Consolidated Statements Of Cash Flows - USD ($) $ in Millions	3 Months Ended
	Dec. 28, 2018	Dec. 29, 2017
Cash flows from operating activities:
Net income	$ 284.9	$ 70.4
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	20.8	25.8
Depreciation	77.5	63.6
Amortization of intangible assets, including inventory step-up	15.5	5.5
Deferred income taxes	1.8	21.4
Other, net	1.0	0.0
Changes in assets and liabilities:
Receivables, net	131.4	(4.1)
Inventory	(5.0)	34.5
Other current and long-term assets	(2.6)	(20.6)
Accounts payable	(22.2)	(105.4)
Other current and long-term liabilities	45.9	269.7
Net cash provided by operating activities	549.0	360.8
Cash flows from investing activities:
Capital expenditures	(129.5)	(28.2)
Payments for Software	0.0	(6.0)
Payments to Acquire Marketable Securities	(2.2)	0.0
Maturity of investments	303.2	0.0
Net cash provided by (used in) investing activities	171.5	(34.2)
Cash flows from financing activities:
Repurchase of common stock - payroll tax withholdings on equity awards	(19.4)	(44.7)
Repurchase of common stock - stock repurchase program	(284.0)	(172.5)
Dividends paid	(67.1)	(59.1)
Net proceeds from exercise of stock options	2.4	14.4
Net cash used in financing activities	(368.1)	(261.9)
Net increase in cash and cash equivalents	352.4	64.7
Cash and cash equivalents at beginning of period	733.3	1,616.8
Cash and cash equivalents at end of period	1,085.7	1,681.5
Supplemental cash flow disclosures:
Income taxes paid	$ 1.6	$ 7.2