Stock Option Activity (Detail) (USD $)	8 Months Ended	12 Months Ended
	Mar. 23, 2013	Jul. 31, 2012
Number of Shares
Beginning balance, Number of Shares	10,756,844
Options granted, Number of Shares
Options exercised, Number of Shares	(2,800)
Options cancelled, Number of Shares	(10,754,044)
Ending balance, Number of Shares	0	10,756,844
Options vested and expected to vest	0
Options exercisable as of March 23, 2013	0
Weighted-Average Exercise Price
Beginning balance, Weighted Average Exercise Price	$ 3.97
Options granted, Weighted Average Exercise Price
Options exercised, Weighted Average Exercise Price	$ 13.22
Options cancelled, Weighted Average Exercise Price	$ 3.97
Ending balance, Weighted Average Exercise Price	$ 0.00	$ 3.97
Options vested and expected to vest, Weighted Average Exercise Price	$ 0.00
Options exercisable as of March 23, 2013	$ 0.00
Weighted-Average Remaining Contractual Term (years)
Options Outstanding at July 31, 2012, Weighted Average Contractual Term (Years)	0 years	6 years 11 days
Options vested and expected to vest, Weighted Average Contractual Term (Years)	0 years
Options exercisable as of March 23, 2013, Weighted Average Contractual Term (Years)	0 years