Basis of Presentation - Leases (Details) - USD ($) $ in Thousands	4 Months Ended		12 Months Ended
	Jan. 19, 2020	Jan. 20, 2019	Sep. 27, 2020	Sep. 30, 2019	Sep. 29, 2019
Lessee, Lease, Description [Line Items]
Operating lease liabilities	$ 926,598
Right-of-use assets	884,213			$ 880,564
Revenues	307,673	$ 290,786
Expenses	237,723	$ 232,462
Assets
Intangible assets, net	37			39	$ 425
Deferred tax assets	66,675			86,570	85,564
Liabilities and Stockholders’ Deficit
Current operating lease liabilities	158,779			159,821
Accrued liabilities	118,289			115,381	120,083
Long-term operating lease liabilities, net of current portion	767,819			770,818
Other long-term liabilities	186,589			221,887	263,770
Retained earnings	$ 1,572,586			1,574,164	$ 1,577,034
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease liabilities				931,000
Right-of-use assets				880,564
Assets
Intangible assets, net				(386)
Deferred tax assets				1,006
Liabilities and Stockholders’ Deficit
Current operating lease liabilities				159,821
Accrued liabilities				(4,702)
Long-term operating lease liabilities, net of current portion				770,818
Other long-term liabilities				(41,883)
Retained earnings				$ (2,870)
Accounting Standards Update 2016-02 | Forecast
Lessee, Lease, Description [Line Items]
Revenues			$ 37,000
Expenses			$ 37,000