Accrued Costs Expected to be Incurred in Liquidation (Detail) (USD $) In Thousands, unless otherwise specified	Mar. 24, 2013	Jul. 31, 2012
Accrued Expenses [Line Items]
Restructuring	$ 3,309
Compensation	3,539
Professional fees	3,672
Other expenses associated with wind down activities	2,725
Insurance	1,500
Accrued expenses	$ 14,745