Fair Value Measurements (Tables)

12 Months Ended

Jul. 31, 2011

Fair Value Measurements

Summary Of Cash Equivalents Measured At Fair Value

	Fair Value Measurement as of July 31, 2011
Description	Balance at July 31, 2011		Level 1		Level 2		Level 3
US Treasury	$	8,381	$	8,381	$	--	$	--
Certificates of Deposit	$	2,490	$	--	$	2,490	$	--
	Fair Value Measurement as of July 31, 2010
Description	Balance at July 31, 2010		Level 1		Level 2		Level 3
Money Market	$	399	$	399	$	--	$	--
US Treasury	$	8,297	$	8,297	$	--	$	--
Certificates of Deposit	$	300	$	--	$	300	$	--