Commitments and Contingencies (Tables)

12 Months Ended

Jul. 31, 2011

Commitments and Contingencies [Abstract]

Future minimum lease payments under non-cancelable operating leases

	Operating
	Leases
	(In thousands)
Year ending July 31,
2012	$	4,823
2013		4,414
2014		3,969
2015		3,892
2016		3,336
Total minimum payments	$	20,434

Changes in the warranty liability

	Warranty
	Amount
	(In thousands)
As of July 31, 2008	$	125
Provision		256
Obligations fulfilled during period		(223	)
As of July 31, 2009		158
Provision		266
Obligations fulfilled during period		(214	)
As of July 31, 2010		210
Provision		462
Obligations fulfilled during period		(268	)
As of July 31, 2011	$	404