Fair value (Tables)

12 Months Ended

Jul. 31, 2012

Assets and Liabilities Carried at Fair Value Measured on Recurring Basis

The following table provides the assets and liabilities carried at fair value measured on a recurring basis at July 31, 2012 and July 31, 2011:

	Fair Value Measurements at July 31, 2012 using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total Carrying Value
Cash equivalents	$	—	$	14,590	$	—	$	14,590
Foreign currency forward contracts		66		—		—		66
Total assets	$	66	$	14,590	$	—	$	14,656
Contingent consideration	$	—	$	—	$	460	$	460
Total liabilities	$	—	$	—	$	460	$	460

	Fair Value Measurements at July 31, 2011 using
	Quoted Prices in Active Markets for Identical Assets Level 1		Significant Other Observable Inputs Level 2		Significant Unobservable Inputs Level 3		Total Carrying Value
Cash equivalents	$	—	$	9,600	$	—	$	9,600
Total assets	$	—	$	9,600	$	—	$	9,600
Contingent consideration	$	—	$	—	$	340	$	340
Total liabilities	$	—	$	—	$	340	$	340