Impairment and other charges, net (Details) $ in Thousands		4 Months Ended			12 Months Ended
		Jan. 21, 2018 USD ($) restaurant		Jan. 22, 2017 USD ($)	Oct. 01, 2017 USD ($) restaurant
Restructuring Cost and Reserve [Line Items]
Costs of closed restaurants and other		$ 1,375		$ 1,839
Restructuring Costs		358		183
Asset Impairment Charges	[1]	291		0
Losses (gains) on the disposition of property and equipment, net		(183)		(530)
Accelerated depreciation		50		102
Impairment and other charges, net		2,257		2,654
Gain (loss) on sale of assets and asset impairment charges		200
Restructuring Reserve		1,866	[2]		$ 2,473
Restructuring Reserve, Accrual Adjustment	[3]	193
Restaurant Closing Costs
Restructuring Cost and Reserve [Line Items]
Other accrued liabilities		2,800
Qdoba Evaluation retention bonus
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		587		0
Qdoba Evaluation consulting costs
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	[4]	226		0
Employee severance and related costs
Restructuring Cost and Reserve [Line Items]
Restructuring Costs	[5]			92
Restructuring Reserve		42			648
Restructuring Reserve, Accrual Adjustment	[6]	(456)
Cash payments		(150)
Other
Restructuring Cost and Reserve [Line Items]
Restructuring Costs		1		91
Facility Closing
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve		5,610	[7],[8]		$ 6,175
Additions		135
Restructuring Reserve, Accrual Adjustment	[9]	347
Cash payments		(1,592)
Facility Closing | Interest Expense
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve, Accrual Adjustment		$ 545
Jack in the box brand restaurant operations | Accelerated depreciation
Restructuring Cost and Reserve [Line Items]
Number of restaurants | restaurant		2
Weighted Average | Facility Closing
Restructuring Cost and Reserve [Line Items]
Remaining Lease Commitment Term		4
Continuing Operations [Member]
Restructuring Cost and Reserve [Line Items]
Losses (gains) on the disposition of property and equipment, net		$ 183		$ 530
Impairment, Disposition, Closing Costs, and Restructuring
Restructuring Cost and Reserve [Line Items]
Gain (loss) on sale of assets and asset impairment charges		$ 500
Number of restaurants closed | restaurant					3

[1] (1)Impairment charges are due primarily to our landlord’s sale of a restaurant property to a franchisee.

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

[3] Adjustments relate to revisions to certain sublease assumptions due to changes in market conditions and includes interest expense.

[4] (1)Qdoba Evaluation consulting costs are primarily related to third party advisory services.

[5] (2)2018 reflects a reduction in severance and related costs due to a change in the number of employees to be terminated in connection with our restructuring activities.

[6] ____________________________(1)Adjustments in accrued severance costs are the result of the change in number of employees to be terminated in connection with our restructuring activities.

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

[8] (3)This balance excludes $2.8 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 upon sale to Jack in the Box franchisees in prior years.

[9] (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