Restructuring (Schedule Of Restructuring Expense) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 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