Impairment, Disposition Of Property And Equipment, And Restaurant Closing Costs (Restaurant Closing Costs) (Details) $ in Thousands		6 Months Ended	12 Months Ended
		Apr. 15, 2018 USD ($)	Sep. 30, 2018 USD ($) restaurant		Oct. 01, 2017 USD ($)	Oct. 02, 2016 USD ($)
Restructuring Cost and Reserve [Line Items]
Impairment of Long-Lived Assets Held-for-use		$ 800
Restructuring Reserve [Roll Forward]
Asset Impairment Charges	[1]		$ 211		$ 0	$ 0
Gain (Loss) on Sale of Assets and Asset Impairment Charges			200
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of year		$ 6,175	6,175
Restructuring Reserve, Accrual Adjustment	[2]		675
Additions and adjustments			1,639
Cash payments			(5,090)
Balance at end of year			3,534	[3],[4]	$ 6,175
Restaurant Closing Costs [Member]
Restructuring Reserve [Roll Forward]
Other Accrued Liabilities			$ 2,300
Weighted Average [Member] | Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
RemainingLeaseCommitmentTerm			4
Interest Expense [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment			$ 135
Property, Plant and Equipment [Member]
Restructuring Reserve [Roll Forward]
Restructuring Costs and Asset Impairment Charges			500
Commitments [Member]
Restructuring Reserve [Roll Forward]
Restructuring Costs and Asset Impairment Charges			$ 500
Franchised Units [Member] | Impairment, Disposition, Closing Costs, and Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Number of Restaurants Closed | restaurant			10
Entity Operated Units [Member] | Impairment, Disposition, Closing Costs, and Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Number of Restaurants Closed | restaurant			1

[1] (1)In 2018, impairment charges relate to our landlord’s sale of a restaurant property to a franchisee.

[2] (1)Adjustments relate primarily to revisions of certain sublease and cost assumptions. Our estimates related to our future lease obligations, primarily the sublease income we anticipate, are subject to a high degree of judgment and may differ from actual sublease income due to changes in economic conditions, desirability of the sites, and other factors.

[3] (3)This balance excludes $2.3 million of restaurant closing costs that are included in accrued liabilities and other long-term liabilities, which were initially recorded as losses on the sale of company-operated restaurants to franchisees in prior years.

[4] The weighted-average remaining lease term related to these commitments is approximately four years