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Derivatives and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
Gain (loss) on derivative instruments designated as cash flow hedges
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 227	$ (953)
Foreign Exchange Contract [Member] \| Other Income (Expense) [Member]
Gain (loss) on derivative instruments designated as cash flow hedges
Amount of Gain or (Loss) Recognized in Income on Derivative	$ 227	$ (953)

The amount of net gains and losses recognized in income during the period on derivative instruments designated and qualifying as hedging instruments in fair value hedges and related hedged items designated and qualifying in fair value hedges, on derivative instruments designated and qualifying as hedging instruments in cash flow hedges, and on derivative instruments not designated as hedging instruments.

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