Liquidation Basis of Accounting - Additional Information (Detail) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
	Jan. 30, 2016	Jan. 30, 2016	Jul. 31, 2015
Statutory Accounting Practices [Line Items]
Net assets in liquidation	$ 9,130	$ 9,130	$ 10,080
Cash and cash equivalents	12,620	12,620
Other assets	50	50
Accounts payable	100	100
Reserve for estimated costs during the Dissolution period	1,850	1,850
Other liabilities	1,590	1,590
Decrease in net assets	(950)	(950)
(Increase) decrease in estimated costs during the dissolution period	1,440	1,440
Reserve for Previously Estimated Costs
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the dissolution period	440	440
Accrued Expenses
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the dissolution period	50	50
Other expenses associated with wind-down activities
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the dissolution period	380	380
Other expenses associated with wind-down activities | Reserve for Previously Estimated Costs
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	350	350
Compensation and consulting costs
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the dissolution period	450	450
Compensation and consulting costs | Reserve for Previously Estimated Costs
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	50	50
Professional fees
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the dissolution period	300	300
Professional fees | Reserve for Previously Estimated Costs
Statutory Accounting Practices [Line Items]
Reserve for estimated costs during the Dissolution period	40	40
Insurance
Statutory Accounting Practices [Line Items]
(Increase) decrease in estimated costs during the dissolution period	310	310
IQstream Patents
Statutory Accounting Practices [Line Items]
Net assets in liquidation	$ 0	$ 0