Reserve for Estimated Costs (Detail) - Liquidation Basis of Accounting - USD ($) $ in Thousands	Jul. 31, 2015	Jul. 31, 2014
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	$ 1,776	$ 3,462
Compensation
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	376	1,004
Professional fees
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	568	1,154
Other expenses associated with wind-down activities
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	646	1,010
Insurance
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	$ 186	$ 294