Consolidated Statements Of Operations (USD $) In Thousands, except Per Share data, unless otherwise specified	12 Months Ended
	Jul. 31, 2013		Jul. 31, 2012		Jul. 31, 2011
Net revenue:
Product	$ 526,725		$ 494,675		$ 447,622
Engineering	23,638		21,896		25,973
Total net revenue	550,363		516,571		473,595
Cost of sales:
Product	313,458		302,288		278,153
Engineering	20,226		21,099		22,479
Total cost of sales	333,684		323,387		300,632
Gross profit	216,679		193,184		172,963
Operating expenses:
Research and product development	63,990		57,230		63,125
Selling and marketing	51,268		44,238		41,413
General and administrative	52,527		51,753		40,623
Restructuring	3,519				7,066
Total operating expenses	171,304		153,221		152,227
Income from operations	45,375		39,963		20,736
Other income (expense):
Interest income, net	371		532		711
Gain on sale of other investments			2,500
Other, net	(1,649)		1,204		(515)
Total other (expense) income, net	(1,278)	[1]	4,236	[1]	196	[1]
Income from continuing operations before income taxes	44,097		44,199		20,932
Provision for income taxes	12,976		1,128		4,312
Income from continuing operations	31,121		43,071		16,620
Income from discontinued operations (net of income tax provision of $168 for fiscal year 2011)					289
Gain on disposal of discontinued operations (net of income tax provision of $505 for fiscal year 2011)					924
Net income	$ 31,121		$ 43,071		$ 17,833
Basic net income per common share:
Income from continuing operations	$ 2.54		$ 3.51		$ 1.33
Income from discontinued operations, net of tax					$ 0.02
Gain on disposal of discontinued operations, net of tax					$ 0.08
Basic net income per share	$ 2.54		$ 3.51		$ 1.43
Diluted net income per common share:
Income from continuing operations	$ 2.48		$ 3.42		$ 1.33
Income from discontinued operations, net of tax					$ 0.02
Gain on disposal of discontinued operations, net of tax					$ 0.07
Diluted net income per share	$ 2.48		$ 3.42		$ 1.42
Weighted average shares outstanding:
Basic	12,247		12,265		12,491
Diluted	12,569		12,576		12,572
Dividends declared and paid per share:	$ 0.40		$ 0.40		$ 0.40

[1] Includes a realized loss of $1,546 on foreign currency transactions in fiscal year 2013. Includes realized gain of $2,500 from the sale of our remaining interest in our China based affiliate received in fiscal year 2012. Includes net interest income of $371, $532, and $711 in fiscal years 2013, 2012, and 2011, respectively.