Consolidated Statements of Cash Flows - USD ($) $ in Thousands	12 Months Ended
	Jul. 31, 2015	Jul. 31, 2014	Jul. 31, 2013
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 33,481	$ 34,480	$ 31,121
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes	4,404	(5,412)	1,006
Depreciation and amortization	23,307	22,057	17,275
Share-based compensation expense	10,938	11,512	11,601
Amortization of demo equipment	5,037	3,918	4,726
Excess tax benefit from share-based compensation	(1,134)	(3,982)	(2,053)
Change in fair value of contingent consideration	(62)	125	(25)
Provision for doubtful accounts, net of recovery	420	203	345
Loss on sale of other investments		484
(Gain) loss on sale of property, plant and equipment	(115)	17	(58)
Other			1,188
Net changes in operating assets and liabilities, exclusive of acquisition-related assets and liabilities:
Accounts receivable	(16,050)	6,633	(10,523)
Inventory	(14,714)	(12,347)	(2,127)
Other current assets	(387)	2,525	(123)
Accounts payable	(7,281)	3,222	(11,991)
Accrued liabilities	4,755	(9,100)	(305)
Deferred revenue	(5,433)	1,533	(2,885)
Customer deposits	965	(213)	440
Accrued income taxes	(1,895)	(8,769)	896
Other liabilities	2,474	1,045	2,935
NET CASH PROVIDED BY OPERATING ACTIVITIES	38,710	47,931	41,443
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(9,954)	(17,517)	(25,551)
Acquisition of businesses, net of cash acquired	(1,600)	(10,561)	(79,273)
Purchases of marketable securities in Rabbi Trust under the Non-qualified Deferred Compensation Plan		(715)
Proceeds from the sale of property, plant, and equipment	559	260	146
NET CASH USED IN INVESTING ACTIVITIES	(10,995)	(28,533)	(104,678)
CASH FLOWS FROM FINANCING ACTIVITIES:
Repayment of other credit facilities			(3,014)
Borrowing of other credit facilities			2,230
Contingent consideration payment			(340)
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	7,893	5,379	4,684
Repurchase of common stock	(13,872)	(14,959)	(7,945)
Shares repurchased for taxes for vested employee restricted stock grants	(2,832)	(7,680)	(4,661)
Excess tax benefit from share-based compensation	1,134	3,982	2,053
Dividends paid to shareholders	(5,111)	(4,962)	(5,114)
NET CASH USED IN FINANCING ACTIVITIES	(12,788)	(18,240)	(12,107)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(5,667)	349	1,364
NET INCREASE IN CASH AND CASH EQUIVALENTS	9,260	1,507	(73,978)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	114,540	113,033	187,011
CASH AND CASH EQUIVALENTS, END OF PERIOD	123,800	114,540	113,033
Supplemental disclosures of cash flow information:
Income taxes paid, net of refunds	4,996	8,024	11,339
Fixed asset additions in accounts payable and accrued liabilities	$ 596	$ 705	$ 1,620