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Losses Due to Repurchases under Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2014 | Jan. 31, 2013 | Jan. 31, 2014 | Jan. 31, 2013
Loss Contingencies [Line Items] |  |  |  |
Cost of units repurchased | $ 326 | $ 1,526 | $ 449 | $ 2,128
Realization of units resold | 289 | 1,264 | 390 | 1,769
Losses due to repurchase | $ 37 | $ 262 | $ 59 | $ 359

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- Details
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