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		6 Months Ended
	Jan. 31, 2013	Jan. 31, 2012	Jan. 31, 2013	Jan. 31, 2012
Financial Instruments [Abstract]
Net carrying amount at beginning of year			$ (373)	$ 241
Cash flow hedges deferred in other comprehensive income			(202)	1,674
Cash flow hedges reclassified to income (effective portion)			563	(903)
Change in deferred taxes	(307)	(58)	(198)	(314)
Net carrying amount at January 31	$ (210)	$ 698	$ (210)	$ 698