Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2013	Jul. 31, 2012	Jul. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 31,121	$ 43,071	$ 17,833
Income from discontinuing operations			289
Gain on disposal of discontinued operations			924
Income from continuing operations	31,121	43,071	16,620
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Provison for (benefit from) deferred income taxes	1,006	(3,050)	(1,646)
Depreciation and amortization	17,275	17,775	17,798
Bargain purchase gain			(1,042)
Fair value adjustment of contingent consideration	(25)	120
Share-based compensation expense	11,601	13,396	9,638
Excess tax benefit from share-based compensation	(2,053)	(184)	132
Other	1,188
Write-down of inventory to net realizable value	4,726	2,441	3,729
Allowance for doubtful accounts	345	200	26
Gain on sale of other investments		(2,500)
(Gain) Loss on sale of property, plant and equipment	(58)	(14)	170
Net changes in operating assets and liabilities, exclusive of acquisition related assets and liabilities:
Accounts receivable	(10,523)	(8,258)	(17,099)
Inventory	(2,127)	(7,206)	(20,550)
Refundable income taxes	42	312	(315)
Other current assets	(123)	2,525	2,578
Accounts payable	(11,991)	1,548	12,490
Accrued liabilities	(305)	3,948	4,078
Advance payments and deferred revenue	(2,445)	5,471	(54)
Accrued income taxes	854	3,850	1,298
Other liabilities	2,935	265	2,377
NET CASH PROVIDED BY CONTINUING OPERATIONS FOR OPERATING ACTIVITIES	41,443	73,710	30,228
NET CASH USED FOR DISCONTINUED OPERATIONS FOR OPERATING ACTIVITIES			(335)
NET CASH PROVIDED BY CONTINUING OPERATIONS FOR OPERATING ACTIVITIES	41,443	73,710	29,893
INVESTING ACTIVITIES:
Proceeds from sale of discontinued operations, net			10,467
Additions to property, plant, and equipment	(25,551)	(30,606)	(22,430)
Acquisition of business, net of cash acquired	(79,273)		(346)
Proceeds from the sale of other investments		2,500
Proceeds from the sale of property, plant, and equipment and other assets	146	207	1,323
NET CASH USED FOR INVESTING ACTIVITIES	(104,678)	(27,899)	(10,986)
FINANCING ACTIVITIES:
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	4,684	2,000	1,490
Shares repurchased for taxes for vested employee restricted stock grants	(4,661)	(471)	(1,169)
Repayments of other credit facilities	(3,014)
Borrowing of other credit facilities	2,230
Contingent consideration payment	(340)
Excess tax benefit from share-based compensation	2,053	184	(132)
Repurchase of common stock	(7,945)	(23,260)	(15,187)
Dividends paid to shareholders	(5,114)	(4,980)	(5,154)
NET CASH USED FOR FINANCING ACTIVITIES	(12,107)	(26,527)	(20,152)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	1,364	(1,929)	1,647
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(73,978)	17,355	402
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	187,011	169,656	169,254
CASH AND CASH EQUIVALENTS, END OF PERIOD	113,033	187,011	169,656
Supplemental disclosures of cash flow information:
Income taxes paid, net of refunds	11,339	(935)	8,643
Supplemental disclosure of non-cash investing activities:
Accounts payable amounts due on the construction of a manufacturing facilities	620	1,755	1,785
Other property, plant and equipment included in accounts payable	$ 1,000