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CONSOLIDATED STATEMENTS OF OPERATIONS (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended
	Dec. 27, 2014	Dec. 28, 2013
Income Statement [Abstract]
Net revenue	$ 107,438us-gaap_SalesRevenueNet	$ 79,113us-gaap_SalesRevenueNet
Cost of sales	52,704us-gaap_CostOfGoodsAndServicesSold	40,748us-gaap_CostOfGoodsAndServicesSold
Gross profit	54,734us-gaap_GrossProfit	38,365us-gaap_GrossProfit
Selling, general and administrative	25,427us-gaap_SellingGeneralAndAdministrativeExpense	23,102us-gaap_SellingGeneralAndAdministrativeExpense
Research and development	19,581us-gaap_ResearchAndDevelopmentExpense	17,471us-gaap_ResearchAndDevelopmentExpense
Operating expenses	45,008us-gaap_OperatingExpenses	40,573us-gaap_OperatingExpenses
Income / (loss) from operations	9,726us-gaap_OperatingIncomeLoss	(2,208)us-gaap_OperatingIncomeLoss
Interest income	262us-gaap_InvestmentIncomeInterest	279us-gaap_InvestmentIncomeInterest
Interest expense	(303)us-gaap_InterestExpense	(119)us-gaap_InterestExpense
Income / (loss) from operations before income taxes	9,685us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest	(2,048)us-gaap_IncomeLossFromContinuingOperationsBeforeIncomeTaxesExtraordinaryItemsNoncontrollingInterest
Provision (benefit) for income taxes	1,843us-gaap_IncomeTaxExpenseBenefit	(91)us-gaap_IncomeTaxExpenseBenefit
Net income / (loss)	$ 7,842us-gaap_NetIncomeLoss	$ (1,957)us-gaap_NetIncomeLoss
Net income per share:
Basic (in dollars per share)	$ 0.10us-gaap_EarningsPerShareBasic	$ (0.03)us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.10us-gaap_EarningsPerShareDiluted	$ (0.03)us-gaap_EarningsPerShareDiluted
Weighted average shares outstanding:
Basic (in shares)	76,888us-gaap_WeightedAverageNumberOfSharesOutstandingBasic	75,912us-gaap_WeightedAverageNumberOfSharesOutstandingBasic
Diluted (in shares)	77,432us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding	75,912us-gaap_WeightedAverageNumberOfDilutedSharesOutstanding

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The aggregate costs related to goods produced and sold and services rendered by an entity during the reporting period. This excludes costs incurred during the reporting period related to financial services rendered and other revenue generating activities.

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The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use.

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