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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 | ||
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Apr. 30, 2012
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Apr. 30, 2011
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Apr. 30, 2012
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Apr. 30, 2011
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| 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 |