Restructuring (Schedule Of Restructuring Expense) (Details) (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2011
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 759
Cost Of Sales [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	20
Operating Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring expenses	$ 739