Impairment and other charges, net Cost of closed restaurants (Details) $ in Thousands	9 Months Ended
	Jul. 07, 2019 USD ($)
Facility Closing [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve	$ 3,534
Restructuring Charges	0
Restructuring Reserve, Accrual Adjustment	572	[1]
Payments for Restructuring	(3,156)
Restructuring Reserve	2,044	[2],[3]
Facility Closing [Member] | Interest Expense [Member]
Restructuring Reserve [Roll Forward]
Restructuring Reserve, Accrual Adjustment	1,094
Restaurant Closing Costs [Member]
Restructuring Reserve [Roll Forward]
Other Accrued Liabilities	$ 1,700
Weighted Average [Member] | Facility Closing [Member]
Restructuring Reserve [Roll Forward]
RemainingLeaseCommitmentTerm	4 years

[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.

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

[3] This balance excludes $1.7 million of restaurant closing costs that are included in “Accrued liabilities” and “Other long-term liabilities” on our condensed consolidated balance sheets, which were initially recorded as losses on the sale of company-operated restaurants to franchisees.