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Losses Due to Repurchases Related to Repurchase Agreements (Detail) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jan. 31, 2015 | Jan. 31, 2014 | Jan. 31, 2015 | Jan. 31, 2014
Loss Contingencies [Line Items] |  |  |  |
Cost of units repurchased | $ 4,582 tho_CostOfUnitsRepurchased | $ 326 tho_CostOfUnitsRepurchased | $ 6,227 tho_CostOfUnitsRepurchased | $ 449 tho_CostOfUnitsRepurchased
Realization of units resold | 3,721 tho_RealizationOfUnitsResold | 289 tho_RealizationOfUnitsResold | 5,161 tho_RealizationOfUnitsResold | 390 tho_RealizationOfUnitsResold
Losses due to repurchase | $ 861 tho_LossesDueToRepurchase | $ 37 tho_LossesDueToRepurchase | $ 1,066 tho_LossesDueToRepurchase | $ 59 tho_LossesDueToRepurchase

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