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Description Of Business And Summary Of Significant Accounting Policies - Cumulative effects of foreign currency exchange rate fluctuations (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended		12 Months Ended
	Apr. 30, 2013	Apr. 30, 2012	Apr. 30, 2013	Apr. 30, 2012	Jul. 31, 2012
Cumulative Translation Adjustment Summary [Roll Forward]
Cumulative loss on foreign currency translation, Begining balance			$ (34,933)	$ (23,225)	$ (23,225)
Gain (Loss) on foreign currency translation	(4,507)	8,020	446	(1,594)	(11,708)
Cumulative loss on foreign currency translation, Ending balance	$ (34,487)		$ (34,487)		$ (34,933)

X

- Definition

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

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Amount after tax and reclassification adjustments, resulting from the process of expressing in the reporting currency of the reporting entity those amounts that are denominated or measured in a different currency, and from transactions whose terms are denominated in a currency other than the entity's functional currency, which is attributable to the parent entity.

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