Schedule of Restructuring Accruals (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012		Jul. 31, 2011		Jul. 31, 2010		Jul. 31, 2009
Restructuring Cost and Reserve [Line Items]
Accrued restructuring begging balance	$ 1,464	[1]	$ 3,632	[1]	$ 16,644	[1]	$ 9,911	[1]
Restructuring charges	7,755		1,099		744		21,761
Restructuring adjustments	(300)		(304)		(1,709)		(2,420)
Cash paid	(7,259)		(3,007)		(12,324)		(11,928)
Non-cash adjustments	64		44		277		(680)
Accrued restructuring ending balance	1,724		1,464	[1]	3,632	[1]	16,644	[1]
Employee Related Expenses [Member]
Restructuring Cost and Reserve [Line Items]
Accrued restructuring begging balance	296	[1]	181	[1]	6,842	[1]	1,848	[1]
Restructuring charges	6,218		1,099		54		16,292
Restructuring adjustments	(439)		53		(612)		(2,858)
Cash paid	(5,405)		(1,081)		(6,103)		(8,378)
Non-cash adjustments	(44)		44				(62)
Accrued restructuring ending balance	626		296	[1]	181	[1]	6,842	[1]
Contractual Obligations [Member]
Restructuring Cost and Reserve [Line Items]
Accrued restructuring begging balance	1,168	[1]	3,451	[1]	9,802	[1]	8,063	[1]
Restructuring charges	1,537				690		5,080
Restructuring adjustments	139		(357)		(1,097)		438
Cash paid	(1,854)		(1,926)		(6,221)		(3,550)
Non-cash adjustments	108				277		(229)
Accrued restructuring ending balance	1,098		1,168	[1]	3,451	[1]	9,802	[1]
Asset Impairments [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring charges							389
Non-cash adjustments							$ (389)

[1] As Restated