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Contingent Liabilities And Commitments (Losses Due To Repurchases Under Repurchase Agreements) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011	Apr. 30, 2012	Apr. 30, 2011
Contingent Liabilities And Commitments [Abstract]
Cost of units repurchased	$ 953	$ 398	$ 2,761	$ 5,466
Realization of units resold	863	342	2,445	4,669
Losses due to repurchase	$ 90	$ 56	$ 316	$ 797

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- Definition

Cost of units repurchased

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- Definition

Losses Due To Repurchase.

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- Definition

Realization of units resold

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No definition available.

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