Consolidated Statements Of Operations (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
Jan. 02, 2015	Dec. 27, 2013
Income Statement [Abstract]
Net revenue	$ 805.5us-gaap_SalesRevenueNet	$ 505.2us-gaap_SalesRevenueNet
Cost of goods sold	432.5us-gaap_CostOfGoodsSold	283.2us-gaap_CostOfGoodsSold
Gross profit	373.0us-gaap_GrossProfit	222.0us-gaap_GrossProfit
Operating expenses:
Research and development	68.5us-gaap_ResearchAndDevelopmentExpense	58.4us-gaap_ResearchAndDevelopmentExpense
Selling, general and administrative	47.9	41.1
Amortization of intangibles	8.5us-gaap_AmortizationOfIntangibleAssets	6.5us-gaap_AmortizationOfIntangibleAssets
Restructuring and other charges	1.3us-gaap_RestructuringCharges	0us-gaap_RestructuringCharges
Total operating expenses	126.2us-gaap_OperatingExpenses	106.0us-gaap_OperatingExpenses
Operating income	246.8us-gaap_OperatingIncomeLoss	116.0us-gaap_OperatingIncomeLoss
Other income, net	0.7us-gaap_OtherNonoperatingIncomeExpense	0us-gaap_OtherNonoperatingIncomeExpense
Income before income taxes	247.5	116.0
Provision for income taxes	52.3us-gaap_IncomeTaxExpenseBenefit	21.5us-gaap_IncomeTaxExpenseBenefit
Net income	$ 195.2us-gaap_NetIncomeLoss	$ 94.5us-gaap_NetIncomeLoss
Earnings per share:
Basic (in dollars per share)	$ 1.03us-gaap_EarningsPerShareBasic	$ 0.51us-gaap_EarningsPerShareBasic
Diluted (in dollars per share)	$ 1.01us-gaap_EarningsPerShareDiluted	$ 0.49us-gaap_EarningsPerShareDiluted
Weighted average shares:
Basic (in shares)	188.7	186.2
Diluted (in shares)	194.2	191.2
Cash dividends declared and paid per share	$ 0.13	$ 0.00

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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