Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2017	Oct. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 5,659	$ 2,531
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes	230	1,909
Depreciation and amortization	5,386	5,536
Share-based compensation expense	1,983	1,659
Amortization of demo equipment	912	456
Provision for excess and obsolescence inventory	496	392
Excess tax benefit from share-based compensation		(5)
Change in fair value of contingent consideration		64
(Benefit from) provision for doubtful accounts, net of recovery	(145)	48
Loss on sale of property, plant and equipment	217	(3)
Net changes in operating assets and liabilities:
Accounts receivable	4,455	19,995
Inventory	(1,842)	(2,111)
Prepaid expenses and other assets	1,176	139
Accounts payable	(1,195)	2,679
Accrued liabilities	(4,703)	(2,491)
Deferred revenue	714	(791)
Customer deposits	(212)	98
Accrued income taxes and income taxes receivable	1,384	(1,521)
Other liabilities	(365)	(2,061)
NET CASH PROVIDED BY OPERATING ACTIVITIES	14,150	26,523
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(2,353)	(3,282)
Purchases of marketable securities	(44,738)
Proceeds from maturities of marketable securities	2,900
Proceeds from sales of marketable securities	473
Proceeds from the sale of property, plant, and equipment	76	69
NET CASH USED IN INVESTING ACTIVITIES	(43,642)	(3,213)
CASH FLOWS FROM FINANCING ACTIVITIES:
Issuance of stock pursuant to exercise of stock options, employee stock purchase plan, restricted stock plans, and non-employee director stock plan	466	2,336
Repurchase of common stock	(952)
Shares repurchased for taxes for vested employee restricted stock grants	(1,053)	(826)
Excess tax benefit from share-based compensation		5
Dividends paid to shareholders	(1,248)	(1,242)
NET CASH (USED IN) PROVIDED BY FINANCING ACTIVITIES	(2,787)	273
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(213)	(328)
NET (DECREASE) INCREASE IN CASH AND CASH EQUIVALENTS	(32,492)	23,255
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	129,298	118,697
CASH AND CASH EQUIVALENTS, END OF PERIOD	96,806	141,952
Supplemental disclosures of cash flow information:
Non-cash transfer of demonstration inventory to fixed asset	$ 796	$ 1,018