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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) |  |  |  |  |  |  |  |  |  |  |

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