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, 2012	Oct. 31, 2011
Financial Instruments [Abstract]
Net carrying amount at beginning of year	$ (373)	$ 241
Cash flow hedges deferred in other comprehensive income	(786)	510
Cash flow hedges reclassified to income (effective portion)	399	(333)
Change in deferred taxes	109	256
Net carrying amount at October 31	$ (651)	$ 674