Consolidated Statements Of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Jan. 01, 2021	Dec. 27, 2019
Statement of Cash Flows [Abstract]
Document Period End Date	Jan. 01, 2021
Net income	$ 509,300	$ 257,100
Adjustments to reconcile net income to net cash provided by operating activities:
Share-based compensation	44,500	33,600
Depreciation	78,400	79,800
Amortization of intangible assets	8,000	11,400
Other, net	(700)	900
Changes in assets and liabilities:
Receivables, net	(296,300)	38,500
Inventory	88,900	7,900
Accounts payable	22,400	(6,700)
Other current and long-term assets and liabilities	30,600	(24,100)
Net Cash Provided by (Used in) Operating Activities	485,100	398,400
Cash flows from investing activities:
Payments to Acquire Property, Plant, and Equipment	118,900	111,200
Payments to Acquire Marketable Securities	(99,400)	(131,500)
Payments to Acquire Intangible Assets	4,300	0
Proceeds from Sale and Maturity of Debt Securities, Available-for-sale	111,600	62,200
Net Cash Provided by (Used in) Investing Activities	(111,000)	(180,500)
Cash flows from financing activities:
Repurchase of common stock - payroll tax withholdings on equity awards	(47,700)	(26,600)
Repurchase of common stock - stock repurchase program	(195,600)	(74,200)
Dividends paid	(83,000)	(75,100)
Net proceeds from exercise of stock options	2,700	34,900
Net Cash Provided by (Used in) Financing Activities	(323,600)	(141,000)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents, Period Increase (Decrease), Including Exchange Rate Effect	50,500	76,900
Cash and cash equivalents at beginning of period	566,700	851,300
Cash and cash equivalents at end of period	617,200	928,200
Supplemental cash flow disclosures:
Income taxes paid	8,100	26,100
Stock Issued	27,500	0
Capital Expenditures Incurred but Not yet Paid	94,300	70,100
Right-of-Use Asset Obtained in Exchange for Operating Lease Liability	$ 12,500	$ 20,700