Consolidated Balance Sheets - USD ($) $ in Millions	9 Months Ended
	Jun. 26, 2020	Sep. 27, 2019
Statement of Financial Position [Abstract]
Document Period End Date	Jun. 26, 2020
Current assets:
Cash and cash equivalents	$ 791.3	$ 851.3
Marketable Securities, Current	347.0	203.3
Receivables, net of allowance of $0.9 and $0.8, respectively	346.1	465.3
Inventory	698.2	609.7
Other current assets	154.8	105.0
Total current assets	2,337.4	2,234.6
Property, plant and equipment, net	1,206.9	1,205.6
Operating Lease, Right-of-Use Asset	172.7	0.0
Goodwill	1,189.8	1,189.8
Intangible assets, net	62.9	107.9
Deferred Income Tax Assets, Net	42.6	40.8
Marketable Securities, Noncurrent	24.1	27.6
Other long-term assets	36.0	33.3
Total assets	5,072.4	4,839.6
Current liabilities:
Accounts payable	200.9	190.5
Accrued compensation and benefits	94.6	76.0
Other current liabilities	105.6	107.5
Total current liabilities	401.1	374.0
Long-term tax liabilities	300.6	312.4
Operating Lease, Liability, Noncurrent	155.8	0.0
Other long-term liabilities	32.5	30.9
Total liabilities	890.0	717.3
Stockholders’ equity:
Preferred stock, no par value: 25.0 shares authorized, no shares issued	0.0	0.0
Common stock, $0.25 par value: 525.0 shares authorized; 232.1 shares issued and 167.1 shares outstanding at June 26, 2020, and 230.2 shares issued and 170.1 shares outstanding at September 27, 2019	41.8	42.5
Additional paid-in capital	3,351.5	3,188.0
Treasury stock, at cost	(3,860.3)	(3,412.9)
Retained earnings	4,657.0	4,312.6
Accumulated other comprehensive loss	(7.6)	(7.9)
Total stockholders’ equity	4,182.4	4,122.3
Total liabilities and stockholders’ equity	$ 5,072.4	$ 4,839.6