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Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	9 Months Ended
	Feb. 28, 2015	Feb. 28, 2014
CASH FLOWS FROM OPERATING ACTIVITIES:
Net Income	$ 24,143us-gaap_ProfitLoss	$ 20,478us-gaap_ProfitLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,852us-gaap_DepreciationDepletionAndAmortization	6,641us-gaap_DepreciationDepletionAndAmortization
Share based compensation	3,187us-gaap_ShareBasedCompensation	2,689us-gaap_ShareBasedCompensation
Excess income tax benefit from the exercise of stock options	(1,672)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities	(3,948)us-gaap_ExcessTaxBenefitFromShareBasedCompensationOperatingActivities
Changes in operating assets and liabilities, net of business acquisitions:
Accounts receivable	(884)us-gaap_IncreaseDecreaseInAccountsReceivable	(6,789)us-gaap_IncreaseDecreaseInAccountsReceivable
Inventories	(3,171)us-gaap_IncreaseDecreaseInInventories	(4,060)us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other current assets	1,956us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets	(963)us-gaap_IncreaseDecreaseInPrepaidDeferredExpenseAndOtherAssets
Accounts payable, accruals and other	2,060us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities	3,114us-gaap_IncreaseDecreaseInAccountsPayableAndAccruedLiabilities
NET CASH PROVIDED BY OPERATING ACTIVITIES	33,471us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations	17,162us-gaap_NetCashProvidedByUsedInOperatingActivitiesContinuingOperations
CASH FLOWS FROM INVESTING ACTIVITIES:
Purchases of property and equipment and other assets	(6,861)us-gaap_PaymentsToAcquireProductiveAssets	(7,347)us-gaap_PaymentsToAcquireProductiveAssets
Proceeds from the sale of marketable securities	67,419us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities	76,996us-gaap_ProceedsFromSaleAndMaturityOfMarketableSecurities
Purchases of marketable securities	(76,262)us-gaap_PaymentsToAcquireMarketableSecurities	(67,192)us-gaap_PaymentsToAcquireMarketableSecurities
Payments for businesses	(6,554)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired	(39,265)us-gaap_PaymentsToAcquireBusinessesNetOfCashAcquired
NET CASH USED IN INVESTING ACTIVITIES	(22,258)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations	(36,808)us-gaap_NetCashProvidedByUsedInInvestingActivitiesContinuingOperations
CASH FLOWS FROM FINANCING ACTIVITIES:
Increase (decrease) in other long-term liabilities	0us-gaap_ProceedsFromRepaymentsOfOtherLongTermDebt	168us-gaap_ProceedsFromRepaymentsOfOtherLongTermDebt
Net proceeds from issuance of common stock	4,809us-gaap_ProceedsFromIssuanceOfCommonStock	8,112us-gaap_ProceedsFromIssuanceOfCommonStock
Excess income tax benefit from the exercise of stock options	1,672us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities	3,948us-gaap_ExcessTaxBenefitFromShareBasedCompensationFinancingActivities
NET CASH PROVIDED BY FINANCING ACTIVITIES	6,481us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations	12,228us-gaap_NetCashProvidedByUsedInFinancingActivitiesContinuingOperations
EFFECT OF EXCHANGE RATE ON CASH	(885)us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents	662us-gaap_EffectOfExchangeRateOnCashAndCashEquivalents
NET INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	16,809us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease	(6,756)us-gaap_CashAndCashEquivalentsPeriodIncreaseDecrease
CASH AND CASH EQUIVALENTS AT BEGINNING OF PERIOD	40,675us-gaap_CashAndCashEquivalentsAtCarryingValue	50,032us-gaap_CashAndCashEquivalentsAtCarryingValue
CASH AND CASH EQUIVALENTS AT END OF PERIOD	$ 57,484us-gaap_CashAndCashEquivalentsAtCarryingValue	$ 43,277us-gaap_CashAndCashEquivalentsAtCarryingValue

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