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	3 Months Ended
	Oct. 31, 2011	Oct. 31, 2010
Financial Instruments [Abstract]
Net carrying amount at beginning of year	$ 241	$ (660)
Cash flow hedges deferred in other comprehensive income	510	(569)
Cash flow hedges reclassified to income (effective portion)	(333)	198
Change in deferred taxes	256	130
Net carrying amount at October 31	$ 674	$ (901)