Consolidated Statement of Changes in Net Assets (Liquidation Basis) (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended			12 Months Ended		0 Months Ended	4 Months Ended	12 Months Ended		4 Months Ended		12 Months Ended		4 Months Ended	12 Months Ended	4 Months Ended	12 Months Ended		4 Months Ended
	Jul. 31, 2014	Mar. 23, 2013	Jul. 31, 2012	Jul. 31, 2014 Other Assets	Jul. 31, 2014 Land	Jul. 29, 2014 Liquidation Basis of Accounting	Jul. 31, 2013 Liquidation Basis of Accounting	Jul. 31, 2014 Liquidation Basis of Accounting	Mar. 23, 2013 Liquidation Basis of Accounting	Jul. 31, 2013 Liquidation Basis of Accounting Forfeited Deposit [Member]	Jul. 31, 2013 Liquidation Basis of Accounting Accounting Standards Update 2013-07 Liability	Jul. 31, 2014 Liquidation Basis of Accounting Patents	Jul. 31, 2014 Liquidation Basis of Accounting Other Liabilities	Jul. 31, 2013 Liquidation Basis of Accounting Other Assets	Jul. 31, 2014 Liquidation Basis of Accounting Other Assets	Jul. 31, 2013 Liquidation Basis of Accounting Property, Plant and Equipment Land	Jul. 31, 2014 Liquidation Basis of Accounting Property, Plant and Equipment Land	Jul. 31, 2014 Liquidation Basis of Accounting Other Receivables	Jul. 31, 2013 Liquidation Basis of Accounting Assets Accounting Standards Update 2013-07
Effects of adopting the liquidation basis of accounting as of March 24, 2013:
Initial adjustment of assets (liabilities) to estimated net realizable (settlement) value							$ 2,883				$ (14,745)								$ 2,883
Net assets in liquidation, beginning balance							15,144	13,637
Liquidating distribution						(6,930)		(6,932)
Increase (Decrease) in estimated net realizable value on asset	2,990			27	(448)							2,300		(2,700)	27	(552)	(448)	1,107
Decrease in liabilities	263									125			263
(Increase) decrease in estimated costs during the Dissolution period	(458)						1,620	(458)
Net assets in liquidation, ending balance							13,637	9,496
Stockholders' equity as of March 23, 2013		$ 27,006	$ 442,231						$ 27,006