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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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Amount of obligation to transfer good or service to customer for which consideration has been received or is receivable.

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