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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, 2014 | Jul. 31, 2013 | Jul. 31, 2012
Loss Contingencies [Line Items] |  |  |
Cost of units repurchased | $ 1,386 | $ 6,926 | $ 2,881
Realization of units resold | 1,098 | 6,020 | 2,521
Losses due to repurchase | $ 288 | $ 906 | $ 360

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- Definition Realization of units resold + References No definition available. + Details
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Balance Type: | credit
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- Details
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