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Losses Due to Repurchases under Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Jul. 31, 2012 | Jul. 31, 2011 | Jul. 31, 2010
Loss Contingencies [Line Items] |  |  |
Cost of units repurchased | $ 2,881 | $ 5,876 | $ 10,001
Realization of units resold | 2,521 | 5,023 | 8,665
Losses due to repurchase | $ 360 | $ 853 | $ 1,336

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- Definition Realization of units resold + References No definition available. + Details
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- Details
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