Fair Value Measurements (Tables)

12 Months Ended

Jul. 31, 2012

Assets and Liabilities of the Company Measured at Fair Value on a Recurring

Assets and liabilities of the Company measured at fair value on a recurring basis as of July 31, 2012, are summarized as follows (in thousands):

			Fair Value Measurements at Reporting Date Using
Description	July 31, 2012		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant  Unobservable Inputs (Level 3)
Assets
Cash Equivalents	$	136,654	$	136,654	$	—	$	—
Government Obligations		302,739		302,739		—		—
Total assets	$	439,393	$	439,393	$	—	$	—

Assets and liabilities of the Company measured at fair value on a recurring basis as of July 31, 2011, are summarized as follows (in thousands):

			Fair Value Measurements at Reporting Date Using
Description	July 31, 2011		Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant  Unobservable Inputs (Level 3)
Assets
Cash Equivalents	$	60,765	$	60,765	$	—	$	—
Corporate Obligations		26,856		26,856		—		—
Government Obligations		353,777		353,777		—		—
Total assets	$	441,398	$	441,398	$	—	$	—