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	6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
Financial Instruments [Abstract]
Net carrying amount at beginning of year	$ 241	$ (660)
Cash flow hedges deferred in other comprehensive income	1,046	(1,078)
Cash flow hedges reclassified to income (effective portion)	(903)	1,312
Change in deferred taxes	314	(71)
Net carrying amount at January 31	$ 698	$ (497)