and other	(496,000)	(694,000)
Income before provision for income taxes	14,109,000	38,712,000
Provision for income taxes	1,508,000	13,056,000
Net income	$ 12,601,000	$ 25,656,000
Net income per share:
Basic	$ 0.54	$ 0.91
Diluted	$ 0.47	$ 0.79
Weighted average number of common shares outstanding - basic	23,257,000	28,119,000
Weighted average number of common and common equivalent shares outstanding - diluted	29,147,000	33,771,000
Dividends declared per issued and outstanding common share as of the applicable dividend record date	$ 0.275	$ 0.25