Income from Continuing Operations (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended																				12 Months Ended
	Jan. 31, 2012		Oct. 31, 2011		Jul. 31, 2011		Apr. 30, 2011		Jan. 31, 2011		Oct. 31, 2010		Jul. 31, 2010		Apr. 30, 2010		Jan. 31, 2010		Oct. 31, 2009		Jul. 31, 2012	Jul. 31, 2011		Jul. 31, 2010		Jul. 31, 2009
Income (loss) from continuing operations before income taxes:
U.S.																					$ (39,030)	$ (47,697)	[1]	$ (29,494)	[1]	$ (133,240)	[1]
Foreign																					3,466	14,381	[1]	13,133	[1]	(55,438)	[1]
Income (loss) from continuing operations before income taxes	$ (13,166)	[1]	$ 3,016	[1]	$ (7,314)	[1]	$ 2,900	[1]	$ (28,044)	[1]	$ (858)	[1]	$ (26,702)	[1]	$ (2,053)	[1]	$ 3,360	[1]	$ 9,033	[1]	$ (35,564)	$ (33,316)	[1]	$ (16,361)	[1]	$ (188,678)	[1]

[1] As Restated