Restructuring (Schedule Of Restructuring Expense) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2011	Jul. 31, 2010
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 759	$ 10,165
Gross Margin [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	20	7,488
Operating Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 739	$ 2,677