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	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011
Financial Instruments [Abstract]
Net carrying amount at beginning of year	$ 241	$ (660)
Cash flow hedges deferred in OCI	2,229	(782)
Cash flow hedges reclassified to income (effective portion)	(2,960)	1,963
Change in deferred taxes	117	(280)
Net carrying amount at July 31	$ (373)	$ 241