CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	6 Months Ended
	Jan. 31, 2012	Jan. 31, 2011
OPERATING ACTIVITIES:
Net income	$ 23,641	$ 7,890
Income from discontinued operations		289
Gain on disposal of discontinued operations		924
Income from continuing operations	23,641	6,677
Adjustments to reconcile income from continuing operations to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes	2,213	(2,194)
Depreciation and amortization	9,205	8,756
Allowance for doubtful accounts	237	(9)
Gain on sale of other investments	(2,500)
Net (gain) loss on sale of property, plant, and equipment	(20)	2
Bargain purchase gain		(1,042)
Share-based compensation expense	5,401	4,552
Fair value adjustment of contingent consideration	43
Excess tax provision for share-based compensation	(21)	96
Net changes in operating assets and liabilities, net of acquired business (Note 12)	624	(9,290)
NET CASH PROVIDED BY CONTINUING OPERATIONS FOR OPERATING ACTIVITIES	38,823	7,548
NET CASH USED FOR DISCONTINUED OPERATIONS FOR OPERATING ACTIVITIES		(335)
NET CASH PROVIDED BY OPERATING ACTIVITIES	38,823	7,213
INVESTING ACTIVITIES:
Proceeds from sale of discontinued operations, net		10,467
Acquisition of business		(346)
Additions to property, plant, and equipment	(17,278)	(12,048)
Proceeds from the sale of other investments	2,500
Proceeds from the sale of property, plant, and equipment	28	123
NET CASH USED FOR INVESTING ACTIVITIES	(14,750)	(1,804)
FINANCING ACTIVITIES:
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	446	273
Excess tax provision for share-based compensation	21	(96)
Purchase of common stock	(15,612)	(11,149)
Dividends paid to shareholders	(2,609)	(2,605)
NET CASH USED FOR FINANCING ACTIVITIES	(17,754)	(13,577)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(1,669)	1,509
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	4,650	(6,659)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	169,656	169,254
CASH AND CASH EQUIVALENTS, END OF PERIOD	174,306	162,595
Supplemental disclosures of cash flow information:
Refunds received (cash paid) for income taxes, net	$ 8,928	$ (5,840)