Reserve for Estimated Costs (Detail) - USD ($) $ in Thousands	Oct. 31, 2015	Jul. 31, 2015
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	$ 1,402
Liquidation Basis of Accounting
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	1,402	$ 1,776
Liquidation Basis of Accounting | Compensation
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	299	376
Liquidation Basis of Accounting | Professional fees
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	516	568
Liquidation Basis of Accounting | Other expenses associated with wind-down activities
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period	$ 587	646
Liquidation Basis of Accounting | Insurance
Accrued Expenses [Line Items]
Reserve for estimated costs during the Dissolution period		$ 186