Effects of Restatement Adjustments on Unaudited Condensed Consolidated Statements of Cash Flows (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jan. 31, 2012		Jan. 31, 2013	Jan. 31, 2012
Cash flows from operating activities of continuing operations:
Net income (loss)	$ (12,876)	[1]	$ (23,208)	$ (11,731)	[1]
Loss from discontinued operations	(535)	[1]	(960)	(1,933)	[1]
Income (loss) from continuing operations	(12,341)	[1]	(22,248)	(9,798)	[1]
Adjustments to reconcile income (loss) from continuing operations to net cash used in operating activities of continuing operations:
Depreciation	3,511	[1]	6,849	7,224	[1]
Amortization of intangible assets	285	[1]	569	569	[1]
Share-based compensation	998	[1]	915	1,880	[1]
Non-operating (gains) losses, net	(825)	[1]	2,299	(2,052)	[1]
Equity in losses of affiliates and impairments	290	[1]	2,536	717	[1]
Changes in operating assets and liabilities:
Trade accounts receivable, net			1,622	(13,825)	[1]
Inventories			2,026	(21,019)	[1]
Prepaid expenses and other current assets			(1,138)	(787)	[1]
Accounts payable, accrued restructuring and accrued expenses			12,184	29,748	[1]
Refundable and accrued income taxes, net			(2,605)	(576)	[1]
Other assets and liabilities			736	2,964	[1]
Net cash provided by (used in) operating activities of continuing operations			3,764	(4,955)	[1]
Cash flows from investing activities of continuing operations:
Additions to property and equipment			(3,570)	(4,765)	[1]
Proceeds from the sale of equity investments in affiliates				8	[1]
Investments in affiliates			(1,450)	(1,052)	[1]
Net cash used in investing activities of continuing operations			(4,172)	(5,809)	[1]
Cash flows from financing activities of continuing operations:
Repayments on capital lease obligations			(30)	(59)	[1]
Proceeds from issuance of common stock				61	[1]
Repurchase of common stock			(152)	(175)	[1]
Net cash used in financing activities of continuing operations			(182)	(173)	[1]
Cash flows from discontinued operations:
Operating cash flows			(1,357)	(771)	[1]
Investing cash flows				(184)	[1]
Net cash used in discontinued operations			(1,357)	(955)	[1]
Net effect of exchange rate changes on cash and cash equivalents			1,448	(3,715)	[1]
Net increase in cash and cash equivalents			(499)	(15,607)	[1]
Cash and cash equivalents at beginning of period			52,369	111,225	[1]
Cash and cash equivalents at end of period	95,618	[1]	51,790	95,618	[1]
Previously Reported
Cash flows from operating activities of continuing operations:
Net income (loss)	(12,613)			(11,444)
Loss from discontinued operations	(535)			(1,933)
Income (loss) from continuing operations	(12,078)			(9,511)
Adjustments to reconcile income (loss) from continuing operations to net cash used in operating activities of continuing operations:
Depreciation				7,196
Amortization of intangible assets	285			569
Share-based compensation				1,880
Non-operating (gains) losses, net	(825)			(2,052)
Equity in losses of affiliates and impairments	290			717
Changes in operating assets and liabilities:
Trade accounts receivable, net				(13,825)
Inventories				(20,800)
Prepaid expenses and other current assets				(787)
Accounts payable, accrued restructuring and accrued expenses				29,748
Refundable and accrued income taxes, net				(576)
Other assets and liabilities				2,457
Net cash provided by (used in) operating activities of continuing operations				(4,984)
Cash flows from investing activities of continuing operations:
Additions to property and equipment				(4,765)
Proceeds from the sale of equity investments in affiliates				8
Investments in affiliates				(1,052)
Net cash used in investing activities of continuing operations				(5,809)
Cash flows from financing activities of continuing operations:
Repayments on capital lease obligations				(30)
Proceeds from issuance of common stock				61
Repurchase of common stock				(175)
Net cash used in financing activities of continuing operations				(144)
Cash flows from discontinued operations:
Operating cash flows				(771)
Investing cash flows				(184)
Net cash used in discontinued operations				(955)
Net effect of exchange rate changes on cash and cash equivalents				(3,715)
Net increase in cash and cash equivalents				(15,607)
Cash and cash equivalents at beginning of period				111,225
Cash and cash equivalents at end of period	95,618			95,618
Restatement Pricing Adjustments
Cash flows from operating activities of continuing operations:
Net income (loss)	(496)			(913)
Income (loss) from continuing operations	(496)			(913)
Changes in operating assets and liabilities:
Other assets and liabilities				913
Cash flows from discontinued operations:
Cash and cash equivalents at end of period
Restatement Other Adjustments
Cash flows from operating activities of continuing operations:
Net income (loss)	233			626
Income (loss) from continuing operations	233			626
Adjustments to reconcile income (loss) from continuing operations to net cash used in operating activities of continuing operations:
Depreciation				28
Changes in operating assets and liabilities:
Inventories				(219)
Other assets and liabilities				(406)
Net cash provided by (used in) operating activities of continuing operations				29
Cash flows from financing activities of continuing operations:
Repayments on capital lease obligations				(29)
Net cash used in financing activities of continuing operations				(29)
Cash flows from discontinued operations:
Cash and cash equivalents at end of period

[1] As Restated