Consolidated Statement of Net Assets (Liquidation Basis) (Detail) (USD $) In Thousands, unless otherwise specified	Apr. 27, 2013	Mar. 23, 2013	Jul. 31, 2012	Apr. 28, 2012	Jul. 31, 2011
Assets
Cash and cash equivalents	$ 20,614	$ 19,824	$ 136,654	$ 60,683	$ 60,765
Land	3,500
Other assets	4,566
Total assets	28,680
Liabilities and Net Assets
Accounts payable	72
Accrued expenses	471
Accrued restructuring costs	297	3,309
Reserve for estimated costs during the liquidation period	10,631	14,745
Other liabilities	2,065
Total liabilities	13,536
Net assets (liquidation basis)	$ 15,144