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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 $ 4,582tho_CostOfUnitsRepurchased $ 326tho_CostOfUnitsRepurchased $ 6,227tho_CostOfUnitsRepurchased $ 449tho_CostOfUnitsRepurchased
Realization of units resold 3,721tho_RealizationOfUnitsResold 289tho_RealizationOfUnitsResold 5,161tho_RealizationOfUnitsResold 390tho_RealizationOfUnitsResold
Losses due to repurchase $ 861tho_LossesDueToRepurchase $ 37tho_LossesDueToRepurchase $ 1,066tho_LossesDueToRepurchase $ 59tho_LossesDueToRepurchase