Consolidated Statements Of Cash Flows - USD ($) $ in Millions	6 Months Ended
	Mar. 27, 2020	Mar. 29, 2019
Statement of Cash Flows [Abstract]
Document Period End Date	Mar. 27, 2020
Net income	$ 438.1	$ 498.8
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	73.8	42.6
Depreciation	160.3	156.4
Amortization of intangible assets, including inventory step-up	22.7	28.6
Deferred income taxes	1.1	(27.6)
Other, net	2.1	0.8
Changes in assets and liabilities:
Receivables, net	97.7	112.0
Inventory	(37.0)	(66.9)
Accounts payable	(13.2)	(23.9)
Other current and long-term assets and liabilities	(66.8)	20.3
Net Cash Provided by (Used in) Operating Activities	678.8	741.1
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	171.9	226.2
Payments to Acquire Marketable Securities	(178.8)	(166.7)
Payments to Acquire Intangible Assets	0.2	12.9
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	214.4	309.2
Net Cash Provided by (Used in) Investing Activities	(136.5)	(96.6)
Cash flows from financing activities:
Repurchase of common stock - payroll tax withholdings on equity awards	(28.7)	(21.0)
Repurchase of common stock - stock repurchase program	(358.0)	(425.5)
Dividends paid	(150.0)	(133.1)
Net proceeds from exercise of stock options	43.3	6.8
Proceeds from Issuance of Common Stock	12.2	11.3
Net Cash Provided by (Used in) Financing Activities	(481.2)	(561.5)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	61.1	83.0
Cash and cash equivalents at beginning of period	851.3	733.3
Cash and cash equivalents at end of period	912.4	816.3
Supplemental cash flow disclosures:
Income taxes paid	81.1	87.5
Capital Expenditures Incurred but Not yet Paid	$ 95.4	$ 69.9