Nature of Operations and Summary of Significant Accounting Policies (Effect of New Accounting Pronouncements) (Details) - USD ($) $ in Thousands		3 Months Ended						4 Months Ended		12 Months Ended
	Sep. 30, 2019	Sep. 27, 2020	Jul. 05, 2020	Apr. 12, 2020	Sep. 29, 2019	Jul. 07, 2019	Apr. 14, 2019	Jan. 19, 2020	Jan. 20, 2019	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets	$ 880,564	$ 904,548			$ 0					$ 904,548	$ 0
Operating lease liabilities		955,094								955,094
Adjustment for straight-line rent accruals	29,000
Unfavorable lease liabilities	2,100
Exit-related lease liabilities	19,400
Favorable lease assets	400
Cumulative adjustment to opening retained earnings	(2,900)
Revenues		255,401	$ 242,275	$ 216,157	221,235	$ 222,359	$ 215,727	$ 307,673	$ 290,786	1,021,506	950,107	$ 869,690
Expenses										790,922	747,884	$ 636,243
Assets
Intangible assets, net	39	277			425					277	425
Deferred tax assets	86,570	72,322			85,564					72,322	85,564
Liabilities and Stockholders’ Deficit
Current operating lease liabilities	159,821	179,000			0					179,000	0
Accrued liabilities	115,381	129,431			120,083					129,431	120,083
Long-term operating lease liabilities, net of current portion	770,818	776,094			0					776,094	0
Other long-term liabilities	221,887	206,494			263,770					206,494	263,770
Retained earnings	1,574,164	$ 1,636,211			$ 1,577,034					1,636,211	$ 1,577,034
Accounting Standards Update 2016-02
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Right-of-use assets	880,564
Operating lease liabilities	931,000
Revenues										37,400
Expenses										$ 37,400
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)