Derivatives and Hedging Activities (Details 1) (Cash Flow Hedging [Member], USD $) In Thousands	12 Months Ended
Jul. 31, 2011	Jul. 31, 2010
Gain (loss) on derivative instruments designated as cash flow hedges
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	$ (1,535)	$ (493)
Amount of Gain or (Loss) Reclassified From Accumulated OCI Into Income (Effective Portion)	(1,781)	(80)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	0	0
Foreign Exchange Contract [Member]
Gain (loss) on derivative instruments designated as cash flow hedges
Amount of Gain or (Loss) Recognized in OCI on Derivative (Effective Portion)	(1,535)	(493)
Foreign Exchange Contract [Member] \| Cost of goods sold [Member]
Gain (loss) on derivative instruments designated as cash flow hedges
Amount of Gain or (Loss) Reclassified From Accumulated OCI Into Income (Effective Portion)	(1,781)	(80)
Amount of Gain or (Loss) Recognized in Income on Derivative (Ineffective Portion)	$ 0	$ 0

Schedule Of Derivative Instruments Gain Loss In Statement Of Income Designated As Hedging Instruments.

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- Definition

The income statement location of the effective portion of net gain or loss reclassified from accumulated other comprehensive income into income on derivative instruments designated and qualifying as hedging instruments.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b
-Clause 3

+ Details

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

+ Details

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- Definition

The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

+ Details

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