Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands	12 Months Ended
	Oct. 02, 2020	Sep. 28, 2019	Sep. 27, 2019
Significant Accounting Policies [Line Items]
Operating lease right-of-use assets	$ 576,915	$ 767,000	$ 0
Reclassifications of previously recorded lease incentives and deferred rent		82,300
Restructured lease cease-use liabilities		141,400
Operating lease liability	164,312	180,700	0
Long-term operating lease liability	$ 735,202	$ 810,100	$ 0
Minimum
Significant Accounting Policies [Line Items]
Term of lease contract	1 year
Minimum | Buildings
Significant Accounting Policies [Line Items]
Estimated useful life of assets	20 years
Minimum | Equipment
Significant Accounting Policies [Line Items]
Estimated useful life of assets	3 years
Minimum | Leasehold improvements
Significant Accounting Policies [Line Items]
Estimated useful life of assets	4 years
Maximum
Significant Accounting Policies [Line Items]
Term of lease contract	13 years
Maximum | Buildings
Significant Accounting Policies [Line Items]
Estimated useful life of assets	40 years
Maximum | Equipment
Significant Accounting Policies [Line Items]
Estimated useful life of assets	10 years
Maximum | Leasehold improvements
Significant Accounting Policies [Line Items]
Estimated useful life of assets	10 years