Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended	6 Months Ended
Apr. 03, 2015	Mar. 28, 2014	Apr. 03, 2015	Mar. 28, 2014
Income Statement [Abstract]
Net revenue	$ 762.1us-gaap_SalesRevenueNet	$ 481.0us-gaap_SalesRevenueNet	$ 1,567.6us-gaap_SalesRevenueNet	$ 986.2us-gaap_SalesRevenueNet
Cost of goods sold	409.9us-gaap_CostOfGoodsSold	268.6us-gaap_CostOfGoodsSold	842.4us-gaap_CostOfGoodsSold	551.8us-gaap_CostOfGoodsSold
Gross profit	352.2us-gaap_GrossProfit	212.4us-gaap_GrossProfit	725.2us-gaap_GrossProfit	434.4us-gaap_GrossProfit
Operating expenses:
Research and development	75.5us-gaap_ResearchAndDevelopmentExpense	61.6us-gaap_ResearchAndDevelopmentExpense	144.0us-gaap_ResearchAndDevelopmentExpense	120.0us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	47.4	41.9	95.3	83.0
Amortization of intangibles	8.3us-gaap_AmortizationOfIntangibleAssets	6.3us-gaap_AmortizationOfIntangibleAssets	16.8us-gaap_AmortizationOfIntangibleAssets	12.8us-gaap_AmortizationOfIntangibleAssets
Restructuring and other charges	1.1us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges	2.4us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Total operating expenses	132.3us-gaap_OperatingExpenses	109.8us-gaap_OperatingExpenses	258.5us-gaap_OperatingExpenses	215.8us-gaap_OperatingExpenses
Operating income	219.9us-gaap_OperatingIncomeLoss	102.6us-gaap_OperatingIncomeLoss	466.7us-gaap_OperatingIncomeLoss	218.6us-gaap_OperatingIncomeLoss
Other income (expense), net	0.6us-gaap_OtherNonoperatingIncomeExpense	(0.1)us-gaap_OtherNonoperatingIncomeExpense	1.3us-gaap_OtherNonoperatingIncomeExpense	(0.1)us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	220.5	102.5	468.0	218.5
Provision for income taxes	54.0us-gaap_IncomeTaxExpenseBenefit	25.6us-gaap_IncomeTaxExpenseBenefit	106.3us-gaap_IncomeTaxExpenseBenefit	47.1us-gaap_IncomeTaxExpenseBenefit
Net income	$ 166.5us-gaap_NetIncomeLoss	$ 76.9us-gaap_NetIncomeLoss	$ 361.7us-gaap_NetIncomeLoss	$ 171.4us-gaap_NetIncomeLoss
Earnings per share:
Basic (in dollars per share)	$ 0.88us-gaap_EarningsPerShareBasic	$ 0.41us-gaap_EarningsPerShareBasic	$ 1.91us-gaap_EarningsPerShareBasic	$ 0.92us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 0.85us-gaap_EarningsPerShareDiluted	$ 0.40us-gaap_EarningsPerShareDiluted	$ 1.86us-gaap_EarningsPerShareDiluted	$ 0.89us-gaap_EarningsPerShareDiluted
Weighted average shares:
Basic (in shares)	189.9	187.4	189.3	186.8
Diluted (in shares)	195.2	192.2	194.7	191.7
Cash dividends declared and paid per share (usd per share)	$ 0.13	$ 0	$ 0.26	$ 0

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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