XML 26 R67.htm IDEA: XBRL DOCUMENT v2.4.0.8
Losses Due to Repurchases under Repurchase Agreements (Detail) (USD $)
In Thousands, unless otherwise specified
 12 Months Ended
Jul. 31, 2013
Jul. 31, 2012
Jul. 31, 2011
Loss Contingencies [Line Items]      
Cost of units repurchased $ 6,926 $ 2,881 $ 5,876
Realization of units resold 6,020 2,521 5,023
Losses due to repurchase $ 906 $ 360 $ 853