Consolidated Statements of Operations (USD $)	12 Months Ended
	Jul. 31, 2013		Jul. 31, 2012		Jul. 31, 2011
Net sales	$ 319,797,000		$ 425,070,000		$ 612,379,000
Cost of sales	178,967,000		241,561,000		371,333,000
Gross profit	140,830,000		183,509,000		241,046,000
Expenses:
Selling, general and administrative	63,265,000		87,106,000		94,141,000
Research and development	36,748,000		38,489,000		43,516,000
Amortization of intangibles	6,328,000		6,637,000		8,091,000
Merger termination fee, net	0		0		(12,500,000)
Total operating expenses	106,341,000		132,232,000		133,248,000
Operating income	34,489,000		51,277,000		107,798,000
Other expenses (income):
Interest expense	8,163,000		8,832,000		8,415,000
Interest income and other	(1,167,000)		(1,595,000)		(2,421,000)
Income before provision for income taxes	27,493,000		44,040,000		101,804,000
Provision for income taxes	9,685,000		11,624,000		33,909,000
Net income	$ 17,808,000		$ 32,416,000		$ 67,895,000
Net income per share:
Basic	$ 1.05		$ 1.62		$ 2.53
Diluted	$ 0.97	[1]	$ 1.42	[1]	$ 2.22	[1]
Weighted average number of common shares outstanding - basic	16,963,000		19,995,000		26,842,000
Weighted average number of common and common equivalent shares outstanding - diluted	23,064,000		25,991,000		32,623,000
Dividends declared per issued and outstanding common share as of the applicable dividend record date	$ 1.10		$ 1.10		$ 1.00

[1] * Income per share information for the full fiscal year may not equal the total of the quarters within the year.