Consolidated Statement of Net Assets (Liquidation Basis) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	Apr. 26, 2014	Jul. 31, 2013
Liabilities and Net Assets
Reserve for estimated costs during the Dissolution period	$ 3,803	$ 8,336
Corporate Liquidity
Assets
Cash and cash equivalents	19,539	21,041
Land	2,948	2,948
Patents	300
Other assets	77	100
Total assets	22,864	24,089
Liabilities and Net Assets
Accrued expenses	52	133
Reserve for estimated costs during the Dissolution period	3,803	8,336
Other liabilities	2,017	1,983
Total liabilities	5,872	10,452
Net assets in liquidation	$ 16,992	$ 13,637
Shares outstanding	28,882,093	28,882,093
Net assets in liquidation per share	$ 0.59	$ 0.47