Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jan. 31, 2017	Jan. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income (loss)	$ 10,046	$ (1,609)
Adjustments to reconcile net income (loss) to net cash provided by operating activities:
Benefit from deferred income taxes	(194)	(2,319)
Depreciation and amortization	12,871	11,281
Asset impairment charges	10,423
Share-based compensation expense	4,255	4,209
Write down of demo equipment to net realizable value	969	1,319
Provision for excess and obsolescence inventory	1,329	624
Excess tax benefit from share-based compensation	(158)	(220)
Change in fair value of contingent consideration	(8,103)
Provision for doubtful accounts, net of recovery	20	(32)
Gain (loss) on sale of property, plant and equipment	36	(12)
Net changes in operating assets and liabilities:
Accounts receivable	20,223	22,945
Inventory	(4,180)	(20,074)
Prepaid expenses and other assets	641	(1,720)
Accounts payable	1,207	(1,394)
Accrued liabilities	(5,699)	9,866
Deferred revenue	(977)	(686)
Customer deposits	720	11
Accrued income taxes and income taxes receivable	(1,120)	(3,566)
Other liabilities	(1,552)	226
NET CASH PROVIDED BY OPERATING ACTIVITIES	40,757	18,849
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(5,743)	(4,521)
Acquisition of businesses, net of cash acquired		(8,048)
Proceeds from the sale of property, plant, and equipment	18	60
NET CASH USED IN INVESTING ACTIVITIES	(5,725)	(12,509)
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	3,090	2,294
Repurchase of common stock		(7,236)
Shares repurchased for taxes for vested employee restricted stock grants	(1,039)	(1,708)
Excess tax benefit from share-based compensation	158	220
Dividends paid to shareholders	(2,501)	(2,487)
Cash paid for financing cost		(458)
NET CASH USED IN FINANCING ACTIVITIES	(292)	(9,375)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(447)	(698)
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	34,293	(3,733)
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	118,697	123,800
CASH AND CASH EQUIVALENTS, END OF PERIOD	152,990	$ 120,067
Supplemental disclosures of cash flow information:
Non-cash transfer of demonstration inventory to fixed asset	$ 1,764