Effects of Restatement Adjustments on Unaudited Condensed Consolidated Statements of Operations (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended				6 Months Ended
	Jan. 31, 2013	Oct. 31, 2012	Jan. 31, 2012		Jan. 31, 2013	Jan. 31, 2012
Condensed Financial Statements, Captions [Line Items]
Net revenue	$ 203,436		$ 169,435	[1]	$ 400,487	$ 367,265	[1]
Cost of revenue	183,158		154,026	[1]	361,585	326,084	[1]
Gross profit	20,278		15,409	[1]	38,902	41,181	[1]
Operating expenses
Selling, general and administrative	23,721		23,181	[1]	47,862	44,330	[1]
Amortization of intangible assets	285		285	[1]	569	569	[1]
Restructuring, net	4,798	1,500	4,463	[1]	6,268	5,219	[1]
Total operating expenses	28,804		27,929	[1]	54,699	50,118	[1]
Operating income (loss)	(8,526)		(12,520)	[1]	(15,797)	(8,937)	[1]
Other income (expense):
Interest income	88		122	[1]	166	244	[1]
Interest expense	(101)		(98)	[1]	(199)	(189)	[1]
Other gains, net	(978)		825	[1]	(2,299)	2,052	[1]
Equity in losses of affiliates and impairments	(2,226)		(290)	[1]	(2,536)	(717)	[1]
Total other income (expense)	(3,217)		559	[1]	(4,868)	1,390	[1]
Income (loss) from continuing operations before income taxes	(11,743)		(11,961)	[1]	(20,665)	(7,547)	[1]
Income tax expense	674		380	[1]	1,583	2,251	[1]
Income (loss) from continuing operations	(12,417)		(12,341)	[1]	(22,248)	(9,798)	[1]
Discontinued operations, net of income taxes:
Loss from discontinued operations	(133)		(535)	[1]	(960)	(1,933)	[1]
Net income (loss)	(12,550)		(12,876)	[1]	(23,208)	(11,731)	[1]
Basic and diluted earnings (loss) per share:
Income (loss) from continuing operations	$ (0.29)		$ (0.29)	[1]	$ (0.51)	$ (0.23)	[1]
Loss from discontinued operations			$ (0.01)	[1]	$ (0.02)	$ (0.04)	[1]
Net income (loss)	$ (0.29)		$ (0.30)	[1]	$ (0.53)	$ (0.27)	[1]
Shares used in computing basic earnings per share:	43,654		43,434	[1]	43,629	43,367	[1]
Shares used in computing diluted earnings per share:	43,654		43,434	[1]	43,629	43,367	[1]
Previously Reported
Condensed Financial Statements, Captions [Line Items]
Net revenue			169,699			367,772
Cost of revenue			154,029			326,308
Gross profit			15,670			41,464
Operating expenses
Selling, general and administrative			23,181			44,330
Amortization of intangible assets			285			569
Restructuring, net			4,463			5,219
Total operating expenses			27,929			50,118
Operating income (loss)			(12,259)			(8,654)
Other income (expense):
Interest income			122			244
Interest expense			(96)			(185)
Other gains, net			825			2,052
Equity in losses of affiliates and impairments			(290)			(717)
Total other income (expense)			561			1,394
Income (loss) from continuing operations before income taxes			(11,698)			(7,260)
Income tax expense			380			2,251
Income (loss) from continuing operations			(12,078)			(9,511)
Discontinued operations, net of income taxes:
Loss from discontinued operations			(535)			(1,933)
Net income (loss)			(12,613)			(11,444)
Basic and diluted earnings (loss) per share:
Income (loss) from continuing operations			$ (0.28)			$ (0.22)
Loss from discontinued operations			$ (0.01)			$ (0.04)
Net income (loss)			$ (0.29)			$ (0.26)
Shares used in computing basic earnings per share:			43,434			43,367
Shares used in computing diluted earnings per share:			43,434			43,367
Restatement Pricing Adjustments
Condensed Financial Statements, Captions [Line Items]
Net revenue			(496)			(913)
Gross profit			(496)			(913)
Operating expenses
Operating income (loss)			(496)			(913)
Other income (expense):
Income (loss) from continuing operations before income taxes			(496)			(913)
Income (loss) from continuing operations			(496)			(913)
Discontinued operations, net of income taxes:
Net income (loss)			(496)			(913)
Basic and diluted earnings (loss) per share:
Income (loss) from continuing operations			$ (0.01)			$ (0.02)
Net income (loss)			$ (0.01)			$ (0.02)
Restatement Other Adjustments
Condensed Financial Statements, Captions [Line Items]
Net revenue			232			406
Cost of revenue			(3)			(224)
Gross profit			235			630
Operating expenses
Operating income (loss)			235			630
Other income (expense):
Interest expense			(2)			(4)
Total other income (expense)			(2)			(4)
Income (loss) from continuing operations before income taxes			233			626
Income (loss) from continuing operations			233			626
Discontinued operations, net of income taxes:
Net income (loss)			$ 233			$ 626
Basic and diluted earnings (loss) per share:
Income (loss) from continuing operations						$ 0.01
Net income (loss)						$ 0.01

[1] As Restated