Restructuring (Schedule Of Restructuring Expense) (Details) (USD $) In Thousands	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010	Jul. 31, 2009
Restructuring expenses	$ 759	$ 10,165	$ 17,755
Gross Margin [Member]
Restructuring expenses	20	7,488	10,109
Operating Expenses [Member]
Restructuring expenses	$ 739	$ 2,677	$ 7,646