Segment Information and Significant Customers (Tables)

12 Months Ended

Jul. 31, 2011

Segment Information and Significant Customers [Abstract]

Schedule of total revenue by geographic region

	Years Ended July 31,
	2011		2010		2009
	(In thousands)
United States	$	250,995	$	166,584	$	129,991
Europe, Middle East and Africa		62,595		38,140		34,178
Asia Pacific		70,171		51,110		27,023
Rest of World		12,753		10,700		8,067
Total	$	396,514	$	266,534	$	199,259

Significant channel partners as a percentage of total revenues

	Years Ended July 31,
	2011			2010			2009
ScanSource, Inc. (Catalyst)		19.4	%		17.1	%		*
Avnet Logistics U.S. LP		17.1	%		16.6	%		10.1	%
Alcatel-Lucent		13.9	%		10.4	%		14.5	%

Significant channel partners as a percentage of total accounts receivable

	As of July 31,
	2011			2010
ScanSource, Inc. (Catalyst)		*			31.6	%
Avnet Logistics U.S. LP		23.8	%		18.2	%
Alcatel-Lucent		18.4	%		*