Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
Apr. 30, 2015	Apr. 30, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net income	$ 22,608us-gaap_NetIncomeLoss	$ 23,329us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Provision for (benefit from) deferred income taxes	3,271us-gaap_DeferredIncomeTaxExpenseBenefit	(4,224)us-gaap_DeferredIncomeTaxExpenseBenefit
Depreciation and amortization	17,406	16,405
Share-based compensation expense	8,408us-gaap_ShareBasedCompensation	8,727us-gaap_ShareBasedCompensation
Writedown of inventory to net realizable value	3,706us-gaap_InventoryWriteDown	3,111us-gaap_InventoryWriteDown
Provision for doubtful accounts, net of recovery	430	187
Excess tax benefit from share-based compensation	(981)	(3,449)
Change in fair value of contingent consideration	(62)	183
(Gain) loss on sale of property, plant and equipment	(101)	27
Loss on purchase of investment		484us-gaap_GainLossOnSaleOfInvestments
Net changes in operating assets and liabilities, exclusive of acquisition-related assets and liabilities:
Accounts receivable	1,133	18,558
Inventory	(25,680)us-gaap_IncreaseDecreaseInInventories	(6,978)us-gaap_IncreaseDecreaseInInventories
Other current assets	(303)	753
Accounts payable	(497)	7,774
Accrued liabilities	1,532	(10,008)
Deferred revenue	(3,004)	(92)
Customer deposits	827
Accrued income taxes	(5,178)	(10,095)
Other liabilities	2,630	(1,574)
NET CASH PROVIDED BY OPERATING ACTIVITIES	26,145	43,118
CASH FLOWS FROM INVESTING ACTIVITIES:
Additions to property, plant, and equipment	(7,193)	(13,647)
Acquisition of businesses, net of cash acquired	(1,600)	(10,561)
Purchases of marketable securities in Rabbi Trust under the Non-qualified Deferred Compensation Plan	(200)	(624)
Proceeds from the sale of property, plant, and equipment	264	140
NET CASH USED IN INVESTING ACTIVITIES	(8,729)	(24,692)
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	7,417	4,454
Repurchase of common stock	(10,242)	(10,579)
Dividends paid to shareholders	(3,868)us-gaap_PaymentsOfDividends	(3,727)us-gaap_PaymentsOfDividends
Shares repurchased for taxes for vested employee restricted stock grants	(1,731)	(6,281)
Excess tax benefit from share-based compensation	981	3,449
NET CASH USED IN FINANCING ACTIVITIES	(7,443)	(12,684)
EFFECT OF EXCHANGE RATE CHANGES ON CASH	(4,678)	673
NET INCREASE IN CASH AND CASH EQUIVALENTS	5,295	6,415
CASH AND CASH EQUIVALENTS, BEGINNING OF PERIOD	114,540	113,033
CASH AND CASH EQUIVALENTS, END OF PERIOD	$ 119,835	$ 119,448

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-Section 45

-Paragraph 13

-Subparagraph (a),(b)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3213-108585

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- Definition

The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

+ References

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- Definition

The cash inflow associated with the amount received from holders to acquire the entity's shares under incentive and share awards other than stock option exercises. This item inherently excludes any excess tax benefit, which the entity may have realized and reported separately.

+ References

No definition available.

+ Details

Name:	us-gaap_ProceedsFromIssuanceOfSharesUnderIncentiveAndShareBasedCompensationPlans
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- Definition

The cash inflow from the sale of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale.

+ References

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

Name:	us-gaap_ShareBasedCompensation
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