Financial Instruments (Impact On Accumulated Other Comprehensive Income (Loss) And Earnings From Foreign Exchange Contracts That Qualified As Cash Flow Hedges) (Details) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Financial Instruments [Abstract]
Net carrying amount at beginning of year	$ 241	$ (660)
Cash flow hedges deferred in other comprehensive income	1,793	(425)
Cash flow hedges reclassified to income (effective portion)	(1,938)	1,048
Change in deferred taxes	169	(218)
Net carrying amount at April 30	$ 265	$ (255)