Consolidated Statements Of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Jul. 31, 2012	Jul. 31, 2011	Jul. 31, 2010
OPERATING ACTIVITIES:
Net income	$ 43,071	$ 17,833	$ 15,555
Income (loss) from discontinued operations		289	(244)
Gain on disposal of discontinued operations		924
Income from continuing operations	43,071	16,620	15,799
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Benefit from deferred income taxes	(3,050)	(1,674)	(2,216)
Depreciation and amortization	17,775	17,798	16,814
Allowance for doubtful accounts	200	26	112
Fair value adjustment of contingent consideration	120
Net (gain) loss on sale of property, plant, and equipment	(14)	170	26
Gain on sale of other investments	(2,500)
Bargain purchase gain		(1,042)
Share-based compensation expense	13,396	9,638	5,791
Excess tax provision for share-based compensation	(184)	132	146
Net changes in operating assets and liabilities, net of acquired business (Note 18)	4,896	(11,440)	(10,123)
NET CASH PROVIDED BY CONTINUING OPERATIONS FOR OPERATING ACTIVITIES	73,710	30,228	26,349
NET CASH (USED BY) PROVIDED BY DISCONTINUED OPERATIONS FOR OPERATING ACTIVITIES		(335)	768
NET CASH PROVIDED BY OPERATING ACTIVITIES	73,710	29,893	27,117
INVESTING ACTIVITIES:
Proceeds from sale of discontinued operations, net		10,467
Acquisition of business		(346)
Additions to property, plant, and equipment	(30,606)	(22,430)	(9,300)
Investments in and advances to affiliated companies			(1,920)
Capitalized software development costs			(461)
Maturities of short-term held-to-maturity marketable securities			40,438
Proceeds from the sale of other investments	2,500
Proceeds from the sale of property, plant, and equipment and other assets	207	1,323	249
NET CASH (USED BY) PROVIDED BY CONTINUING OPERATIONS FOR INVESTING ACTIVITIES	(27,899)	(10,986)	29,006
NET CASH USED BY DISCONTINUED OPERATIONS FOR INVESTING ACTIVITIES			(107)
NET CASH (USED BY) PROVIDED FOR INVESTING ACTIVITIES	(27,899)	(10,986)	28,899
FINANCING ACTIVITIES:
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	1,529	321	670
Excess tax provision for share-based compensation	184	(132)	(146)
Purchase of common stock	(23,260)	(15,187)
Dividends paid to shareholders	(4,980)	(5,154)	(5,044)
NET CASH USED FOR FINANCING ACTIVITIES	(26,527)	(20,152)	(4,520)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(1,929)	1,647	(2,097)
NET INCREASE IN CASH AND CASH EQUIVALENTS	17,355	402	49,399
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	169,656	169,254	119,855
CASH AND CASH EQUIVALENTS, END OF PERIOD	187,011	169,656	169,254
Supplemental disclosures of cash flow information:
Refunds received (cash paid) for income taxes, net	$ 11,224	$ 8,643	$ (3,183)