Fair Value Measurements (Tables)

6 Months Ended

Jan. 31, 2013

Financial Assets and Liabilities Measured at Fair Value Related Valuation Inputs

The following table presents financial assets and liabilities measured at fair value and their related valuation inputs as of January 31, 2013 and as of July 31, 2012:

			Fair Value Measurements at Reporting Date Using (in thousands)
January 31, 2013	Total Fair Value of  Asset or Liability		Quoted Prices in  Active Markets for Identical Assets (Level 1)		Significant Other Observable  Inputs (Level 2)		Significant Unobservable  Inputs (Level 3)
Cash and cash equivalents (1)	$	32,358	$	32,358	$	—	$	—
Marketable securities (2)		89,528		9,335		80,193		—
Total assets	$	121,886	$	41,693	$	80,193	$	—

July 31, 2012	Total Fair Value of  Asset or Liability		Quoted Prices in  Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable  Inputs (Level 3)
Cash and cash equivalents (1)	$	29,446	$	29,081	$	365	$	—
Marketable securities (2)		104,932		7,226		97,706		—
Total assets	$	134,378	$	36,307	$	98,071	$	—

(1) Cash and cash equivalents as of January 31, 2013 and July 31, 2012 includes cash held in operating accounts of approximately $29.4 million and $28.6 million, respectively, that are not subject to fair value measurements. For purposes of this disclosure they are included as having Level 1 inputs.

(2) Marketable securities as of January 31, 2013 and July 31, 2012 exclude approximately $5.9 million and $2.8 million, respectively, of commercial paper which is held to maturity and not subject to fair value measurements.