Supplemental Balance Sheet Information (Prepaid Expenses and Other Current Assets) (Details) - USD ($) $ in Millions	Jun. 28, 2020	Sep. 29, 2019
Prepaid Expenses and Other Current Assets [Line Items]
Income tax receivable	$ 429.8	$ 141.1
Other Receivables	214.0	0.0
Other prepaid expenses and current assets	276.5	347.1
Prepaid expenses and other current assets	$ 920.3	$ 488.2