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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Mar. 28, 2015	Mar. 29, 2014	Mar. 28, 2015	Mar. 29, 2014
Income Statement [Abstract]
Net revenue	$ 145,227us-gaap_SalesRevenueNet	$ 114,206us-gaap_SalesRevenueNet	$ 252,665us-gaap_SalesRevenueNet	$ 193,319us-gaap_SalesRevenueNet
Cost of sales	76,657us-gaap_CostOfGoodsAndServicesSold	56,534us-gaap_CostOfGoodsAndServicesSold	129,361us-gaap_CostOfGoodsAndServicesSold	97,282us-gaap_CostOfGoodsAndServicesSold
Gross profit	68,570us-gaap_GrossProfit	57,672us-gaap_GrossProfit	123,304us-gaap_GrossProfit	96,037us-gaap_GrossProfit
Selling, general and administrative	35,607us-gaap_SellingGeneralAndAdministrativeExpense	28,235us-gaap_SellingGeneralAndAdministrativeExpense	61,034us-gaap_SellingGeneralAndAdministrativeExpense	51,337us-gaap_SellingGeneralAndAdministrativeExpense
Research and development	23,172us-gaap_ResearchAndDevelopmentExpense	19,326us-gaap_ResearchAndDevelopmentExpense	42,753us-gaap_ResearchAndDevelopmentExpense	36,797us-gaap_ResearchAndDevelopmentExpense
Operating expenses	58,779us-gaap_OperatingExpenses	47,561us-gaap_OperatingExpenses	103,787us-gaap_OperatingExpenses	88,134us-gaap_OperatingExpenses
Income from operations	9,791us-gaap_OperatingIncomeLoss	10,111us-gaap_OperatingIncomeLoss	19,517us-gaap_OperatingIncomeLoss	7,903us-gaap_OperatingIncomeLoss
Interest income	453us-gaap_InvestmentIncomeInterest	343us-gaap_InvestmentIncomeInterest	715us-gaap_InvestmentIncomeInterest	622us-gaap_InvestmentIncomeInterest
Interest expense	(316)us-gaap_InterestExpense	(297)us-gaap_InterestExpense	(619)us-gaap_InterestExpense	(416)us-gaap_InterestExpense
Income from operations before income taxes	9,928us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	10,157us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	19,613us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	8,109us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision for income taxes	1,997us-gaap_IncomeTaxExpenseBenefit	1,087us-gaap_IncomeTaxExpenseBenefit	3,840us-gaap_IncomeTaxExpenseBenefit	996us-gaap_IncomeTaxExpenseBenefit
Net income	$ 7,931us-gaap_NetIncomeLoss	$ 9,070us-gaap_NetIncomeLoss	$ 15,773us-gaap_NetIncomeLoss	$ 7,113us-gaap_NetIncomeLoss
Net income per share:
Basic (in dollars per share)	$ 0.10us-gaap_EarningsPerShareBasic	$ 0.12us-gaap_EarningsPerShareBasic	$ 0.21us-gaap_EarningsPerShareBasic	$ 0.09us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.10us-gaap_EarningsPerShareDiluted	$ 0.12us-gaap_EarningsPerShareDiluted	$ 0.20us-gaap_EarningsPerShareDiluted	$ 0.09us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (in shares)	76,821us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,404us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,855us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	76,163us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	77,570us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	77,021us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	77,488us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	76,777us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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