Condensed Consolidated Statements of Operations (USD $)	3 Months Ended		6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011	Jan. 31, 2012	Jan. 31, 2011
Condensed Consolidated Statements of Operations
Net sales	$ 99,141,000	$ 162,811,000	$ 212,502,000	$ 340,971,000
Cost of sales	57,725,000	101,901,000	119,806,000	215,827,000
Gross profit	41,416,000	60,910,000	92,696,000	125,144,000
Expenses:
Selling, general and administrative	19,626,000	23,175,000	43,744,000	47,190,000
Research and development	9,444,000	10,467,000	19,128,000	21,218,000
Amortization of intangibles	1,692,000	2,004,000	3,411,000	3,891,000
Merger termination fee, net	0	0	0	(12,500,000)
Total operating expenses	30,762,000	35,646,000	66,283,000	59,799,000
Operating income	10,654,000	25,264,000	26,413,000	65,345,000
Other expenses (income):
Interest expense	2,183,000	2,090,000	4,329,000	4,153,000
Interest income and other	(434,000)	(626,000)	(930,000)	(1,320,000)
Income before provision for income taxes	8,905,000	23,800,000	23,014,000	62,512,000
Provision for income taxes	3,084,000	7,704,000	4,592,000	20,760,000
Net income	$ 5,821,000	$ 16,096,000	$ 18,422,000	$ 41,752,000
Net income per share:
Basic	$ 0.29	$ 0.59	$ 0.85	$ 1.51
Diluted	$ 0.27	$ 0.52	$ 0.75	$ 1.32
Weighted average number of common shares outstanding - basic	20,087,000	27,209,000	21,672,000	27,664,000
Weighted average number of common and common equivalent shares outstanding - diluted	26,056,000	32,983,000	27,588,000	33,403,000
Dividends declared per issued and outstanding common share as of the applicable dividend record date	$ 0.275	$ 0.25	$ 0.55	$ 0.5