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Nature Of Operations And Summary Of Significant Accounting Policies (Summary of New Accounting Standard Impact) (Details) - USD ($) $ in Thousands | 3 Months Ended | 4 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2018 | Jul. 08, 2018 | Apr. 15, 2018 | Oct. 01, 2017 | Jul. 09, 2017 | Apr. 16, 2017 | Jan. 21, 2018 | Jan. 22, 2017 | Sep. 30, 2018 | Oct. 01, 2017 | Oct. 02, 2016 | Oct. 01, 2018
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues | $ 177,472 | $ 187,983 | $ 209,772 | $ 232,125 | $ 246,101 | $ 265,884 | $ 294,463 | $ 353,181 | $ 869,690 | $ 1,097,291 | $ 1,162,258 |
Franchise Fees |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 4,867 | 4,291 |  |
Accounting Standards Update 2014-09 | Franchise fees recognized under the current accounting standard | Franchise Fees |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | 6,416 | 8,042 |  |
Accounting Standards Update 2014-09 | Net impact on revenue from franchise fees | Franchise Fees |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Revenues |  |  |  |  |  |  |  |  | $ (1,549) | $ (3,751) |  |
Subsequent Event [Member] | Accounting Standards Update 2014-09 | Net impact on revenue from franchise fees |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Contract with Customer, Liability |  |  |  |  |  |  |  |  |  |  |  | $ 50,000

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