Valuation And Qualifying Accounts (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012		Jul. 31, 2011		Jul. 31, 2010
Valuation And Qualifying Accounts [Abstract]
Balance at Beginning of Period	$ 6,908		$ 6,315		$ 7,387
Charged to Costs and Expenses	1,151		482		1,063
Charged to Other Accounts	(676)	[1]	481	[1]	(293)	[1]
Deductions	(965)	[2]	(370)	[2]	(1,842)	[2]
Balance at End of Period	$ 6,418		$ 6,908		$ 6,315

[1] Allowance for doubtful accounts foreign currency translation losses (gains) recorded directly to equity.

[2] Bad debts charged to allowance, net of reserves and changes in estimates.