Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Oct. 31, 2016	Oct. 31, 2015
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 2,531	$ 1,376
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes	1,909	(71)
Depreciation and amortization	5,536	5,648
Share-based compensation expense	1,659	2,382
Write down of demo equipment to net realizable value	456	553
Provision for excess and obsolescence inventory	392	62
Excess tax benefit from share-based compensation	(5)	(68)
Change in fair value of contingent consideration	64
Provision for doubtful accounts, net of recovery	48	16
Gain on sale of property, plant and equipment	(3)
Net changes in operating assets and liabilities:
Accounts receivable	19,995	25,401
Inventory	(2,111)	(12,794)
Prepaid expenses and other assets	139	(2,239)
Accounts payable	2,679	2,250
Accrued liabilities	(2,491)	(7,453)
Deferred revenue	(791)	(54)
Customer deposits	98	(12)
Accrued income taxes and income taxes receivable	(1,521)	(1,604)
Other liabilities	(2,061)	298
NET CASH PROVIDED BY OPERATING ACTIVITIES	26,523	13,691
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(3,282)	(2,820)
Proceeds from the sale of property, plant, and equipment	69
NET CASH USED IN INVESTING ACTIVITIES	(3,213)	(2,820)
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	2,336	1,194
Repurchase of common stock		(3,608)
Shares repurchased for taxes for vested employee restricted stock grants	(826)	(618)
Excess tax benefit from share-based compensation	5	68
Dividends paid to shareholders	(1,242)	(1,244)
NET CASH PROVIDED BY (USED IN) FINANCING ACTIVITIES	273	(4,208)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(328)	43
NET INCREASE IN CASH AND CASH EQUIVALENTS	23,255	6,706
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	118,697	123,800
CASH AND CASH EQUIVALENTS, END OF PERIOD	141,952	$ 130,506
Supplemental disclosures of cash flow information:
Non-cash transfer of demonstration inventory to fixed asset	$ 1,018