CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Apr. 30, 2012	Apr. 30, 2011
OPERATING ACTIVITIES:
Net income	$ 30,971	$ 12,208
Income from discontinued operations		289
Gain on disposal of discontinued operations		924
Income from continuing operations	30,971	10,995
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes	846	(3,261)
Depreciation and amortization	13,729	13,160
Allowance for doubtful accounts	200	(146)
Gain on sale of other investments	(2,500)
(Gain) loss on sale of property, plant, and equipment	(21)	119
Bargain purchase gain		(1,042)
Share-based compensation expense	7,716	7,297
Fair value adjustment of contingent consideration	43
Excess tax provision for share-based compensation	26	116
Net changes in operating assets and liabilities, net of acquired business (Note 13)	8,256	(21,893)
NET CASH PROVIDED BY CONTINUING OPERATIONS FOR OPERATING ACTIVITIES	59,266	5,345
NET CASH USED FOR DISCONTINUED OPERATIONS FOR OPERATING ACTIVITIES		(335)
NET CASH PROVIDED BY OPERATING ACTIVITIES	59,266	5,010
INVESTING ACTIVITIES:
Proceeds from sale of discontinued operations, net		10,467
Acquisition of business		(346)
Additions to property, plant, and equipment	(22,588)	(15,434)
Proceeds from the sale of other investments	2,500
Proceeds from the sale of property, plant, and equipment	97	123
NET CASH USED FOR INVESTING ACTIVITIES	(19,991)	(5,190)
FINANCING ACTIVITIES:
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	1,124	315
Excess tax provision for share-based compensation	(26)	(116)
Purchase of common stock	(15,795)	(13,767)
Dividends paid to shareholders	(3,763)	(3,850)
NET CASH USED FOR FINANCING ACTIVITIES	(18,460)	(17,418)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(926)	1,954
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	19,889	(15,644)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	169,656	169,254
CASH AND CASH EQUIVALENTS, END OF PERIOD	189,545	153,610
Supplemental disclosures of cash flow information:
Refunds received (cash paid) for income taxes, net	$ 6,392	$ (6,478)