Cash, Cash Equivalents and Marketable Securities (Tables)

12 Months Ended

Jul. 31, 2011

Cash and Cash Equivalents [Abstract]

Cash, Cash Equivalents as of July 31, 2011 and July 31, 2010

	Cost		Unrealized Gains		Unrealized Losses Less Than 12 Months		Unrealized Losses 12 Months or Longer		Estimated Fair Value
Cash	$	42,664	$	—	$	—	$	—	$	42,664
Money market funds		31,345		—		—		—		31,345
Total	$	74,009	$	—	$	—	$	—	$	74,009

 

As of July 31, 2010, cash and cash equivalents include the following (in thousands):

	Cost		Unrealized Gains		Unrealized Losses Less Than 12 Months		Unrealized Losses 12 Months or Longer		Estimated Fair Value
Cash	$	131,070	$	—	$	—	$	—	$	131,070
Money market funds		107,118		—		—		—		107,118
Cash equivalents—US Treasury Bills		30,000		—		—		—		30,000
Total	$	268,188	$	—	$	—	$	—	$	268,188