Consolidated Statements of Cash Flows - USD ($) $ in Thousands	9 Months Ended
	Apr. 30, 2017	Apr. 30, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:
Net (loss) income	$ (49,618)	$ 3,361
Adjustments to reconcile net income to net cash provided by operating activities:
Benefit from deferred income taxes	(8,402)	(2,681)
Depreciation and amortization	19,221	17,157
Asset impairment charges	83,474
Share-based compensation expense	6,450	7,144
Write down of demo equipment to net realizable value	1,557	2,496
Provision for excess and obsolescence inventory	287	775
Excess tax benefit from share-based compensation	(158)	(300)
Change in fair value of contingent consideration	(10,238)
Provision for doubtful accounts, net of recovery	88	67
(Gain) loss on sale of property, plant and equipment	(57)
Net changes in operating assets and liabilities:
Accounts receivable	18,295	23,518
Inventory	(5,547)	(24,160)
Prepaid expenses and other assets	596	(2,194)
Accounts payable	608	2,006
Accrued liabilities	(2,845)	11,573
Deferred revenue	(641)	(743)
Customer deposits	554	(85)
Accrued income taxes and income taxes receivable	1,174	(3,839)
Other liabilities	(1,423)	796
Cash paid for contingent consideration	100
NET CASH PROVIDED BY OPERATING ACTIVITIES	53,275	34,891
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(7,741)	(9,664)
Acquisition of businesses, net of cash acquired		(8,026)
Proceeds from the sale of property, plant, and equipment	30	66
NET CASH USED IN INVESTING ACTIVITIES	(7,711)	(17,624)
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	3,397
Repurchase of common stock	(1,584)	(11,793)
Shares repurchased for taxes for vested employee restricted stock grants	(1,128)	(1,774)
Excess tax benefit from share-based compensation	158	300
Dividends paid to shareholders	(3,771)	(3,726)
Cash paid for financing cost		(499)
Contingent consideration paid for business acquisitions	(1,900)
NET CASH USED IN FINANCING ACTIVITIES	(5,135)	(14,095)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(493)	1,152
NET INCREASE IN CASH AND CASH EQUIVALENTS	39,936	4,324
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	118,697	123,800
CASH AND CASH EQUIVALENTS, END OF PERIOD	158,633	$ 128,124
Supplemental disclosures of cash flow information:
Non-cash transfer of demonstration inventory to fixed asset	$ 3,506